cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Optimising the Data Processing and Quality Assurance strategy in the WSU era
Creators: name: Randall, Suzanna
Publisher: name: Zenodo
Year: 2024

description: The advent of the Wideband Sensitivity Upgrade (WSU) is expected to bring about increased data rates and volumes, posing a substantial challenge to the existing ALMA data processing workflow. In response, significant automation and adaptation will be necessary. This adaptation will involve a shift towards per-Execution Block (EB) calibration, occurring as soon as possible after each observation. It is likely that the current strategy of Quality Assurance (QA2) at the Member ObsUnitSet level will be revised, and that some form of QA will happen at the Group ObsUnitSet level. This entails evaluating combined images from various arrays, incorporating 12-m, 7-m and TP data when needed to fulfill the objectives of the proposed Science Goal. The envisaged changes aim to enhance efficiency and optimise ALMA's science output in the WSU era.
Recovering the number of clusters in data sets with noise features using feature rescaling factors
Creators: name: de Amorim, Renato Cordeiro
name: Hennig, Christian
Publisher: name: arXiv
Year: 2016
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this paper we introduce three methods for re-scaling data sets aiming at improving the likelihood of clustering validity indexes to return the true number of spherical Gaussian clusters with additional noise features. Our method obtains feature re-scaling factors taking into account the structure of a given data set and the intuitive idea that different features may have different degrees of relevance at different clusters. We experiment with the Silhouette (using squared Euclidean, Manhattan, and the p$^{th}$ power of the Minkowski distance), Dunn's, Calinski-Harabasz and Hartigan indexes on data sets with spherical Gaussian clusters with and without noise features. We conclude that our methods indeed increase the chances of estimating the true number of clusters in a data set.
Quantum Thermal Machines Fuelled by Vacuum Forces
Creators: name: Terças, Hugo
name: Ribeiro, Sofia
name: Pezzutto, Marco
name: Omar, Yasser
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We propose a quantum thermal machine composed of two nanomechanical resonators (NMR) (two membranes suspended over a trench in a substrate), placed a few $μ$m from each other. The quantum thermodynamical cycle is powered by the Casimir interaction between the resonators and the working fluid is the polariton resulting from the mixture of the flexural (out-of-plane) vibrations. With the help of piezoelectric cells, we select and sweep the polariton frequency cyclically. We calculate the performance of the proposed quantum thermal machines and show that high efficiencies are achieved thanks to (i) the strong coupling between the resonators and (ii) the large difference between the membrane stiffnesses. Our findings can be of particular importance for applications in nanomechanical technologies where a sensitive control of temperature is needed.
description: Quantum thermal machines, Casimir effect, mechanical resonators, finite-time thermodynamics
Physics and technology system of units for electrodynamics
Creators: name: Ivanov, Mikhail G.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Classical Physics (physics.class-ph)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: FOS: Physical sciences

description: The contemporary practice is to favor the use of the SI units for electric circuits and the Gaussian CGS system for electromagnetic field. A modification of the Gaussian system of units (the Physics and Technology System) is suggested. In the Physics and Technology System the units of measurement for electrical circuits coincide with SI units, and the equations for the electromagnetic field are almost the same form as in the Gaussian system. The XXIV CGMP (2011) Resolution "On the possible future revision of the International System of Units, the SI" provides a chance to initiate gradual introduction of the Physics and Technology System as a new modification of the SI.
description: 12 pages. Misprints in table at page 10 are corrected
Study of potential upgrades for the ALMA Band 7 receiver
Creators: name: Risacher, Christophe
name: Doris Maier
name: Anne-Laure Fontana
name: Sylvain Mahieu
name: Frederic Gueth
name: Karl Schuster
Publisher: name: Zenodo
Year: 2024

