cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Phytoremediation of formaldehyde by three selected non-native indoor plant species
Creators: name: Khalifa, Abeer Ahmed
name: Alalaiwat, Dalal
name: Khan, Ezzat
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Biophysics
subject: Biochemistry
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences

description: Formaldehyde is an organic volatile compound and a commonly used chemical in various construction materials thus causing dwellers to be exposed to it inside a building. Its remediation from indoor air has been carried out through various techniques where potted plants and living walls are at the front foot. It is necessary to study plants under various conditions for their efficiency. We selected three plant species Epipremnum aureum, Chlorophytum comosum, and Spathiphyllum wallisii non-native of Bahrain. These plants were tested under normal conditions in a sealed fumigation box where formaldehyde concentration was kept ∼3 ppm, CO2 ∼ 450 ppm, light intensity 1000 Lx (equal to 13.5 µmol.m−2.s−1), irrigated with tap water. Analysis of Variance (ANOVA) statistical method was performed to test the significant differences of purification efficiencies of the tested indoor plants against HCHO. In addition, the statistical method was used to test the significant difference, if any, of the plants to CO2 emission because of absorbing HCHO. The physical health of plants and their short-term remediation ability reveals that all plants exhibited up to 70% remediation potential and tolerance to remediate the target chemical. It is evident that the impact of local environmental factors on the plants is negligible. Epipremnum aureum, Chlorophytum comosum, and Spathiphyllum wallisii are non-native plants available in Bahrain for decorative purposes.Their efficiency against formaldehyde under local indoor environment was studied for the first time.Under normal conditions the plant proved to be sufficiently tolerant toward normal conditions. The efficiency in normal soil system is very good.The efficiency of the three species was mutually compared, statistical modeling reveal that they are significantly close to each other in terms of formaldehyde remediation to purify ambient air. Epipremnum aureum, Chlorophytum comosum, and Spathiphyllum wallisii are non-native plants available in Bahrain for decorative purposes. Their efficiency against formaldehyde under local indoor environment was studied for the first time. Under normal conditions the plant proved to be sufficiently tolerant toward normal conditions. The efficiency in normal soil system is very good. The efficiency of the three species was mutually compared, statistical modeling reveal that they are significantly close to each other in terms of formaldehyde remediation to purify ambient air.
Long-distance coupling of spin qubits via topological magnons
Creators: name: Hetényi, Bence
name: Mook, Alexander
name: Klinovaja, Jelena
name: Loss, Daniel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider two distant spin qubits in quantum dots, both coupled to a two-dimensional topological ferromagnet hosting chiral magnon edge states at the boundary. The chiral magnon is used to mediate entanglement between the spin qubits, realizing a fundamental building block of scalable quantum computing architectures: a long-distance two-qubit gate. Previous proposals for long-distance coupling with magnons involved off-resonant coupling, where the detuning of the spin-qubit frequency from the magnonic band edge provides protection against spontaneous relaxation. The topological magnon mode, on the other hand, lies in-between two magnonic bands far away from any bulk magnon resonances, facilitating strong and highly tuneable coupling between the two spin qubits. Even though the coupling between the qubit and the chiral magnon is resonant for a wide range of qubit splittings, we find that the magnon-induced qubit relaxation is vastly suppressed if the coupling between the qubit and the ferromagnet is antiferromagnetic. A fast and high-fidelity long-distance coupling protocol is presented capable of achieving spin-qubit entanglement over micrometer distances with $1\,$MHz gate speed and up to $99.9\%$ fidelities. The resulting spin-qubit entanglement may be used as a probe for the long-sought detection of topological edge magnons.
High-pressure growth effect on the properties of high-Tc iron-based superconductors: A short review
Creators: name: Singh, Priya
name: Manasa, Manasa
name: Azam, Mohammad
name: Singh, Shiv J.
Publisher: name: arXiv
Year: 2025
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The high-pressure growth technique is a vital approach that facilitates the stabilization of new phases and allows for meticulous control of structural parameters, which significantly impact electronic and magnetic properties. We present a short review of our ongoing investigations into various families of iron-based superconductors (IBS), employing the high-gas pressure and high-temperature synthesis (HP-HTS) method. This technique is capable of producing the gas pressures up to 1.8 GPa and a heating temperature of up to 1700 °C through a three-zone furnace within a cylindrical chamber. Different kinds of IBS samples are prepared using HPHTS and characterized through various measurements to reach the final conclusions. The results demonstrate that the high-pressure growth technique significantly enhances the properties of IBS, including the transition temperature, critical current density, and pinning force. In addition, the quality of the samples and their density are improved through the intergrain connections. Furthermore, the comprehensive evaluations and investigations prove that a growth pressure of 0.5 GPa is sufficient for producing high-quality IBS bulks under the optimized synthesis conditions.
description: 21 pages, 4 figures, 1 table
Two-Dimensional Lattice Model for the Surface States of Topological Insulators
Creators: name: Zhou, Yan-Feng
name: Jiang, Hua
name: Xie, X. C.
