cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Evolutionary link between globular clusters and circumgalactic clouds
Creators: name: Acharova, I. A.
name: Sharina, M. E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The established by us possibility to consider circumgalactic clouds (CGCs) as the remnants of the parent clouds in which globular clusters (GCs) have been formed (Acharova & Sharina 2018) is based on a comparison of the following facts. First, the metallicities of CGCs at redshifts $ z <1 $ and of GCs in our and other galaxies show a bimodal distribution with a minimum near $\rm [Mg/H]=-1$. Mean values and standard deviations of the Mg abundances in GCs and CGCs with $\rm [Mg/H] -1$ coincide within the typical error of measuring the elemental abundances in clouds: 0.3 dex (Acharova & Sharina 2018). Second, a similar coincidence is observed for GCs and CGCs with $\rm [X/H] -1$ at redshifts $ 2
description: 4 pages, 1 figure, 2 tables, to be published in the proceedings of the conference 'Ground-Based Astronomy in Russia. 21st Century', Nizhny Arkhyz, Russia, 21-25 Sep 2020
Axisymmetric oscillations of magnetic neutron stars
Creators: name: Lee, Umin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We calculate axisymmetric oscillations of rotating neutron stars composed of the surface fluid ocean, solid crust, and fluid core, taking account of a dipole magnetic field as strong as $B_S\sim 10^{15}$G at the surface. The adiabatic oscillation equations for the solid crust threaded by a dipole magnetic field are derived in Newtonian dynamics, on the assumption that the axis of rotation is aligned with the magnetic axis so that perturbations on the equilibrium can be represented by series expansions in terms of spherical harmonic functions $Y_l^m(θ,ϕ)$ with different degrees $l$ for a given azimuthal wave number $m$ around the the magnetic axis. Although the three component models can support a rich variety of oscillation modes, axisymmetric ($m=0$) toroidal $_{l}t_n$ and spheroidal $_ls_n$ shear waves propagating in the solid crust are our main concerns, where $l$ and $n$ denote the harmonic degree and the radial order of the modes, respectively. In the absence of rotation, axisymmetric spheroidal and toroidal modes are completely decoupled, and we consider the effects of rotation on the oscillation modes only in the limit of slow rotation. We find that the oscillation frequencies of the fundamental toroidal torsional modes $_{l}t_n$ in the crust are hardly affected by the magnetic field as strong as $B_S\sim 10^{15}$G at the surface. As the radial order $n$ of the shear modes in the crust becomes higher, however, both spheroidal and toroidal modes become susceptible to the magnetic field and their frequencies in general get higher with increasing $B_S$. We also find that the surface $g$ modes and the crust/ocean interfacial modes are suppressed by a strong magnetic field, and that there appear magnetic modes in the presence of a strong magnetic field.
description: submitted to monthly notices
Readout methods and devices for Josephson-junction-based solid-state qubits
Creators: name: Johansson, G.
name: Tornberg, L.
name: Shumeiko, V. S.
name: Wendin, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We discuss the current situation concerning measurement and readout of Josephson-junction based qubits. In particular we focus attention of dispersive low-dissipation techniques involving reflection of radiation from an oscillator circuit coupled to a qubit, allowing single-shot determination of the state of the qubit. In particular we develop a formalism describing a charge qubit read out by measuring its effective (quantum) capacitance. To exemplify, we also give explicit formulas for the readout time.
description: 20 pages, 7 figures. To be published in J. Phys.: Condensed Matter, 18 (2006) Special issue: Quantum computing
The Third Data Release of the KODIAQ Survey
Creators: name: O'Meara, John M.
name: Lehner, Nicolas
name: Howk, J. Christopher
name: Prochaska, J. Xavier
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present and make publicly available the third data release (DR3) of the Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ) survey. KODIAQ DR3 consists of a fully-reduced sample of 727 quasars at 0.1 < z < 6.4 observed with ESI at moderate resolution (4000 < R < 10000). DR3 contains 872 spectra available in flux calibrated form, representing a sum total exposure time of approximately 2.8 megaseconds. These co-added spectra arise from a total of 2753 individual exposures of quasars taken from the Keck Observatory Archive (KOA) in raw form and uniformly processed using a data reduction package made available through the XIDL distribution. DR3 is publicly available to the community, housed as a higher level science product at the KOA and in the igmspec database.
description: 25 pages, 8 figures, 2 tables. Accepted for publication in the Astronomical Journal
Nonhermitian Supersymmetric Partition Functions: the case of one bosonic flavor
Creators: name: Splittorff, K.
name: Verbaarschot, J. J. M.
name: Zirnbauer, M. R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the supersymmetric formulation of the nonhermitian $β= 2$ random matrix partition function with one bosonic flavor. This partition function is regularized by adding one conjugate boson and fermion each. A supersymmetric nonlinear $σ$-model for the resulting Goldstone degrees of freedom is obtained using symmetry arguments only. For a Gaussian probability distribution the same results are derived using superbosonization and the complex orthogonal polynomial method. The symmetry arguments apply to any model with the same symmetries and a mass gap, and demonstrate the universality of the nonlinear $σ$-model.
description: 17 pages, 0 figures. Section II extended. Version to appear in Nucl.Phys.B
Data and Software Citation at AGU
Creators: name: Vrouwenvelder, Kristina
Publisher: name: Zenodo
Year: 2023
Subjects: data citation
software citation
data sharing
software sharing
publishing

description: Presentation given at the Open Science and Data Help Desk at AGU 2023 in San Francisco. 