description: We will present the work performed during a 2-year feasibility study to assess possible upgrades of the ALMA Band 7 receivers.  The main upgrade goals are to at least double the IF bandwidth from 4-8 GHz to for example 4-20 GHz, to extend the RF bandwidth to have more overlap with ALMA Band 6, and to improve the beam squint, by using orthomode transducers rather than wire grids.  The study was completed in September 2023 and showed full designs for various components which could indeed allow fulfilling most of the new requirements.  We highlight though that performing all these upgrades while keeping as good noise temperature as the current Band 7 will be very challenging.
No Thermal Inversion and a Solar Water Abundance for the Hot Jupiter HD209458b from HST WFC3 Emission Spectroscopy
Creators: name: Line, Michael R.
name: Stevenson, Kevin B.
name: Bean, Jacob
name: Desert, Jean-Michel
name: Fortney, Jonathan J.
name: Kreidberg, Laura
name: Madhusudhan, Nikku
name: Showman, Adam P.
name: Diamond-Lowe, Hannah
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The nature of the vertical thermal structure of hot Jupiter atmospheres is one of the key questions raised by the characterization of transiting exoplanets over the last decade. There have been claims that many hot Jupiter's exhibit vertical profiles with increasing temperature with decreasing pressure in the infrared photosphere that leads to the reversal of molecular absorption bands into emission features (an inversion). However, these claims have been based on broadband photometry rather than the unambiguous identification of emission features with spectroscopy, and the chemical species that could cause the thermal inversions by absorbing stellar irradiation at high altitudes have not been identified despite extensive theoretical and observational effort. Here we present high precision HST WFC3 observations of the dayside emission spectrum of the hot Jupiter HD209458b; the first exoplanet suggested to have a thermal inversion. Our observations resolve a water band in absorption at 6.2 sigma confidence. When combined with Spitzer photometry the data are indicative of a monotonically decreasing temperature with pressure over the range 1-0.001 bar at 7.7 sigma confidence. We test the robustness of our results by exploring a variety of model assumptions including the temperature profile parameterization, presence of a cloud, and choice of Spitzer data reduction. We also introduce a new analysis method, "chemical retrieval-on-retrieval", to determine the elemental abundances from the spectrally retrieved mixing ratios with thermochemical self-consistency and find plausible abundances consistent with solar metallicity (0.06 - 10 x solar) and carbon-to-oxygen ratios less than unity. This work suggests that high-precision spectrophotometric results are required to robustly infer thermal structures and compositions of extra-solar planet atmospheres.
description: submitted to ApJ
An ALMA archival perspective on the evolution of galaxy dynamics
Creators: name: Rizzo, Francesca
Publisher: name: Zenodo
Year: 2024