name: Sun, Qing-Feng
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The surface states in three-dimensional (3D) topological insulators (TIs) can be described by a two-dimensional (2D) continuous Dirac Hamiltonian. However, there exists the Fermion doubling problem when putting the continuous 2D Dirac equation into a lattice model. In this letter, we introduce a Wilson term with a zero bare mass into the 2D lattice model to overcome the difficulty. By comparing with a 3D Hamiltonian, we show that the modified 2D lattice model can faithfully describe the low-energy electrical and transport properties of surface states of 3D TIs. So this 2D lattice model provides a simple and cheap way to numerically simulate the surface states of 3D TI nanostructures. Based on the 2D lattice model, we also establish the wormhole effect in a TI nanowire by a magnetic field along the wire and show the surface states being robust against disorder. The proposed 2D lattice model can be extensively applied to study the various properties and effects, such as the transport properties, Hall effect, universal conductance fluctuations, localization effect, etc.. So it paves a new way to study the surface states of the 3D topological insulators.
description: 7 pages, 5 figures
Economic Impact of Second-Home Communities: A Case Study of Lake Latonka, Pa.
Creators: name: Brown, Richard N.
name: Brown, Richard N.
Publisher: name: Unknown
Year: 1970
Subjects: subject: Community/Rural/Urban Development
subject: Financial Economics
subject: Land Economics/Use
subject: Public Economics
subject: Resource /Energy Economics and Policy
subject: Economic impacts
subject: Second homes
subject: Vacation properties
subject: New towns
subject: Outdoor recreation
subject: Resource development
subject: Residential subdivisions
subject: Pennsylvania

description: This study describes the transformation of 1,275 acres of Pennsylvania farmland into a 1,600-lot second homesite subdivision with a 270-acre lake. The study estimates that the first $7 million of development activities at Lake Latonka could generate $14 million of business activity before 1970, with less than 40 percent of the total accruing to local businessmen. Financing of development activities is expected to have a significant impact on the local area. Variable use and special use expenditures of homesite buyers and their guests generated $2.6 to $6.7 million of economic activity during 1965-70, with half of this total accruing to local businessmen. After 1970, however, use expenditures are expected to generate $0.5 to $1 million annually. Maintenance expenditures, initially small, will produce $0.3 to $0.6 million of gross business activity annually by 1975. The report also discusses the new community's impact on real estate taxes and demand for public services from adjoining communities.
Gravitational-wave bursts from spin-precessing black holes in binary systems
Creators: name: Zhang, Cheng
name: Han, Wen-Biao
name: Yang, Shu-Cheng
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Gravitational waves from precessing binary black holes exhibit new features that are absent in non-precessionary systems. All current waveform models take into account only the modulation of the signal due to precession. In this letter, we find that this effect has its own signature, by gravitational emission of a short and transient signal, or burst. The frequency of the burst is comparable to that of the late stage of the inspiral. We show that under certain conditions, this signal is strong enough to be detected by Advanced LIGO. For third-generation detectors like the Einstein telescope, the calculated signal-to-noise ratio can reach higher values. Measurements of precession would provide valuable insights into the intrinsic structure of black holes, and therefore into astrophysical binary formation mechanisms.
description: 5 pages, 2 figures
THE SPECTRAL HALO
Creators: name: PANOZZO, SIMONE
Publisher: name: Universit� degli Studi di Milano
Year: 2019

description: In this thesis, we construct a function defined over the space of integral overconvergent modular forms of Andreatta, Iovita and Pilloni, taking values in the module of continuous functions from p adic integers to a suitably constructed perfection of an overconvergence region of the formal weight space. The existence of this function is related to the possibility of proving Coleman's Halo conjecture about the distribution of eigenvalues of the Hecke operator at p acting on spaces of overconvergent modular forms. In the thesis, we construct the function, and we also compute explicitly the action of the operator over those continuous functions which are in the image of the map. Moreover, in chapter 3, we also show that the space of such continuous functions admits a Mahler basis.
Coherence and entanglement of mechanical oscillators mediated by coupling to different baths
Creators: name: Boyanovsky, Daniel
name: Jasnow, David
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the non-equilibrium dynamics of two coupled mechanical oscillators with general linear couplings to two uncorrelated thermal baths at temperatures $T_1$ and $T_2$, respectively. We obtain the complete solution of the Heisenberg-Langevin equations, which reveal a coherent mixing among the normal modes of the oscillators as a consequence of their off-diagonal couplings to the baths. Unique renormalization aspects resulting from this mixing are discussed. Diagonal and off-diagonal (coherence) correlation functions are obtained analytically in the case of strictly Ohmic baths with different couplings in the strong and weak coupling regimes. An asymptotic non-equilibrium stationary state emerges for which we obtain the complete expressions for the correlations and coherence. Remarkably the coherence survives in the high temperature, classical limit for $T_1 \neq T_2$. In the case of vanishing detuning between the oscillator normal modes both coupling to one and the same bath the coherence retains memory of the initial conditions at long time. A perturbative expansion of the early time evolution reveals that the emergence of coherence is a consequence of the entanglement between the normal modes of the oscillators \emph{mediated} by their couplings to the baths. This \emph{suggests} the survival of entanglement in the high temperature limit for different temperatures of the baths which is essentially a consequence of the non-equilibrium nature of the asymptotic stationary state. An out of equilibrium setup with small detuning and large $|T_1- T_2|$ produces non-vanishing steady-state coherence and entanglement in the high temperature limit of the baths.