Tuesday, 12 December 2023

Are you curious about publishing with AGU? Do you have data or software that's related to your journal article? Learn about AGU Publications' data and software citation policy, how to comply, and how to increase the transparency, reproducibility, and openness of your science!
Generalised random tessellation stratified sampling over auxiliary spaces
Creators: name: Robertson, B. L.
name: Price, C. J.
name: Reale, M.
name: Brown, J. A.
Publisher: name: Taylor & Francis
Year: 2025
Subjects: subject: Space Science
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Astronomical and Space Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer
subject: Mental Health

description: Generalised Random Tessellation Stratified (GRTS) is a popular spatially balanced sampling design. GRTS can draw spatially balanced probability samples in two dimensions but has not been used to sample higher-dimensional auxiliary spaces. This article considers applying dimensionality reduction techniques to multidimensional auxiliary spaces to allow GRTS to be used to sample them. The aim is to improve the precision of GRTS-based estimators of population characteristics by incorporating auxiliary information into the GRTS sample. We numerically evaluate two dimensionality reduction techniques for equal and unequal probability samples on two spatial populations. Multipurpose surveys are also considered. Results show that GRTS samples from these two-dimensional spaces can improve the precision of GRTS over spatial coordinates.
Entanglement entropy of a superflow
Creators: name: Khlebnikov, Sergei
name: Sheoran, Akhil
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We consider the theory of $N$ free Dirac fermions with a uniformly winding mass, $m e^{iqx}$, in two spacetime dimensions. This theory (which describes for instance a superconducting current in an $N$-channel wire) has been proposed to have a higher-spin gravity with scalar matter as the large-$N$ dual. To order $m^2$, however, thermodynamic quantities in it can be computed using standard general relativity instead. Here, we consider the question if the same is true for the entanglement entropy (EE). By comparing results obtained on two sides of the duality, we find that general relativity indeed accounts correctly for the EE of an interval to order $m^2$ (and all orders in $q$).
description: 15 pages, 1 figure
Elicitation on non-finite clauses and their interpretation
Creators: name: Drummond, Emily
name: Rudolph, Johnny (Soni)
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: nkr

description: Elicitation on non-finite subjunctive clauses, including their constituency, the placement of adverbs, and de-re and de-dicto interpretations.
Drift mobility of long-living excitons in coupled GaAs quantum wells
Creators: name: Gartner, A.
name: Holleitner, A. W.
name: Schuh, D.
name: Kotthaus, J. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We observe high-mobility transport of indirect excitons in coupled GaAs quantum wells. A voltage-tunable in-plane potential gradient is defined for excitons by exploiting the quantum confined Stark effect in combination with a lithographically designed resistive top gate. Excitonic photoluminescence resolved in space, energy, and time provides insight into the in-plane drift dynamics. Across several hundreds of microns an excitonic mobility of >10^5 cm2/eVs is observed for temperatures below 10 K. With increasing temperature the excitonic mobility decreases due to exciton-phonon scattering.
description: 3 pages, 3 figures
Dolichogenidea sophiae
Creators: name: Fernandez-Triana, Jose
name: Sakagami, Kota
name: Shimizu, So
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea sophiae

description: D. sophiae (Papp, 1972): Ovipositor sheath much shorter (approximately 0.5 times) than metatibia, and broader at apex (almost like spoon-shaped).
description: Published as part of Fernandez-Triana, Jose, Sakagami, Kota & Shimizu, So, 2018, Dolichogenidea maetoi sp. nov. (Hymenoptera: Braconidae) from Japan, the first parasitoid wasp recorded from Hyblaea fortissima (Lepidoptera), pp. 167-175 in Acta Entomologica Musei Nationalis Pragae 58 (1) on page 174, DOI: 10.2478/aemnp-2018-0014, http://zenodo.org/record/3699178
Magnetoresistance of UPt3
Creators: name: Lippman, T. M.
name: Davis, J. P.
name: Choi, H.
name: Pollanen, J.
name: Halperin, W. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have performed measurements of the temperature dependence of the magnetoresistance up to 9 T in bulk single crystals of UPt3 with the magnetic field along the b axis, the easy magnetization axis. We have confirmed previous results for transverse magnetoresistance with the current along the c axis, and report measurements of the longitudinal magnetoresistance with the current along the b axis. The presence of a linear term in both cases indicates broken orientational symmetry associated with magnetic order. With the current along the c axis the linear term appears near 5 K, increasing rapidly with decreasing temperature. For current along the b axis the linear contribution is negative.