description: ALMA is bringing us to the forefront of a revolutionary transformation in the field of galaxy formation and evolution, providing observations with high angular and spectral resolution that unveil intricate details of the interstellar medium (ISM) of galaxies over a wide range of cosmic history. This transformative perspective has challenged current galaxy evolution models and has contributed to constructing a nuanced understanding of the evolution of ISM properties and galaxy dynamics. However, even after 10 years of ALMA operation, the archive offers high-resolution observations only for $<$ 50 intrinsically bright or gravitationally lensed galaxies. During this talk, I will discuss the importance of extending studies to the fainter but more abundant star-forming galaxy population. This will be possible thanks to the higher observing efficiency achievable thanks to the Wideband Sensitivity Upgrade.
Einstein-Maxwell-Anti-de-Sitter spinning solitons
Creators: name: Herdeiro, Carlos
name: Radu, Eugen
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Electrostatics on global Anti-de-Sitter (AdS) spacetime is sharply different from that on global Minkowski spacetime. It admits a multipolar expansion with everywhere regular, finite energy solutions, for every multipole moment except the monopole (arXiv:1507.04370). A similar statement holds for global AdS magnetostatics. We show that everywhere regular, finite energy, electric plus magnetic fields exist on AdS in three distinct classes: $(I)$ with non-vanishing total angular momentum $J$; $(II)$ with vanishing $J$ but non-zero angular momentum density, $T^t_φ$; $(III)$ with vanishing $J$ and $T^t_φ$. Considering backreaction, these configurations remain everywhere smooth and finite energy, and we find, for example, Einstein-Maxwell-AdS solitons that are globally - Type I - or locally (but not globally) - Type II - spinning. This backreaction is considered first perturbatively, using analytical methods and then non-perturbatively, by constructing numerical solutions of the fully non-linear Einstein-Maxwell-AdS system. The variation of the energy and total angular momentum with the boundary data is explicitly exhibited for one example of a spinning soliton.
description: 15 pages, 3 figures
Analysis of the ground level enhancements on 14 July 2000 and on 13 December 2006 using neutron monitor data
Creators: name: Mishev, Alexander
name: Usoskin, Ilya
Publisher: name: arXiv
Year: 2016
Subjects: subject: Space Physics (physics.space-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: On the basis of neutron monitor data we estimate the energy spectrum, anisotropy axis direction and pitch-angle distribution of solar energetic particles during two major ground level enhancements (GLE 59 on 14 July 2000 and GLE 70 on 13 December 2006). For the analysis we use a newly computed neutron monitor yield function. The method consists of several consecutive steps: definition of the asymptotic viewing cones of neutron monitor stations considered for the data analysis by computations of cosmic ray particles propagation in a model magnetosphere with the MAGNETOCOSMICS code; computation of the neutron monitor model responses and derivation of the solar energetic particle characteristics on the basis of inverse problem solution. The pitch-angle distribution and rigidity spectrum of high-energy protons are obtained as function of time in the course of ground level enhancements. A comparison with previously reported results is performed and reasonable agreement is achieved. A discussion of the obtained results is included as well their possible application is included.
description: 23 pages, 9 figures, 3 tables; Accepted for publication in Solar Physics
The R_AA and v_2 of muons from heavy-quark decays in Pb+Pb collisions at sqrt(s_NN)=2.76 TeV with the ATLAS detector
Creators: name: Milov, Alexander
Publisher: name: arXiv
Year: 2015
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The ATLAS experiment measures the production of muons coming from the decays of heavy flavour particles in the kinematic interval 4
description: 4 pages, 3 figures
Three-jet production in electron-positron collisions using the CoLoRFulNNLO method
Creators: name: Del Duca, Vittorio
name: Duhr, Claude
name: Kardos, Adam
name: Somogyi, Gábor
name: Trócsányi, Zoltán
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We introduce a subtraction method for jet cross sections at next-to-next-to-leading order (NNLO) accuracy in the strong coupling and use it to compute event shapes in three-jet production in electron-positron collisions. We validate our method on two event shapes, thrust and C-parameter, which are already known in the literature at NNLO accuracy and compute for the first time oblateness and the energy-energy correlation at the same accuracy.
description: 5 pages, 6 figures
Structure and magnetic properties of {\it Ln}MnSbO ({\it Ln} = La and Ce) and CeMnAsO
Creators: name: Zhang, Qiang
name: Kumar, C. M. N.
name: Tian, Wei
name: Dennis, Kevin W.
name: Goldman, Alan I.
name: Vaknin, David
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Neutron powder diffraction (NPD) study of \textit{Ln}MnSbO (\textit{Ln }$=$ La or Ce) reveals differences between the magnetic ground state of the two compounds due to the strong Ce-Mn coupling compared to La-Mn. The two compounds adopt the \textit{P4/nmm} space group down to 2 K and whereas magnetization measurements do not show obvious anomaly at high temperatures, NPD reveals a C-type antiferromagnetic (AFM) order below $T_{\mathrm{N}} = 255 $ K for LaMnSbO and 240 K for CeMnSbO. While the magnetic structure of LaMnSbO is preserved to base temperature, a sharp transition at $T_{\mathrm{SR}} = 4.5 $K is observed in CeMnSbO due to a spin-reorientation (SR) transition of the Mn$^{\mathrm{2+}}$ magnetic moments from pointing along the $c$-axis to the \textit{ab}-plane. The SR transition in CeMnSbO is accompanied by a simultaneous long-range AFM ordering of the Ce moments which indicates that the Mn SR transition is driven by the Ce-Mn coupling. The ordered moments are found to be somewhat smaller than those expected for Mn$^{\mathrm{2+}}$ ($S = 5/2$) in insulators, but large enough to suggest that these compounds belong to the class of local-moment antiferromagnets. The lower $T_{\mathrm{N\thinspace }}$ found in these two compounds compared to the As-based counterparts ($T_{\mathrm{N}} = 317$ for LaMnAsO, $T_{\mathrm{N}} = 347$ K for CeMnAsO) indicates that the Mn-$Pn$ ($Pn=$ As or Sb) hybridization that mediates the superexchange Mn-$Pn$-Mn coupling is weaker for the Sb-based compounds.
A hydrodynamically optimized nano-electrospray ionization source and vacuum interface
Creators: name: Pauly, M.
name: Sroka, M.
name: Reiss, J.
name: Rinke, G.
name: Albarghash, A.
name: Vogelgesang, R.
name: Hahne, H.
name: Kuster, B.
name: Sesterhenn, J.
name: Kern, K.
name: Rauschenbach, S.
Publisher: name: Technische Universität Berlin
Year: 2014
Subjects: subject: 540 Chemie und zugeordnete Wissenschaften