description: This arXiv version includes a discussion on evolution of entanglement
THREE ESSAYS ON BEHAVIOURAL ECONOMICS
Creators: name: SHAKINA, EKATERINA
Publisher: name: Universit� degli Studi di Milano
Year: 2019

description: The current PhD dissertation is the collection of three research articles in experimental economics. The focus of two of them is the problem of bank runs. The first paper is an experiment based on the extension of a well - known theoretical model of Diamond and Dybvig. The second paper is based on an alternative approach to the problem of bank runs, such that experimental subjects are less restricted by the theoretical assumptions and are given more freedom to behave as they do in real life. The third article is a preliminary version of the working paper that is devoted to the question of insufficient pension savings and the how pension system design may stimulate people to save more.
Influence of agro-wastes derived biochar and their composite on reducing the mobility of toxic heavy metals and their bioavailability in industrial contaminated soils
Creators: name: Nawab, Javed
name: Ghani, Junaid
name: Ullah, Sajid
name: Ahmad, Imran
name: Jadoon, Sultan Akbar
name: Ali, Shaukat
name: Hamidova, Emiliya
name: Muhammad, Asim
name: Waqas, Muhammad
name: Din, Zia Ud
name: Khan, Sardar
name: Khan, Ajmal
name: Rehman, Syed Aziz Ur
name: Javed, Tehseen
name: Luqman, Muhammad
name: Ullah, Zahid
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Space Science
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Science Policy

description: The agro-waste derived valuable products are prime interest for effective management of toxic heavy metals (THMs). The present study investigated the efficacy of biochars (BCs) on immobilization of THMs (Cr, Zn, Pb, Cu, Ni and Cd), bioaccumulation and health risk. Agro-wastes derived BCs including wheat straw biochar (WSB), orange peel biochar (OPB), rice husk biochar (RHB) and their composite biochar (CB) were applied in industrial contaminated soil (ICS) at 1% and 3% amendments rates. All the BCs significantly decreased the bioavailable THMs and significantly (p < 0.001) reduced bioaccumulation at 3% application with highest efficiency for CB followed by OPB, WSB and RHB as compared to control treatment. The bioaccumulation factor (BAF), concentration index (CI) and ecological risk were decreased with all BCs. The hazard quotient (HQ) and hazard index (HI) of all THMs were <1, except Cd, while carcer risk (CR) and total cancer risk index (TCRI) were decreased through all BCs. The overall results depicted that CB at 3% application rate showed higher efficacy to reduce significantly (p < 0.001) the THMs uptake and reduced health risk. Hence, the present study suggests that the composite of BCs prepared from agro-wastes is eco-friendly amendment to reduce THMs in ICS and minimize its subsequent uptake in vegetables. The present study has a scientific research scope, based on reduction of bioavailability and bioaccumulation of toxic heavy metals (THMs) by the addition of biochars derived from agro-wastes and their composite biochar (CB), thereby decreasing the potential health risk. Limited study has been conducted, especially on the impact of CB in THMs-contaminated soil. This study could fill the scientific research gap and provides useful information for mitigation of THMs present in contaminated soil, which could be followed by the Environmental Protection Agency, Ministry of Agriculture and farmers in degraded lands.
title: Thermoelastic properties of highly porous mullite ceramics
Creators: name: Schreuer, Jürgen
name: Hörster, Jan-Frederick
name: Talou, Mariano
name: Camerucci, Andrea
name: Schneider, Hartmut
Publisher: name: Deutsche Geologische Gesellschaft - Geologische Vereinigung e.V. (DGGV)
Year: 2022

description: Mullite is one of the most important constituents of oxide ceramics because of its outstanding thermo-mechanical properties in oxidizing environments at high temperatures. In order to study the influence of porosity on elastic stability, mullite ceramics with porosity up to about 57% were prepared with a novel technique based on starch consolidation casting and sintering of commercial mullite powders with approximate 3/2-composition at temperatures up to 1923 K [1]. Their coefficients of thermal expansion and elastic stiffnesses were determined between 100 K and 1600 K employing dilatometry and resonance ultrasound spectroscopy, respectively. Additionally, the microstructures were investigated employing scanning electron microscopy and X-ray tomography.  Although size (ca. 5 – 20 µm), shape and distribution of pores appear chaotic in high magnification scanning electron microscopic images, their distribution is quite homogeneous at a larger scale. The thermal expansion of the porous ceramics is very similar to the ones of dense mullite ceramics [2]. However, the bulk and Young’s moduli decrease strongly with the porosity as expected for materials having spherical pores. A critical porosity of about 71% is derived where the mullite ceramics probably lose integrity. The deviations from Cauchy-relations of the porous mullite ceramics are significantly smaller compared to the ones of dense mullite materials, reflecting the limitation of elastic interactions to the thin pore walls of the porous ceramics.

[1] Talou M.H., Camerucci M.A.: J. Eur. Ceram. Soc. 2015; 35: 1021-30.

[2] Krenzel T.F., Schreuer J.,Laubner D., Cichocki M., Schneider H.: J. Am. Ceram. Soc. 2019; 102: 416-26.