description: 6 pages, 3 figures, submitted to Quantum Fluids and Solids Conference (QFS 2006)
A Principle to Determine the Number (3 + 1) of Large Spacetime Dimensions
Creators: name: Rama, S. Kalyana
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We assume that our universe originated from highly excited and interacting strings with coupling constant g_s = {\cal O} (1). Fluctuations of spacetime geometry are large in such strings and the physics dictating the emergence of a final spacetime configuration is not known. We propose that, nevertheless, it is determined by an entropic principle that the final spacetime configuration must have maximum entropy for a given amount of energy. This principle implies, under some assumptions, that the spacetime configuration that emerges finally is a (3 + 1) -- dimensional FRW universe filled with w = 1 perfect fluid and with 6 -- dimensional compact space of size l_s; in particular, the number of large spacetime dimensions is d = 3 + 1. Such an universe may evolve subsequently into our universe, perhaps as in Banks -- Fischler scenario.
description: 11 pages. Latex file. Version 2: References added
Resonant tunneling in a schematic model
Creators: name: Bacca, S.
name: Feldmeier, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Tunneling of an harmonically bound two-body system through an external Gaussian barrier is studied in a schematic model which allows for a better understanding of intricate quantum phenomena. The role of finite size and internal structure is investigated in a consistent treatment. The excitation of internal degrees of freedom gives rise to a peaked structure in the penetration factor. The model results indicate that for soft systems the adiabatic limit is not necessarily reached although often assumed in fusion of nuclei and in electron screening effects at astrophysical energies.
description: 7 pages, 7 figures
A Holographic Dual of CFT with Flavor on de Sitter Space
Creators: name: Hirayama, Takayuki
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We introduce a D7-brane probe in AdS_5 x S^5 background in a way that the 4d part of the induced metric on D7-brane becomes 4d de-Sitter space (dS_4) inside AdS_5 instead of 4d Minkowski space. Although supersymmetry is completely broken, we obtain a static configuration and show the absence of dynamical tachyonic modes. Following holographic renormalization we renormalize the Dirac-Born-Infeld action of D7-brane and we completely fix the counter terms including finite contributions from the consistency under various limits. Through the AdS/CFT correspondence we study the chiral condensate and meson spectrum of CFT dual theory on dS_4 where the energy scale is identified with the direction normal to dS_4 space in AdS_5. We identify and properly reproduce the finite temperature effects on dS_4. Our results support the holographic interpretation of the Randall-Sundrum model with non fine-tuned dS_4 brane(s) and the holography between AdS_p (or dS_p) bulk gravity and CFT on dS_{p-1} called the (A)dS/dS correspondence.
description: 19 pages, 8 figures; v2: comments added, references added, typos corrected
Dolichogenidea solenobiae
Creators: name: Fernandez-Triana, Jose
name: Sakagami, Kota
name: Shimizu, So
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea solenobiae

description: D. solenobiae (Walley, 1935): All legs (except for coxae) yellow.
description: Published as part of Fernandez-Triana, Jose, Sakagami, Kota & Shimizu, So, 2018, Dolichogenidea maetoi sp. nov. (Hymenoptera: Braconidae) from Japan, the first parasitoid wasp recorded from Hyblaea fortissima (Lepidoptera), pp. 167-175 in Acta Entomologica Musei Nationalis Pragae 58 (1) on page 174, DOI: 10.2478/aemnp-2018-0014, http://zenodo.org/record/3699178
The minimal entropy martingale measure for general Barndorff-Nielsen/Shephard models
Creators: name: Rheinländer, Thorsten
name: Steiger, Gallus
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: Statistical Finance (q-fin.ST)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: 28D20, 60G48, 60H05, 91B28 (Primary)

description: We determine the minimal entropy martingale measure for a general class of stochastic volatility models where both price process and volatility process contain jump terms which are correlated. This generalizes previous studies which have treated either the geometric Lévy case or continuous price processes with an orthogonal volatility process. We proceed by linking the entropy measure to a certain semi-linear integro-PDE for which we prove the existence of a classical solution.
description: Published at http://dx.doi.org/10.1214/105051606000000240 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Dolichogenidea spanis Chen & Song 2004
Creators: name: Fernandez-Triana, Jose
name: Sakagami, Kota
name: Shimizu, So
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea spanis

description: D. spanis Chen & Song, 2004: Ovipositor sheath longer than metatibia (around 1.2 times); propodeum with complete areola.
description: Published as part of Fernandez-Triana, Jose, Sakagami, Kota & Shimizu, So, 2018, Dolichogenidea maetoi sp. nov. (Hymenoptera: Braconidae) from Japan, the first parasitoid wasp recorded from Hyblaea fortissima (Lepidoptera), pp. 167-175 in Acta Entomologica Musei Nationalis Pragae 58 (1) on page 174, DOI: 10.2478/aemnp-2018-0014, http://zenodo.org/record/3699178
An HST Archival Survey of Feathers in Spiral Galaxies
Creators: name: La Vigne, Misty A.