description: The coupling of atmospheric pressure ionization (API) sources like electrospray ionization (ESI) to vacuum based applications like mass spectrometry (MS) or ion beam deposition (IBD) is done by differential pumping, starting with a capillary or pinhole inlet. Because of its low ion transfer efficiency the inlet represents a major bottleneck for these applications. Here we present a nano-ESI vacuum interface optimized to exploit the hydrodynamic drag of the background gas for collimation and the reduction of space charge repulsion. Up to a space charge limit of 40 nA we observe 100% current transmission through a capillary with an inlet and show by MS and IBD experiments that the transmitted ion beams are well defined and free of additional contamination compared to a conventional interface. Based on computational fluid dynamics modelling and ion transport simulations, we show how the specific shape enhances the collimation of the ion cloud. Mass selected ion currents in the nanoampere range available further downstream in high vacuum open many perspectives for the efficient use of electrospray ion beam deposition (ES-IBD) as a surface coating method.
A Cloaking Device for Transiting Planets
Creators: name: Kipping, David M.
name: Teachey, Alex
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: The transit method is presently the most successful planet discovery and characterization tool at our disposal. Other advanced civilizations would surely be aware of this technique and appreciate that their home planet's existence and habitability is essentially broadcast to all stars lying along their ecliptic plane. We suggest that advanced civilizations could cloak their presence, or deliberately broadcast it, through controlled laser emission. Such emission could distort the apparent shape of their transit light curves with relatively little energy, due to the collimated beam and relatively infrequent nature of transits. We estimate that humanity could cloak the Earth from Kepler-like broadband surveys using an optical monochromatic laser array emitting a peak power of about 30 MW for roughly 10 hours per year. A chromatic cloak, effective at all wavelengths, is more challenging requiring a large array of tunable lasers with a total power of approximately 250 MW. Alternatively, a civilization could cloak only the atmospheric signatures associated with biological activity on their world, such as oxygen, which is achievable with a peak laser power of just around 160 kW per transit. Finally, we suggest that the time of transit for optical SETI is analogous to the water-hole in radio SETI, providing a clear window in which observers may expect to communicate. Accordingly, we propose that a civilization may deliberately broadcast their technological capabilities by distorting their transit to an artificial shape, which serves as both a SETI beacon and a medium for data transmission. Such signatures could be readily searched in the archival data of transit surveys.
description: 10 pages, 6 figures, accepted in MNRAS
Quantum teleportation across a metropolitan fibre network
Creators: name: Valivarthi, Raju
name: Puigibert, Marcel. li Grimau
name: Zhou, Qiang
name: Aguilar, Gabriel H.
name: Verma, Varun B.
name: Marsili, Francesco
name: Shaw, Matthew D.
name: Nam, Sae Woo
name: Oblak, Daniel
name: Tittel, Wolfgang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: If a photon interacts with a member of an entangled photon pair via a so-called Bell-state measurement (BSM), its state is teleported over principally arbitrary distances onto the second member of the pair. Starting in 1997, this puzzling prediction of quantum mechanics has been demonstrated many times; however, with one very recent exception, only the photon that received the teleported state, if any, travelled far while the photons partaking in the BSM were always measured closely to where they were created. Here, using the Calgary fibre network, we report quantum teleportation from a telecommunication-wavelength photon, interacting with another telecommunication photon after both have travelled over several kilometres in bee-line, onto a photon at 795~nm wavelength. This improves the distance over which teleportation takes place from 818~m to 6.2~km. Our demonstration establishes an important requirement for quantum repeater-based communications and constitutes a milestone on the path to a global quantum Internet.
The ALMA Science Archive, a reprocessing service and a science enabling infrastructure in the WSU era
Creators: name: Stoehr, Felix
Publisher: name: Zenodo
Year: 2024

description: The WSU will come with a large increase in the overall data-rate. The data volume will pose substantial challenges for astronomers to access, to recalibrate, reimage, and recombine the data according to their needs as well as to analyze the products. We describe the coming and planed developments for the ALMA Science Archive to allow astronomers to better deal with the WSU ALMA data and thus maximise the science return for the observatory.
Spatio-Temporal Analysis of Team Sports -- A Survey
Creators: name: Gudmundsson, Joachim
name: Horton, Michael
Publisher: name: arXiv
Year: 2016
Subjects: subject: Other Computer Science (cs.OH)
subject: FOS: Computer and information sciences
subject: A.1; H.2.8