On Galilean Conformal Bootstrap II: $ξ=0$ sector
Creators: name: Chen, Bin
name: Hao, Peng-xiang
name: Liu, Reiko
name: Yu, Zhe-fei
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work, we continue our work on two dimensional Galilean conformal field theory (GCFT$_2$). Our previous work (arXiv:2011.11092) focused on the $ξ\neq 0$ sector, here we investigate the more subtle $ξ=0$ sector to complete the discussion. The case $ξ=0$ is degenerate since there emerge interesting null states in a general $ξ=0$ boost multiplet. We specify these null states and work out the resulting selection rules. Then, we compute the $ξ=0$ global GCA blocks and find that they can be written as a linear combination of several building blocks, each of which can be obtained from a $sl(2,\mathbb{R})$ Casimir equation. These building blocks allow us to give an Euclidean inversion formula as well. As a consistency check, we study four-point functions of certain vertex operators in the BMS free scalar theory. In this case, the $ξ=0$ sector is the only allowable sector in the propagating channel. We find that the direct expansion of the 4-point function reproduces the global GCA block and is consistent with the inversion formula.
description: 40 pages
Magnifying the early episodes of star formation: super star clusters at cosmological distances
Creators: name: Vanzella, E.
name: Castellano, M.
name: Meneghetti, M.
name: Mercurio, A.
name: Caminha, G. B.
name: Cupani, G.
name: Calura, F.
name: Christensen, L.
name: Merlin, E.
name: Rosati, P.
name: Gronke, M.
name: Dijkstra, M.
name: Mignoli, M.
name: Gilli, R.
name: De Barros, S.
name: Caputi, K.
name: Grillo, C.
name: Balestra, I.
name: Cristiani, S.
name: Nonino, M.
name: Giallongo, E.
name: Grazian, A.
name: Pentericci, L.
name: Fontana, A.
name: Comastri, A.
name: Vignali, C.
name: Zamorani, G.
name: Brusa, M.
name: Bergamini, P.
name: Tozzi, P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the spectrophotometric properties of a highly magnified (μ~40-70) pair of stellar systems identified at z=3.2222 behind the Hubble Frontier Field galaxy cluster MACS~J0416. Five multiple images (out of six) have been spectroscopically confirmed by means of VLT/MUSE and VLT/X-Shooter observations. Each image includes two faint (m_uv~30.6), young (<100 Myr), low-mass (<10^7 Msun), low-metallicity (12+Log(O/H)~7.7, or 1/10 solar) and compact (30 pc effective radius) stellar systems separated by ~300pc, after correcting for lensing amplification. We measured several rest-frame ultraviolet and optical narrow (σ_v 50000 K) stars within dense stellar clusters, whose dynamical mass is likely dominated by the stellar component. Remarkably, the ultraviolet metal lines are not accompanied by Lya emission (e.g., CIV / Lya > 15), despite the fact that the Lya line flux is expected to be 150 times brighter (inferred from the Hbeta flux). A spatially-offset, strongly-magnified (μ>50) Lya emission with a spatial extent 34 de-lensed). This is the first confirmed metal-line emitter at such low-luminosity and redshift without Lya emission, suggesting that, at least in some cases, a non-uniform covering factor of the neutral gas might hamper the Lya detection.
description: 11 pages, 9 figures, 2 Tables. ApJ Accepted
Ultraviolet Spectropolarimetry: Investigating stellar magnetic field diagnostics
Creators: name: Folsom, C. P.
name: Ignace, R.
name: Erba, C.
name: Casini, R.
name: Alemán, T. del Pino
name: Gayley, K.
name: Hobbs, K.
name: Sainz, R. Manso
name: Neiner, C.
name: Petit, V.
name: Shultz, M. E.
name: Wade, G. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Magnetic fields are important for stellar photospheres and magnetospheres, influencing photospheric physics and sculpting stellar winds. Observations of stellar magnetic fields are typically made in the visible, although infrared observations are becoming common. Here we consider the possibility of directly detecting magnetic fields at ultraviolet (UV) wavelengths using high resolution spectropolarimetry, specifically considering the capabilities of the proposed Polstar mission. UV observations are particularly advantageous for studying wind resonance lines not available in the visible, but they can also provide many photospheric lines in hot stars. Detecting photospheric magnetic fields using the Zeeman effect and Least Squares Deconvolution is potentially more effective in the UV due to the much higher density of strong lines. We investigate detecting magnetic fields in the magnetosphere of a star using the Zeeman effect in wind lines, and find that this could be detectable at high S/N in an O or B star with a strong magnetic field. We consider detecting magnetic fields using the Hanle effect in linear polarization, which is complementary to the Zeeman effect, and could be more sensitive in photospheric lines of rapid rotators. The Hanle effect can also be used to infer circumstellar magnetism in winds. Detecting the Hanle effect requires UV observations, and a multi-line approach is key for inferring magnetic field properties. This demonstrates that high resolution spectropolarimetry in the UV, and the proposed Polstar mission, has the potential to greatly expand our ability to detect and characterize magnetic fields in and around hot stars.
description: Accepted for publication in Astrophysics and Space Science; updated to accepted version. arXiv admin note: text overlap with arXiv:2111.06434
Discontinuous switching of position of two coexisting phases
Creators: name: Krüger, Samuel
name: Weber, Christoph A.
name: Jens-UweSommer
name: Jülicher, Frank
Publisher: name: arXiv
Year: 2017
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Here we investigate how the positions of a condensed phase can be controlled by using concentration gradients of a regulator that influences phase separation. We consider a mean field model of a ternary mixture where a concentration gradient of a regulator is imposed by an external potential. We show that novel first order phase transition exists at which the position of the condensed phase switches in a discontinuous manner. This mechanism could have implications for the spatial organization of biological cells and provides a control mechanism for droplets in microfluidic systems.