name: Vogel, Stuart N.
name: Ostriker, Eve C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a survey of spiral arm extinction substructure referred to as feathers in 223 spiral galaxies using HST WFPC2 images. The sample includes all galaxies in the RC3 catalog with cz < 5000 km/s, B_T < 15, i < 60 degrees, and types Sa--Sd with well-exposed broadband WFPC2 images. The detection frequency of delineated, periodic feathers in this sample is 20% (45 of 223). This work is consistent with Lynds (1970), who concluded that feathers are common in prototypical Sc galaxies; we find that feathers are equally common in Sb galaxies. Sb--Sc galaxies without clear evidence for feathers either had poorer quality images, or flocculent or complex structure. We did not find clearly defined feathers in any Scd--Sd galaxy. The probability of detecting feathers was highest (83%) for spirals with well-defined primary dust lanes (PDLs; the lanes which line the inner edge of an arm); well-defined PDLs were only noted in Sab--Sc galaxies. Consistent with earlier work, we find that neighboring feathers tend to have similar shapes and pitch angles. OB associations are often found lining feathers, and many feathers transition to the stellar substructures known as spurs (Elmegreen 1980). We find that feathers are coincident with interarm filaments strikingly revealed in Spitzer 8 micron images. Comparison with CO 1-0 maps of NGC 0628 and NGC 5194 from BIMA SONG shows that feathers originate at the PDL coincident with gas surface density peaks. Contrary to the appearance at 8 microns, the CO maps show that gas surface density in feathers decreases rapidly with distance from the PDL. Also, we find that the spacing between feathers decreases with increasing gas surface density, consistent with formation via a gravitational instability.
description: 47 pages, 22 figures (Figures 1-16,18 are in JPEG format, figures 17,19-22 are embedded postscript files; full resolution images at http://www.astro.umd.edu/~mlavigne/research/hst-survey-06-2006/). Accepted for publication in the ApJ
Insulating regime of an underdamped current-biased Josephson junction supporting $\mathbb{Z}_3$ and $\mathbb{Z}_4$ parafermions
Creators: name: Svetogorov, Aleksandr E.
name: Loss, Daniel
name: Klinovaja, Jelena
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study analytically a current-biased topological Josephson junction supporting $\mathbb{Z}_n$ parafermions. First, we show that in an infinite-size system a pair of parafermions on the junction can be in $n$ different states; the $2π{n}$ periodicity of the phase potential of the junction results in a significant suppression of the maximal current $I_m$ for an insulating regime of the underdamped junction. Second, we study the behaviour of a realistic finite-size system with avoided level crossings characterized by splitting $δ$. We consider two limiting cases: when the phase evolution may be considered adiabatic, which results in decreased periodicity of the effective potential, and the opposite case, when Landau-Zener transitions restore the $2π{n}$ periodicity of the phase potential. The resulting current $I_m$ is exponentially different in the opposite limits, which allows us to propose a new detection method to establish the appearance of parafermions in the system experimentally, based on measuring $I_m$ at different values of the splitting $δ$.
The Infinite Universe (Extended)
Creators: name: Ndoni, Albi
Publisher: name: Zenodo
Year: 2024
Subjects: subject: Infinity
subject: Mathematics
subject: FOS: Mathematics
subject: Universe

description: The concept I’ve presented draws an analogy between the mathematical notions of infinity (+∞ and -∞) and the potential infinitude of the Universe in both macroscopic (infinitely big) and microscopic (infinitely small) directions. However, it's essential to understand that while this analogy might seem intriguing, mathematical concepts of infinity don't directly prove the actual properties or boundaries of the physical Universe.
Extended quintessence, inflation, and stable de Sitter spaces
Creators: name: Faraoni, Valerio
name: Jensen, Michael N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A new gauge-invariant criterion for stability against inhomogeneous perturbations of de Sitter space is applied to scenarios of dark energy and inflation in scalar-tensor gravity. The results extend previous studies.
description: 16 pages, LaTeX, to appear in Class. Quantum Grav
Minimizing back-action through entangled measurements
Creators: name: Wu, Kang-Da
name: Bäumer, Elisa
name: Tang, Jun-Feng
name: Hovhannisyan, Karen V.
name: Perarnau-Llobet, Martí
name: Xiang, Guo-Yong
name: Li, Chuan-Feng
name: Guo, Guang-Can
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: When an observable is measured on an evolving coherent quantum system twice, the first measurement generally alters the statistics of the second one, which is known as measurement back-action. We introduce, and push to its theoretical and experimental limits, a novel method of back-action evasion, whereby entangled collective measurements are performed on several copies of the system. This method is inspired by a similar idea designed for the problem of measuring quantum work [Perarnau-Llobet \textit{et al}., (https://doi.org/10.1103/PhysRevLett.118.070601) Phys. Rev. Lett. \textbf{118}, 070601 (2017)]. By utilizing entanglement as a resource, we show that the back-action can be extremely suppressed compared to all previous schemes. Importantly, the back-action can be eliminated in highly coherent processes.