description: Team-based invasion sports such as football, basketball and hockey are similar in the sense that the players are able to move freely around the playing area; and that player and team performance cannot be fully analysed without considering the movements and interactions of all players as a group. State of the art object tracking systems now produce spatio-temporal traces of player trajectories with high definition and high frequency, and this, in turn, has facilitated a variety of research efforts, across many disciplines, to extract insight from the trajectories. We survey recent research efforts that use spatio-temporal data from team sports as input, and involve non-trivial computation. This article categorises the research efforts in a coherent framework and identifies a number of open research questions.
description: 42 pages, 11 figures
Flavor-changing decays of the top quark in 5D warped models
Creators: name: Diaz-Furlong, Alfonso
name: Frank, Mariana
name: Pourtolami, Nima
name: Toharia, Manuel
name: Xoxocotzi, Reyna
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study flavor changing neutral current decays of the top quark in the context of general warped extra dimensions, where the five dimensional metric is slightly modified from 5D anti-de-Sitter (AdS$_5$). These models address the Planck-electroweak hierarchies of the Standard Model $and$ can obey all the low energy flavor bounds and electroweak precision tests, while allowing the scale of new physics to be at the TeV level, and thus within the reach of the LHC at Run II. We perform the calculation of these exotic top decay rates for the case of a bulk Higgs, and thus include in particular the effect of the additional Kaluza-Klein (KK) Higgs modes running in the loops, along with the usual KK fermions and KK gluons.
description: 29 pages, 6 figures
Dual Position Sensitive MWPC for tracking reaction products at VAMOS++
Creators: name: Vandebrouck, Marine
name: Lemasson, Antoine
name: Rejmund, Maurycy
name: Fremont, Georges
name: Pancin, Julien
name: Navin, Alahari
name: Michelagnoli, Caterina
name: Goupil, Johan
name: Spitaels, Charles
name: Jacquot, Bertrand
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The characteristics and performance of a Dual Position Sensitive Multi-Wire Proportional Counter (DPS-MWPC) used to measure the scattering angle, interaction position on the target and the velocity of reaction products, detected in the VAMOS++ magnetic spectrometer, are reported. The detector consists of a pair of position sensitive low pressure MWPCs and provides both fast timing signals, along with the two-dimensional position coordinates required to define the trajectory of the reaction products. A time-of-flight resolution of 305(11) ps (FWHM) was measured. The measured resolutions (FWHM) were 2.5(3) mrad and 560(70) μm for the scattering angle and the interaction point at the target respectively. The subsequent improvement of the Doppler correction of the energy of the gamma-rays, detected in the gamma-ray tracking array AGATA in coincidence with isotopically identified ions in VAMOS++, is also discussed.
description: Accepted for publication in Nuclear Inst. and Methods in Physics Research, A
Impact of WSU on Spectral Index Determination and Calibration Methods
Creators: name: Tafoya, Daniel
name: Carmen Toribio
name: Sebastien Muller
name: Sabine König
name: Tobia Carozzi
Publisher: name: Zenodo
Year: 2024