The Physical Origin of Galactic Conformity: From Theory to Observation
Creators: name: Ayromlou, Mohammadreza
name: Kauffmann, Guinevere
name: Anand, Abhijeet
name: White, Simon D. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We employ several galaxy formation models, in particular, L-GALAXIES, IllustrisTNG, and EAGLE, as well as observational samples from SDSS and DESI, to investigate galactic conformity, the observed large-scale correlation between the star-formation properties of central (primary) galaxies and those of their neighbours. To analyse the models and observations uniformly, we introduce CENSAT, a new algorithm to define whether a galaxy is a central or a satellite system based on an isolation criterion. We find that the conformity signal is present, up to at least 5 Mpc from the centres of low- and intermediate-mass centrals in the latest version of L-GALAXIES (Ayromlou et al. 2021), IllustrisTNG, and EAGLE, as well as in SDSS and DESI observational samples. In comparison, the conformity signal is substantially weaker in an older version of L-GALAXIES (Henriques et al. 2020). One of the main differences between this older model and the other models is its neglect of ram-pressure stripping of the gas reservoirs of galaxies except within the boundaries of massive cluster haloes. Our observational comparisons demonstrate that this difference significantly affects the observed large-scale conformity signal. Furthermore, by examining the contribution of backsplash, fly-by, central, and satellite galaxies to the conformity signal, we show that much, but not all, of it arises from primary galaxies near massive systems. Remaining tensions between the models and observations may be solved by modifying the physical prescriptions for how feedback processes affect the distribution and kinematics of gas and the environment around galaxies out to scales of several Megaparsecs.
description: Submitted to MNRAS
Chern-Simons Matter Theories and Higher Spin Gravity
Creators: name: Sezgin, Ergin
name: Skvortsov, Evgeny D.
name: Zhu, Yaodong
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the parity violating three point amplitudes with one scalar leg in higher spin gravity and compare results with those of Chern-Simons matter theories. The three-point correlators of the free boson, free fermion, critical vector model and Gross-Neveu model are reproduced including the dependence on the Chern-Simons coupling. We also perform a simple test of the modified higher spin equations proposed in arXiv:1605.02662 [hep-th] and find that the results are consistent with the AdS/CFT correspondence.
description: 39 pages; minor corrections and refs added
Dark matter halos and scaling relations of extremely massive spiral galaxies from extended HI rotation curves
Creators: name: Di Teodoro, Enrico M.
name: Posti, Lorenzo
name: Fall, S. Michael
name: Ogle, Patrick M.
name: Jarrett, Thomas
name: Appleton, Philip N.
name: Cluver, Michelle E.
name: Haynes, Martha P.
name: Lisenfeld, Ute
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new and archival atomic hydrogen (\hi) observations of \galnum\ of the most massive spiral galaxies in the local Universe ($M_\star>10^{11} \, \mathrm{M}_\odot$). From 3D kinematic modeling of the datacubes, we derive extended \hi\ rotation curves, and from these, we estimate masses of the dark matter halos and specific angular momenta of the discs. We confirm that massive spiral galaxies lie at the upper ends of the Tully-Fisher relation (mass vs velocity, $M \propto V^{4}$) and Fall relation (specific angular momentum vs mass, $j \propto M^{0.6}$), in both stellar and baryonic forms, with no significant deviations from single power laws. We study the connections between baryons and dark matter through the stellar (and baryon)-to-halo ratios of mass $f_\mathrm{M} \equiv M_\star/M_\mathrm{h}$ and specific angular momentum $f_\mathrm{j} \equiv j_\star/j_\mathrm{h}$ and $f_\mathrm{j,bar} \equiv j_\mathrm{bar}/j_\mathrm{h}$. Combining our sample with others from the literature for less massive disc-dominated galaxies, we find that $f_\mathrm{M}$ rises monotonically with $M_\star$ and $M_\mathrm{h}$ (instead of the inverted-U shaped $f_\mathrm{M}$ for spheroid-dominated galaxies), while $f_\mathrm{j}$ and $f_\mathrm{j,bar}$ are essentially constant near unity over four decades in mass. Our results indicate that disc galaxies constitute a self-similar population of objects closely linked to the self-similarity of their dark halos. This picture is reminiscent of early analytical models of galaxy formation wherein discs grow by relatively smooth and gradual inflow, isolated from disruptive events such as major mergers and strong AGN feedback, in contrast to the more chaotic growth of spheroids.