Elicitation on embedded ina, the post-verbal position, and definites
Creators: name: Lekka, Mina
name: Drummond, Emily
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: nkr

description: Elicitation on extraction from embedded clauses, adverbs and directionals in the post-verbal position, and strong and weak definites, including generics, unique referents, etc.
Spurious Eccentricities of Distorted Binary Components
Creators: name: Eaton, Joel A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I discuss the effect of physical distortion on the velocities of close binary components and how we may use the resulting distortion of velocity curves to constrain some properties of binary systems, such as inclination and mass ratio. Precise new velocities for 5 Cet convincingly detect these distortions with their theoretically predicted phase dependence. We can even use such distortions of velocity curves to test Lucy's theory of convective gravity darkening. The observed distortions for TT Hya and 5 Cet require the contact components of those systems to be gravity darkened, probably somewhat more than predicted by Lucy's theory but clearly not as much as expected for a radiative star. These results imply there is no credible evidence for eccentric orbits in binaries with contact components. I also present some speculative analyses of the observed properties of a binary encased in a non-rotating common envelope, if such an object could actually exist, and discuss how the limb darkening of some recently calculated model atmospheres for giant stars may bias my resuts for velocity-curve distortions, as well as other results from a wide range of analyses of binary stars.
description: 14 pp, 2 tables, 12 fig; under review by ApJ
Precision Tests of CO and [CII] Power Spectra Models against Simulated Intensity Maps
Creators: name: Dizgah, Azadeh Moradinezhad
name: Nikakhtar, Farnik
name: Keating, Garrett K.
name: Castorina, Emanuele
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Line intensity mapping (LIM) is an emerging technique with a unique potential to probe a wide range of scales and redshifts. Realizing the full potential of LIM, however, relies on accurate modeling of the signal. We introduce an extended halo model for the power spectrum of intensity fluctuations of CO rotational lines and [CII] fine transition line in real space, modeling nonlinearities in matter fluctuations and biasing relation between the line intensity fluctuations and the underlying dark matter distribution. We also compute the stochastic contributions beyond the Poisson approximation using the halo model framework. To establish the accuracy of the model, we create the first cosmological-scale simulations of CO and [CII] intensity maps, \textsf{MithraLIMSims}, at redshifts $0.5 \leq z\leq6$, using halo catalogs from Hidden-Valley simulations, and painting halos according to mass-redshift-luminosity relations for each line. We show that at $z=1$ on scales $k_{\rm max} \lesssim 0.8 \ {\rm Mpc}^{-1}h$, the model predictions of clustering power (with only two free parameters) are in agreement with the measured power spectrum at better than 5\%. At higher redshift of $z=4.5$, this remarkable agreement extends to smaller scale of $ k_{\rm max} \lesssim 2 \ {\rm Mpc}^{-1}h$. Furthermore, we show that on large scales, the stochastic contributions to CO and CII power spectra are non-Poissonian, with amplitudes reproduced reasonably well by the halo model prescription. Lastly, we assess the performance of the theoretical model of the baryon acoustic oscillations (BAO) and show that hypothetical LIM surveys probing CO lines at $z=1$, that can be deployed within this decade, will be able to make a high significance measurement of the BAO. On a longer time scale, a space-based mission probing [CII] line can uniquely measure the BAO on a wide range of redshifts at an unprecedented precision.
description: v3 matches the published article
Asymmetry Function of Interstellar Scintillations of Pulsars
Creators: name: Shishov, V. I.
name: Smirnova, T. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A new method for separating intensity variations of a source's radio emission having various physical natures is proposed. The method is based on a joint analysis of the structure function of the intensity variations and the asymmetry function, which is a generalization of the asymmetry coefficient and characterizes the asymmetry of the distribution function of the intensity fluctuations on various scales for the inhomogeneities in the diffractive scintillation pattern. Relationships for the asymmetry function in the cases of a logarithmic normal distribution of the intensity fluctuations and a normal distribution of the field fluctuations are derived. Theoretical relationships and observational data on interstellar scintillations of pulsars (refractive, diffractive, and weak scintillations) are compared. Pulsar scintillations match the behavior expected for a normal distribution of the field fluctuations (diffractive scintillation) or logarithmic normal distribution of the intensity fluctuations (refractive and weak scintillation). Analysis of the asymmetry function is a good test for distinguishing scintillations against the background of variations that have different origins.