description: Impact of WSU on Spectral Index Determination and Calibration Methods Poster abstract: The Wideband Sensitivity Upgrade (WSU) promises to revolutionise ALMA's performance, particularly enhancing spectral index (alpha) determination and expanding calibration strategies. This poster highlights the significant advancements introduced by the WSU, focusing on its impact on the precision of alpha measurements and the calibration methods.  The expanded frequency range and the wider bandwidth provided by the WSU will be instrumental in reducing the uncertainty of alpha measurements, which introduces a new realm of flux calibration possibilities. Also, the larger continuum bandwidth in ALMA observations raises the SNR of calibrator gain solutions, enabling the use of fainter, closer quasars as phase calibrators. This is especially beneficial in high-frequency (HF) bands, where accuracy in phase transfer is critical due to larger relative antenna position errors. Moreover, the increased SNR allows for more precise calibration of narrow spectral windows, providing greater resilience against instrumental drifts. It also opens up the potential for shorter calibration cycles, reducing residual phase errors, particularly important for long baseline and HF observations. Lastly, the WSU's broader bandwidth makes continuum self-calibration feasible for a larger number of science targets, significantly mitigating residual antenna position errors even when the SNR is low. This represents a major step forward in achieving higher accuracy and efficiency in astronomical research.
Probing Planet Forming Zones with Rare CO Isotopologues
Creators: name: Yu, Mo
name: Willacy, Karen
name: Dodson-Robinson, Sarah E.
name: Turner, Neal J.
name: Evans, Neal J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The gas near the midplanes of planet-forming protostellar disks remains largely unprobed by observations due to the high optical depth of commonly observed molecules such as CO and H$_2$O. However, rotational emission lines from rare molecules may have optical depths near unity in the vertical direction, so that the lines are strong enough to be detected, yet remain transparent enough to trace the disk midplane. Here we present a chemical model of an evolving T-Tauri disk and predict the optical depths of rotational transitions of $^{12}$C$^{16}$O, $^{13}$C$^{16}$O, $^{12}$C$^{17}$O and $^{12}$C$^{18}$O. The MRI-active disk is primarily heated by the central star due to the formation of the dead zone. CO does not freeze out in our modeled region within $70$AU around a sunlike star. However, the abundance of CO decreases because of the formation of complex organic molecules (COM), producing an effect that can be misinterpreted as the "snow line". These results are robust to variations in our assumptions about the evolution of the gas to dust ratio. The optical depths of low-order rotational lines of C$^{17}$O are around unity, making it possible to see into the disk midplane using C$^{17}$O. Combining observations with modeled C$^{17}$O$/$H$_2$ ratios, like those we provide, can yield estimates of protoplanetary disks' gas masses.
description: Accepted for publication in ApJ
Topological phases: Classification of topological insulators and superconductors of non-interacting Fermions, and beyond
Creators: name: Ludwig, Andreas W. W.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: After briefly recalling the quantum entanglement-based view of topological phases of matter in order to outline the general context, we give an overview of different approaches to the classification problem of topological insulators and superconductors of non-interacting Fermions. In particular, we review in some detail general symmetry aspects of the "ten-fold way" which forms the foundation of the classification, and put different approaches to the classification in relationship with each other. We end by briefly mentioning some of the results obtained on the effect of interactions, mainly in three spatial dimensions.
description: 32 pages
Compiler Design Using Flex & Bison
Creators: name: Shanto, Sanaul Haque
Publisher: name: Zenodo
Year: 2023

description: A compiler is a program that translates a source program written in a high-level programming language into machine code for some computer architecture. The generated machine code can be later executed many times against different data each time. In my lab, I have learn how to design a simple compiler with flex and bison. At first, I learn how to use flex. Then I learn about bison. After combining both, I try to make a simple compiler. So, the final outcome of this lab is a simple compiler with flex and bison.
Diagnostic of the unstable envelopes of Wolf-Rayet stars
Creators: name: Grassitelli, Luca
name: Chene', Andre-Nicolas
name: Sanyal, Debashis
name: Langer, Norbert
name: Louis, Nicole St.
name: Bestenlehner, Joachim
name: Fossati, Luca
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The envelopes of stars near the Eddington limit are prone to various instabilities. A high Eddington factor in connection with the Fe opacity peak leads to convective instability, and a corresponding envelope inflation may induce pulsational instability. Here, we investigate the occurrence and consequences of both instabilities in models of Wolf-Rayet stars. We determine the convective velocities in the sub-surface convective zones to estimate the amplitude of the turbulent velocity at the base of the wind that potentially leads to the formation of small-scale wind structures, as observed in several WR stars. We also investigate the effect of mass loss on the pulsations of our models. We approximated solar metallicity WR stars by models of mass-losing helium stars, and we characterized the properties of convection in the envelope adopting the standard MLT. Our results show the occurrence of sub-surface convective regions in all studied models. Small surface velocity amplitudes are predicted for models with masses below 10Msun. For models with M>10Msun, the surface velocity amplitudes are of the order of 10km/s. Moreover we find the occurrence of pulsations for stars in the mass range 9-14Msun, while mass loss appears to stabilize the more massive WR stars. We confront our results with observationally derived line variabilities of 17 WN stars. The data suggest variability to occur for stars above 10Msun, which is increasing linearly with mass above this value, in agreement with our results. We further find some of our models to be unstable to radial pulsations, and predict local magnetic fields of the order of hundreds of Gauss in WR stars more massive than 10Msun. Our study relates the surface velocity fluctuations induced by sub-surface convection to the formation of clumping in the inner part of the wind. From this mechanism, we expect a stronger variability in more massive WR stars.
description: A&A, accepted
Two-Dimensionally Confined Topological Edge States in Photonic Crystals
Creators: name: Barik, Sabyasachi
name: Miyake, Hirokazu
name: DeGottardi, Wade
name: Waks, Edo
name: Hafezi, Mohammad
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present an all-dielectric photonic crystal structure that supports two-dimensionally confined helical topological edge states. The topological properties of the system are controlled by the crystal parameters. An interface between two regions of differing band topologies gives rise to topological edge states confined in a dielectric slab that propagate around sharp corners without backscattering. Three dimensional finite-difference time-domain calculations show these edges to be confined in the out-of-plane direction by total internal reflection. Such nanoscale photonic crystal architectures could enable strong interactions between photonic edge states and quantum emitters.
A way to distinguish very compact stellar objects from black holes
Creators: name: Akhmedov, Emil T.
name: Kalinov, Daniil A.
name: Popov, Fedor K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a way to distinguish compact stellar object, whose size is very close to its Schwarzschild radius, from the collapsing stars. Namely, we show that {\it massive} fields in the vicinity of a very compact stellar object have discrete energy levels. (These levels are different from the standard non-relativistic ones present in Coulomb type of potentials and from the quasinormal modes.) At the same time we show that there are no such discrete levels for massive fields in the vicinity of a collapsing star.
description: 11 pages, 2 figures; the version to appear in PRD; references added
The Raman Fingerprint of Quartz
Creators: name: Sparavigna, Amelia Carolina
Publisher: name: Zenodo
Year: 2023
Subjects: Raman spectroscopy
Tsallis q-Gaussian distribution.
First derivative spectrum