description: Accepted for publication on MNRAS
Small-x Evolution of the Gluon Generalized Parton Distribution Eg of the Nucleon
Creators: name: Hatta, Yoshitaka
name: Zhou, Jian
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the small-$x$ evolution equation for the gluon generalized parton distribution (GPD) $E_g$ of the nucleon. It is shown that $E_g$ at vanishing skewness exhibits the Regge behavior identical to the BFKL Pomeron, despite its association with nucleon helicity-flip processes. We also consider the effect of gluon saturation and demonstrate that $E_g$ gets saturated in the same way as its helicity-nonflip counterpart $H_g$. Our result has a direct impact on the modeling of $E_g$ as well as the small-$x$ contribution to nucleon spin sum rules.
description: 5 pages, 1 figure, v2 matches PRL version
AsNER -- Annotated Dataset and Baseline for Assamese Named Entity recognition
Creators: name: Pathak, Dhrubajyoti
name: Nandi, Sukumar
name: Sarmah, Priyankoo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences
subject: I.2.7

description: We present the AsNER, a named entity annotation dataset for low resource Assamese language with a baseline Assamese NER model. The dataset contains about 99k tokens comprised of text from the speech of the Prime Minister of India and Assamese play. It also contains person names, location names and addresses. The proposed NER dataset is likely to be a significant resource for deep neural based Assamese language processing. We benchmark the dataset by training NER models and evaluating using state-of-the-art architectures for supervised named entity recognition (NER) such as Fasttext, BERT, XLM-R, FLAIR, MuRIL etc. We implement several baseline approaches with state-of-the-art sequence tagging Bi-LSTM-CRF architecture. The highest F1-score among all baselines achieves an accuracy of 80.69% when using MuRIL as a word embedding method. The annotated dataset and the top performing model are made publicly available.
description: Published at LREC 2022. https://aclanthology.org/2022.lrec-1.706
title: Wintersemester 1967/68
title: Personal- und Vorlesungsverzeichnis, WS 1967/68
titleType: AlternativeTitle
Creators: name: (:Unkn) Unknown
Publisher: name: Pädagogische Hochschule Ruhr
Year: 1967
Subjects: subject: 000

description: Personal- und Vorlesungsverzeichnis;WS 1967/68
Phase space topology of four-wave mixing reconstructed by a neural network
Creators: name: Sheveleva, Anastasiia
name: Colman, Pierre
name: Dudley, John M
name: Finot, Christophe
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: The dynamics of ideal four-wave mixing in optical fiber is reconstructed by taking advantage of the combination of experimental measurements with supervised machine learning strategies. The training data consist of power-dependent spectral phase and amplitude recorded at the output of a short segment of fiber. The neural network is able to accurately predict the nonlinear dynamics over tens of kilometers, and to retrieve the main features of the phase space topology including multiple Fermi-Pasta-Ulam recurrence cycles and the system separatrix boundary.
description: arXiv admin note: text overlap with arXiv:2203.06962
The X-shooter/ALMA Sample of Quasars in the Epoch of Reionization. II. Black Hole Masses, Eddington Ratios, and the Formation of the First Quasars
Creators: name: Farina, Emanuele Paolo
name: Schindler, Jan-Torge
name: Walter, Fabian
name: Bañados, Eduardo
name: Davies, Frederick B.
name: Decarli, Roberto
name: Eilers, Anna-Christina
name: Fan, Xiaohui
name: Hennawi, Joseph F.
name: Mazzucchelli, Chiara
name: Meyer, Romain A.
name: Trakhtenbrot, Benny
name: Volonteri, Marta
name: Wang, Feige
name: Worseck, Gabor
name: Yang, Jinyi
name: Gutcke, Thales A.
name: Venemans, Bram P.
name: Bosman, Sarah E. I.
name: Costa, Tiago
name: De Rosa, Gisella
name: Drake, Alyssa B.
name: Onoue, Masafusa
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present measurements of black hole masses and Eddington ratios for a sample of 38 bright (M$_{1450}$ < -24.4 mag) quasars at 5.8 < z < 7.5, derived from VLT/X-shooter near-IR spectroscopy of their broad CIV and MgII emission lines. The black hole masses (on average M$_{BH}$ ~ 4.6 x 10$^9$ M$_{\odot}$) and accretion rates (with Eddington ratios ranging between 0.1 and 1.0) are broadly consistent with that of similarly luminous 0.3 < z < 2.3 quasars, but there is evidence for a mild increase in the median Eddington ratio going towards z > 6. Combined with deep ALMA observations of the [CII] 158 $μ$m line from the quasar host galaxies and VLT/MUSE investigations of the extended Ly$α$ halos, this study provides fundamental clues to models of the formation and growth of the first massive galaxies and black holes. Compared to local scaling relations, z > 5.7 black holes appear to be over-massive with respect to their host galaxies, and their accretion properties do not change with host galaxy morphology. Under the assumption that the kinematics of the T ~ 10$^4$ K gas, traced by the extended Ly$α$ halos, are dominated by the gravitational potential of the dark matter halo, we report a similar relation between the black hole mass and circular velocity to the one reported for z ~ 0 galaxies. These results paint a picture where the first supermassive black holes reside in massive halos at z > 6 and lead the first stages of galaxy formation by rapidly growing in mass with a duty cycle of order unity. However, this duty cycle needs to drastically drop towards lower redshifts, while the host galaxies continue forming stars at a rate of hundreds of solar masses per year, sustained by the large reservoirs of cool gas surrounding them.