Massive Celestial Fermions
Creators: name: Narayanan, Sruthi A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In an effort to further the study of amplitudes in the celestial CFT (CCFT), we construct conformal primary wavefunctions for massive fermions. Upon explicitly calculating the wavefunctions for Dirac fermions, we deduce the corresponding transformation of momentum space amplitudes to celestial amplitudes. The shadow wavefunctions are shown to have opposite spin and conformal dimension $2-Δ$. The Dirac conformal primary wavefunctions are delta function normalizable with respect to the Dirac inner product provided they lie on the principal series with conformal dimension $Δ= 1+iλ$ for $λ\in\mathbb{R}$. It is shown that there are two choices of a complete basis: single spin $J=\frac{1}{2}$ or $J=-\frac{1}{2}$ and $λ\in\mathbb{R}$ or multiple spin $J=\pm\frac{1}{2}$ and $λ\in\mathbb{R}_{+\cup 0}$. The massless limit of the Dirac conformal primary wavefunctions is shown to agree with previous literature. The momentum generators on the celestial sphere are derived and, along with the Lorentz generators, form a representation of the Poincare algebra. Finally, we show that the massive spin-$1$ conformal primary wavefunctions can be constructed from the Dirac conformal primary wavefunctions using the standard Clebsch-Gordan coefficients. We use this procedure to write the massive spin-$\frac{3}{2}$, Rarita-Schwinger, conformal primary wavefunctions. This provides a prescription for constructing all massive fermionic and bosonic conformal primary wavefunctions starting from spin-$\frac{1}{2}$.
description: 12 pages + 4 pages of appendices; v2 minor typos fixed and small clarifications added
Taxas de processamento em artigos brasileiros
Creators: name: Lorensi do Canto, Fabio
name: Segundo, Washington
name: da Silva Neubert, Patricia
Publisher: name: Zenodo
Year: 2024

description: Apresentação realizada na sessão Pecha Kucha II, da 15ª Conferência Lusófona de Ciência Aberta, na Escola Superior de Enfermagem do Porto (ESEP), de 01 a 04 de outubro de 2024.
Diffractive orbits in the length spectrum of a 2D microwave cavity with a small scatterer
Creators: name: Laurent, David
name: Legrand, Olivier
name: Mortessagne, Fabrice
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: In a 2D rectangular microwave cavity dressed with one point-like scatterer, a semiclassical approach is used to analyze the spectrum in terms of periodic orbits and diffractive orbits. We show, both numerically and experimentally, how the latter can be accounted for in the so-called length spectrum which is retrieved from 2-point correlations of a finite range frequency spectrum. Beyond its fundamental interest, this first experimental evidence of the role played by diffractive orbits in the spectrum of an actual cavity, can be the first step towards a novel technique to detect and track small defects in wave cavities.
description: 14 pages, format IOP
Measurement of exclusive D meson decays to eta and eta' final states and SU(3) amplitude analysis
Creators: name: CLEO Collaboration
name: Artuso, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Using 281 pb^-1 of data collected with the CLEO-c detector, we present new measurements of Cabibbo-suppressed decays of D0 and D+ mesons to eta and eta' final states. We make first observations of D0-->eta'pi0, eta eta, eta eta', and eta pi+ pi-, and find evidence for D+ --> eta pi+ pi0$, D+ --> eta' pi+ pi0 and D0 --> eta' pi+ pi-. We also report on improved measurements of D0-->eta pi0, D+ --> eta pi+ and D+ --> etap' pi+. Using the measured two-body Cabibbo-suppressed decays, we extract amplitudes for specific flavor topologies and compare them to those from Cabibbo-favored decays.
description: 15 pages, accepted to PRD
Dolichogenidea subemarginata
Creators: name: Fernandez-Triana, Jose
name: Sakagami, Kota
name: Shimizu, So
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Braconidae
Dolichogenidea
Dolichogenidea subemarginata

description: D. subemarginata (Abdinbekova, 1969): T1 narrowing towards apex and with scattered small punctures; T2 almost to entirely smooth.
description: Published as part of Fernandez-Triana, Jose, Sakagami, Kota & Shimizu, So, 2018, Dolichogenidea maetoi sp. nov. (Hymenoptera: Braconidae) from Japan, the first parasitoid wasp recorded from Hyblaea fortissima (Lepidoptera), pp. 167-175 in Acta Entomologica Musei Nationalis Pragae 58 (1) on page 174, DOI: 10.2478/aemnp-2018-0014, http://zenodo.org/record/3699178
Raman interferometry between autoionizing states to probe ultrafast wavepacket dynamics with high spectral resolution
Creators: name: Plunkett, A.
name: Alarcon, M. A.
name: Wood, J. K.
name: Greene, C. H.
name: Sandhu, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Photoelectron interferometry with femto- and atto-second light pulses is a powerful probe of the fast electron wavepacket dynamics, albeit it has practical limitations on the energy resolution. We show that one can simultaneously obtain both high temporal and spectral resolution by stimulating Raman interferences with one light pulse and monitoring the differential changes in the electron yield in a separate step. Applying this spectroscopic approach to the autoionizing states of argon, we experimentally resolved its electronic composition and time-evolution in exquisite detail. Theoretical calculations show remarkable agreement with the observations and shed light on the light-matter interaction parameters. Using appropriate Raman probing and delayed detection steps, this technique enables highly dfferential probing and control of electron dynamics in complex systems.