description: Here we consider a processing method for Raman spectra, suitable to determine the positions of the peaks and their shoulders. This processing is based on the behavior of the first derivative. It can be used as a preprocessing method for a further fitting of the spectrum by means of Tsallis q-Gaussian functions (Sparavigna, 2023). The spectra considered are those of Quartz from RRUFF database.
Diphotons from an Electroweak Triplet-Singlet
Creators: name: Howe, Kiel
name: Knapen, Simon
name: Robinson, Dean J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The neutral component of a real pseudoscalar electroweak (EW) triplet can produce a diphoton excess at 750 GeV, if it is somewhat mixed with an EW singlet pseudoscalar. This triplet-singlet mixing allows for greater freedom in the diboson branching ratios than the singlet-only case, but it is still possible to probe the parameter space extensively with 300 fb$^{-1}$. The charged component of the triplet is pair-produced at the LHC, which results in a striking signal in the form of a pair of $Wγ$ resonances with an irreducible rate of 0.27 fb. Other signatures include multiboson final states from cascade decays of the triplet-singlet neutral states. A large class of composite models feature both EW singlet and triplet pseudo-Nambu Goldstone bosons in their spectrum, with the diboson couplings generated by axial anomalies.
description: 36 pages, 7 figures
Vertex Operators for Irregular Conformal Blocks: Supersymmetric Case
Creators: name: Polyakov, Dimitri
name: Rim, Chaiho
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct supersymmetric irregular vertex operators of arbitrary rank, appearing in the colliding limit of primary fields. We find that the structure of the supersymmetric irregular vertices differs significantly from the bosonic case: upon supersymmetrization, the irregular operators are no longer the eigenstates of positive Virasoro and $W_N$ generators but block-diagonalize them. We relate the block-diagonal structure of the irregular vertices to contributions of the Ramond sector to the colliding limit.
Supplementary material
Creators: name: Monge García, Manuel Ignacio
name: Jiang, Zhongping
name: Hatib, Feras
name: Settels, Jos
name: Cecconi, Maurizio
name: R. Pinsky, Michael
Publisher: name: figshare
Year: 2022
Subjects: Cardiology (incl. cardiovascular diseases)

description: Supplementary material for "Effects of intraventricular mechanical dyssynchrony assessed by conductance catheter on systolic and diastolic left ventricular performance: an in vivo experimental study during variations in loading and contractile conditions" by Monge García MI, Jian Z, Hatib F, Settels JJ, Cecconi M, and Pinsky MR
Supplementary Material from Using self-affirmation to increase intellectual humility in debate
Creators: name: Hanel, Paul H. P.
name: Roy, Deborah
name: Taylor, Samuel
name: Franjieh, Michael
name: Heffer, Chris
name: Tanesini, Alessandra
name: Maio, Gregory R.
Publisher: name: The Royal Society
Year: 2023
Subjects: subject: 179999 Psychology and Cognitive Sciences not elsewhere classified
subject: FOS: Psychology