description: Accepted for publication on AAS journals. 24 pages + appendices, 15 figures, 5 tables (including full list of z>5.7 quasars with MgII based black hole mass estimates). For access to the data and codes used in this work, please contact the authors
Electroweak single-pion production off the nucleon: from threshold to high invariant masses
Creators: name: González-Jiménez, R.
name: Jachowicz, N.
name: Niewczas, K.
name: Nys, J.
name: Pandey, V.
name: Van Cuyck, T.
name: Van Dessel, N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: [Background] Neutrino-induced single-pion production (SPP) provides an important contribution to neutrino-nucleus interactions, ranging from intermediate to high energies. There exists a good number of low-energy models in the literature to describe the neutrinoproduction of pions in the region around the Delta resonance. Those models consider only lowest-order interaction terms and, therefore, fail in the high-energy region (pion-nucleon invariant masses, $W$>2 GeV). [Purpose] Our goal is to develop a model for electroweak SPP off the nucleon, which is applicable to the entire energy range of interest for present and future neutrino-oscillation experiments. [Method] We start with the low-energy model of [Phys.Rev.D76,033005(2007)], which includes resonant contributions and background terms derived from the pion-nucleon Lagrangian of chiral-perturbation theory. Then, from the background contributions, we build a high-energy model using a Regge approach. The low- and high-energy models are combined, in a phenomenological way, into a hybrid model. [Results] The Hybrid model is identical to the low-energy model in the low-W region, but, for W>2 GeV, it implements the desired high-energy behavior dictated by Regge theory. We have tested the high-energy model by comparing with one-pion production data from electron and neutrino reactions. The Hybrid model is compared with electron-proton scattering data, with neutrino SPP data and with the predictions of the NuWro Monte Carlo event generator. [Conclusions] Our model is able to provide satisfactory predictions of the electroweak one-pion production cross section from pion threshold to high $W$. Further investigation and more data are needed to better understand the mechanisms playing a role in the electroweak SPP process in the high-W region, in particular, those involving the axial current contributions.
description: 30 pages, 21 figures. Includes comparison with NuWro predictions. New references added
Bridging Walking and Slithering – Stokesian Locomotion
Creators: name: Revzen, Shai
name: Zhao, Dan
name: Bittner, Brian
name: Clifton, Glenna
name: Gravish, Nicholas
Publisher: name: My University
Year: 2021
Subjects: subject: Computer Science
subject: Electrical Engineering
subject: Engineering

description: An extended abstract accepted to Dynamic Walking
description: Both legged locomotion and slithering motions typically utilize periodic gaits – repeating cycles of body shape change that produce a net motion through the world. Legged locomotion can be viewed from the perspective of piecewise contact constraint formation and removal. Slithering and low Reynolds number swimming operate under continuous constraints of force balance, wherein dissipation removes the ability to accumulate momentum. Here we discuss how to bridge the gap between these domains of motion, thereby, among other benefits, producing models for the space of legged locomotion with slipping. The connective fabric is the use of a “Stokesian”, or “local connection” model with the same mathematical structure.
Particle-Hole Symmetry in the Fermion-Chern-Simons and Dirac Descriptions of a Half-Filled Landau Level
Creators: name: Wang, Chong
name: Cooper, Nigel R.
name: Halperin, Bertrand I.
name: Stern, Ady
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: It is well known that there is a particle-hole symmetry for spin-polarized electrons with two-body interactions in a partially filled Landau level, which becomes exact in the limit where the cyclotron energy is large compared to the interaction strength, so one can ignore mixing between Landau levels. This symmetry is explicit in the description of a half-filled Landau level recently introduced by D. T. Son, using Dirac fermions, but it was thought to be absent in the older fermion-Chern- Simons approach, developed by Halperin, Lee, and Read and subsequent authors. We show here, however, that when properly evaluated, the Halperin, Lee, Read (HLR) theory gives results for long-wavelength low-energy physical properties, including the Hall conductance in the presence of impurities and the positions of minima in the magnetoroton spectra for fractional quantized Hall states close to half-filling, that are identical to predictions of the Dirac formulation. In fact, the HLR theory predicts an emergent particle-hole symmetry near half filling, even when the cyclotron energy is finite.
description: 21 pages, 1 figure, new version accepted by Phys. Rev. X
Phenomenology of $Λ_b \to Λ_c τ\barν_τ$ using lattice QCD calculations
Creators: name: Datta, Alakabha
name: Kamali, Saeed
name: Meinel, Stefan
name: Rashed, Ahmed
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: In a recent paper we studied the effect of new-physics operators with different Lorentz structures on the semileptonic $Λ_b \to Λ_c τ\barν_τ$ decay. This decay is of interest in light of the $R({D^{(*)}})$ puzzle in the semileptonic $\bar{B} \to D^{(*)} τ{\barν}_τ$ decays. In this work we add tensor operators to extend our previous results and consider both model-independent new physics (NP) and specific classes of models proposed to address the $R({D^{(*)}})$ puzzle. We show that a measurement of $R(Λ_c) = {\cal B}[Λ_b \to Λ_c τ\barν_τ] / {\cal B}[Λ_b \to Λ_c \ell \barν_{\ell}]$ can strongly constrain the NP parameters of models discussed for the $R({D^{(*)}})$ puzzle. We use form factors from lattice QCD to calculate all $Λ_b \to Λ_c τ\barν_τ$ observables. The $Λ_b \to Λ_c$ tensor form factors had not previously been determined in lattice QCD, and we present new lattice results for these form factors here.