description: 5 pages, 4 figures
Indirect-to-direct band gap crossover of single walled MoS$_2$ nanotubes
Creators: name: Hisama, Kaoru
name: Maruyama, Mina
name: Chiashi, Shohei
name: Maruyama, Shigeo
name: Okada, Susumu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Using density functional theory, the electronic structures of single walled molybdenum disulfide nanotubes (MoS$_2$ NTs) were investigated as a function of diameter. Our calculations show that the electronic structure near the band gap is sensitive to the NT diameter: armchair MoS$_2$ NTs act as indirect gap semiconductors for diameters up to approximately 5.0 nm, while armchair MoS$_2$ NTs with larger diameters act as direct gap semiconductors with band edges located in the vicinity of $k = 2π/3$. This finding implies that MoS$_2$ NTs with large diameters should exhibit similar photoluminescence to 2D monolayer MoS$_2$ sheets. This indirect-to-direct band gap crossover is ascribed to the upward shift of the valence band peak at the $Γ$ point in small diameter NTs, which is caused by the tensile strain resulting from their tubular structures.
description: 4 pages, 4 figures, under review
Interferometric Space Missions for the Search for Terrestrial Exoplanets: Requirements on the Rejection Ratio
Creators: name: Kaltenegger, L
name: Fridlund, M.
name: Karlsson, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The requirements on space missions designed to study Terrestrial exoplanets are discussed. We then investigate whether the design of such a mission, specifically the Darwin nulling interferometer, can be carried out in a simplified scenario. The key element here is accepting somewhat higher levels of stellar leakage. We establish detailed requirements resulting from the scientific rationale for the mission, and calculate detailed parameters for the stellar suppression required to achieve those requirements. We do this utilizing the Darwin input catalogue. The dominating noise source for most targets in this sample is essentially constant for all targets, while the leakage diminishes with the square of the distance. This means that the stellar leakage has an effect on the integration time only for the nearby stars, while for the more distant targets its influence decreases significantly. We assess the impact of different array configurations and nulling profiles and identify the stars for which the detection efficiency can be maximized.
description: 21 pages, 8 figures; TBP in Astrophysics and Space Science 2006
Masked Linear Regression for Learning Local Receptive Fields for Facial Expression Synthesis
Creators: name: Khan, Nazar
name: Akram, Arbish
name: Mahmood, Arif
name: Ashraf, Sania
name: Murtaza, Kashif
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Compared to facial expression recognition, expression synthesis requires a very high-dimensional mapping. This problem exacerbates with increasing image sizes and limits existing expression synthesis approaches to relatively small images. We observe that facial expressions often constitute sparsely distributed and locally correlated changes from one expression to another. By exploiting this observation, the number of parameters in an expression synthesis model can be significantly reduced. Therefore, we propose a constrained version of ridge regression that exploits the local and sparse structure of facial expressions. We consider this model as masked regression for learning local receptive fields. In contrast to the existing approaches, our proposed model can be efficiently trained on larger image sizes. Experiments using three publicly available datasets demonstrate that our model is significantly better than $\ell_0, \ell_1$ and $\ell_2$-regression, SVD based approaches, and kernelized regression in terms of mean-squared-error, visual quality as well as computational and spatial complexities. The reduction in the number of parameters allows our method to generalize better even after training on smaller datasets. The proposed algorithm is also compared with state-of-the-art GANs including Pix2Pix, CycleGAN, StarGAN and GANimation. These GANs produce photo-realistic results as long as the testing and the training distributions are similar. In contrast, our results demonstrate significant generalization of the proposed algorithm over out-of-dataset human photographs, pencil sketches and even animal faces.
description: IJCV Journal
D^0-D^0bar mixing in Υ(1S) \to D^0 D^0bar decay at Super-B
Creators: name: Li, Hai-Bo
name: Yang, Mao-Zhi
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: $\Dz-\Dzb$ mixing and significant CP violation in the charm system may indicate the signature of new physics. In this study, we suggest that the coherent $\DzDzb$ events from the decay of $Υ(1S) \to \Dz \Dzb$ can be used to measure both mixing parameters and CP violation in charm decays. The neutral $D$ mesons from $Υ(1S)$ decay are strongly boosted, so that it will offer the possibility to measure the proper-time interval, $Δt$, between the fully-reconstructed $\Dz$ and $\Dzb$. Both coherent and time-dependent information can be used to extract $\Dz-\Dzb$ mixing parameters. The sensitivity of the measurement should be improved at B factories or super-B.