description: 44 pages, 105 figures
A one-shot overlapping Schwarz method for component-based model reduction: application to nonlinear elasticity
Creators: name: Iollo, Angelo
name: Sambataro, Giulia
name: Taddei, Tommaso
Publisher: name: arXiv
Year: 2022
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65N30, 41A45, 35J15

description: We propose a component-based (CB) parametric model order reduction (pMOR) formulation for parameterized nonlinear elliptic partial differential equations (PDEs) based on overlapping subdomains. Our approach reads as a constrained optimization statement that penalizes the jump at the components' interfaces subject to the approximate satisfaction of the PDE in each local subdomain. Furthermore, the approach relies on the decomposition of the local states into a port component -- associated with the solution on interior boundaries -- and a bubble component that vanishes at ports: since the bubble components are uniquely determined by the solution value at the corresponding port, we can recast the constrained optimization statement into an unconstrained statement, which reads as a nonlinear least-squares problem and can be solved using the Gauss-Newton method. We present thorough numerical investigations for a two-dimensional neo-Hookean nonlinear mechanics problem to validate our method; we further discuss the well-posedness of the mathematical formulation and the \emph{a priori} error analysis for linear coercive problems.
Post-Keplerian perturbations of the orbital time shift in binary pulsars: an analytical formulation with applications to the Galactic Center
Creators: name: Iorio, Lorenzo
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We develop a general approach to analytically calculate the perturbations $Δδτ_\textrm{p}$ of the orbital component of the change $δτ_\textrm{p}$ of the times of arrival of the pulses emitted by a binary pulsar p induced by the post-Keplerian accelerations due to the mass quadrupole $Q_2$, and the post-Newtonian gravitoelectric (GE) and Lense-Thirring (LT) fields. We apply our results to the so-far still hypothetical scenario involving a pulsar orbiting the Supermassive Black Hole in in the Galactic Center at Sgr A$^\ast$. We also evaluate the gravitomagnetic and quadrupolar Shapiro-like propagation delays $δτ_\textrm{prop}$. By assuming the orbit of the existing S2 main sequence star and a time span as long as its orbital period $P_\textrm{b}$, we obtain $\left|Δδτ_\textrm{p}^\textrm{GE}\right|\lesssim 10^3~\textrm{s},~\left|Δδτ_\textrm{p}^\textrm{LT}\right|\lesssim 0.6~\textrm{s},\left|Δδτ_\textrm{p}^{Q_2}\right|\lesssim 0.04~\textrm{s}$. Faster $\left(P_\textrm{b} = 5~\textrm{yr}\right)$ and more eccentric $\left(e=0.97\right)$ orbits would imply net shifts per revolution as large as $\left|\left\langleΔδτ_\textrm{p}^\textrm{GE}\right\rangle\right|\lesssim 10~\textrm{Ms},~\left|\left\langleΔδτ_\textrm{p}^\textrm{LT}\right\rangle\right|\lesssim 400~\textrm{s},\left|\left\langleΔδτ_\textrm{p}^{Q_2}\right\rangle\right|\lesssim 10^3~\textrm{s}$, depending on the other orbital parameters and the initial epoch. For the propagation delays, we have $\left|δτ_\textrm{prop}^\textrm{LT}\right|\lesssim 0.02~\textrm{s},~\left|δτ_\textrm{prop}^{Q_2}\right|\lesssim 1~μ\textrm{s}$. The expected precision in pulsar timing in Sgr A$^\ast$ is of the order of $100~μ\textrm{s}$, or, perhaps, even $1-10~μ\textrm{s}$.
description: LaTex2e, 2 tables, 4 figures, 36 pages. Entirely rewritten version which corrects previous erroneous results concerning the orbital time delays
BMS Supertranslations and Not So Soft Gravitons
Creators: name: Conde, Eduardo
name: Mao, Pujian
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a previous article, we have argued that Low's sub-leading soft photon theorem can be recovered as a Ward identity associated to the same large gauge transformations that control the leading piece of the theorem. The key for that was to link the energy expansion displayed in the soft theorem to a $\frac{1}{r}$ expansion that we can perform in the associated asymptotic charge. We expect this idea to be valid in general, and here we provide compelling evidence for it by showing how the same method works in the case of Einstein-Hilbert gravity. More precisely, we are able to derive the three orders of the tree-level soft graviton theorem simply from the BMS supertranslation charge, known to give rise to the leading soft graviton theorem. In particular, we do not need to invoke superrotations (nor extended superrotations) at any point of the argument.
description: v2: 26 pages, moderate revision with corrections and clarifications, refs added