description: 6 pages, 1 figure, this is the last version to appear in Phys. Rev. D
Rayleigh-Brillouin light scattering spectroscopy of air; experiment, predictive model and dimensionless scaling
Creators: name: Wang, Yuanqing
name: Gu, Ziyu
name: Liang, Kun
name: Ubachs, Wim
Publisher: name: arXiv
Year: 2020
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Spontaneous Rayleigh-Brillouin scattering (RBS) experiments have been performed in air for pressures in the range 0.25 - 3 bar and temperatures in the range 273 - 333 K. The functional behaviour of the RB-spectral profile as a function of experimental parameters, such as the incident wavelength, scattering angle, pressure and temperature is analyzed, as well as the dependence on thermodynamic properties of the gas, as the shear viscosity, the thermal conductivity, the internal heat capacity and the bulk viscosity. Measurements are performed in a scattering geometry detecting at a scattering angle $θ=55.7^\circ$ and an incident wavelength of $λ_i=532.22$ nm, at which the Brillouin features become more pronounced than in a right angles geometry and for ultraviolet light. For pressure conditions of 1 - 3 bar the RB-spectra, measured at high signal-to-noise ratio, are compared to Tenti-S6 model calculations and values for the bulk viscosity of air are extracted. Values of $η_b$ are found to exhibit a linear dependence on temperature over the measurement interval in the range $1.0 - 2.0 \times 10^{-5}$ Pa$\cdot$s. A temperature dependent value is deduced from a collection of experiments to yield: $η_{\rm b} = (0.86 \times 10^{-5}) + 1.29 \times 10^{-7} \cdot (T - 250)$. These results are implemented in model calculations that were verified for the low pressure conditions ($p < 1$ bar) relevant for the Earth's atmosphere. As a result we demonstrate that the RB-scattering spectral profiles for air under sub-atmospheric conditions can be generated via the Tenti-S6 model, for given gas-phase and detection conditions ($p$, $T$, $λ_i$, and $θ$), and for values for the gas transport coefficients.
A correctly scaling rigorously spin-adapted and spin-complete open-shell CCSD implementation for arbitrary high-spin states
Creators: name: Herrmann, Nils
name: Hanrath, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: In this paper, we report on a correctly scaling novel coupled cluster singles and doubles (CCSD) implementation for arbitrary high-spin open-shell states. The chosen cluster operator is completely spin-free, i.e. employs spatial substitutions only. It is composed of our recently developed Löwdin-type operators (doi: 10.1063/5.0026762), which ensure (1) spin completeness and (2) spin adaption i.e. spin purity of the CC wave function. In contrast to the proof-of-concept matrix-representation-based implementation presented there, the present implementation relies on second quantization and factorized tensor contractions. The generated singles and doubles operators are embedded in an equation generation engine. In the latter, Wick's theorem is used to derive prefactors arising from spin integration directly from the spin-free full contraction patterns. The obtained Wick terms composed of products of Kronecker deltas are represented by special non-antisymmetrized Goldstone diagrams. Identical (redundant) diagrams are identified by solving the underlying graph isomorphism problem. All non-redundant graphs are then automatically translated to locally -- one term at a time -- factorized tensor contractions. Finally, the spin-adapted and spin-complete (SASC) CCS and CCSD variants are applied to a set of small molecular test systems. Both correlation energies and amplitude norms hint towards a reasonable convergence of the SASC-CCSD method for a BCH series truncation of order four. In comparison to spin orbital CCSD, SASC-CCSD leads to slightly improved correlation energies with differences of up to 0.886 mE_H (0.98% w.r.t. spin orbital CCSD(T)).
description: 18 pages, 3 figures, 7 tables
Smartphone usage for learning among postgraduate students
Creators: name: Rahman, Kazi Turin
Publisher: name: figshare
Year: 2021
Subjects: subject: Education
subject: 130212 Science, Technology and Engineering Curriculum and Pedagogy
subject: FOS: Educational sciences
subject: 80502 Mobile Technologies
subject: FOS: Computer and information sciences

description: This study explores the numerous effects smartphones have on learning among postgraduate students. Research objectives were formulated from the gaps in literature which comprise of exploring influential factors, pros and cons along with academic performance, which surround smartphone usage in an educational setting. Moreover, this study followed a cross-sectional research design consisting of a purposive sampling technique. Template analysis was conducted on data collected via telephonic interviews. Altogether, the results revealed that 40% of respondents believe that the internet is a key influential factor when it comes to using smartphones for educational purposes. In addition, many of the benefits and drawbacks of smartphone usage in learning were highlighted by the students. Seventy per cent vouched for being able to learn while away from laptops whereas 60% said it was distracting. Plus, 80% of respondents perceive that smartphone usage does not have an impact on their academic standing. They associated more importance to the primary ways of learning through computers and laptops. Assessments were also drawn using popular theoretical concepts like Goodhue and Thompson’s Technology-to-Performance Chain (TPC) model. Henceforth, this study has enriched the existing literature in terms of novel contributions. It is recommended that future researchers conduct experiments on a larger sample size to further enrich smartphone literature.
About the connection between vacuum birefringence and the light-light scattering amplitude
Creators: name: Haissinski, J.
name: Dagoret, S.
name: Urban, M.
name: Zomer, F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Birefringence phenomena stemming from vacuum polarization are revisited in the framework of coherent scattering. Based on photon-photon scattering, our analysis brings out the direct connection between this process and vacuum birefringence. We show how this procedure can be extended to the Kerr and the Cotton-Mouton birefringences in vacuum, thus providing a unified treatment of various polarization schemes, including those involving static fields.