description: Intellectual humility, which entails openness to other views and a willingness to listen and engage with them, is crucial for facilitating civil dialogue and progress in debate between opposing sides. In the present research, we tested whether intellectual humility can be reliably detected in discourse and experimentally increased by a prior self-affirmation task. Three hundred and three participants took part in 116 audio- and video-recorded group discussions. Blind to condition, linguists coded participants' discourse to create an intellectual humility score. As expected, the self-affirmation task increased the coded intellectual humility, as well as participants’ self-rated prosocial affect (e.g. empathy). Unexpectedly, the effect on prosocial affect did not mediate the link between experimental condition and intellectual humility in debate. Self-reported intellectual humility and other personality variables were uncorrelated with expert-coded intellectual humility. Implications of these findings for understanding the social psychological mechanisms underpinning intellectual humility are considered.
Mixed trTLEP-structures and mixed Frobenius structures
Creators: name: Shamoto, Yota
Publisher: name: arXiv
Year: 2015
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: We introduce the notion of mixed trTLEP-structures and prove that a mixed trTLEP-structure with some conditions naturally induces a mixed Frobenius manifold. This is a generalization of the reconstruction theorem of Hertling and Manin. As a special case, we also show that a graded polarizable variation of mixed Hodge structure with $H^2$-generation condition gives rise to a family of mixed Frobenius manifolds. It implies that there exist mixed Frobenius manifolds associated to local B-models.
description: 34 pages
Arithmetic of singular character varieties and their $E$-polynomials
Creators: name: Baraglia, David
name: Hekmati, Pedram
Publisher: name: arXiv
Year: 2016
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: Primary 14D20, 32S35, Secondary 20C15, 14L30

description: We calculate the $E$-polynomials of the $SL_3(\mathbb{C})$ and $GL_3(\mathbb{C})$-character varieties of compact oriented surfaces of any genus and the $E$-polynomials of the $SL_2(\mathbb{C})$ and $GL_2(\mathbb{C})$-character varieties of compact non-orientable surfaces of any Euler characteristic. Our methods also give a new and significantly simpler computation of the $E$-polynomials of the $SL_2(\mathbb{C})$-character varieties of compact orientable surfaces, which were computed by Logares, Muñoz and Newstead for genus $g=1,2$ and by Martinez and Muñoz for $g \ge 3$. Our technique is based on the arithmetic of character varieties over finite fields. More specifically, we show how to extend the approach of Hausel and Rodriguez-Villegas used for non-singular (twisted) character varieties to the singular (untwisted) case.
description: 41 pages
The ALMA 2030 Data Challenges - preparing the user community and the ARCs for the future
Creators: name: Toribio, Carmen
name: Sabine König
name: Sebastien Muller
name: Daniel Tafoya
name: Tobia Carozzi
Publisher: name: Zenodo
Year: 2024

description: The ALMA 2030 Data Challenges - preparing the user community and the ARCs for the future
Betschart, Christof: "Unwiederholbares Gottessiegel"
Creators: name: Gerl-Falkovitz, Hanna-Barbara
Publisher: name: Edith Stein Jahrbuch
Year: 2025

description: 1839515651
description: Edith Stein Jahrbuch, V. 20 (2014): Edith Stein Jahrbuch, Band 20
Rivers in the sky: streamers as catalysts for physical and chemical changes in protostars and disks
Creators: name: Valdivia, Teresa
Publisher: name: Zenodo
Year: 2024

description: Streamers, infalling gaseous structures ranging from a few hundred to over 10,000 astronomical units, have been identified as a new method of supplying material to protostellar and protoplanetary disks, thanks to recent high-resolution observations with ALMA and NOEMA. To date, about 30 streamers have been discovered at various stages of star formation. However, the full impact of these ``rivers in the sky'' on our understanding of star and planet formation remains unclear. It is still uncertain which molecules best trace these structures, and the effects of this infall on the disk itself and its interaction with the protostar are just beginning to be investigated using high-resolution ALMA observations. In this presentation, I'll share our most recent findings about streamers, particularly from the NOEMA large program PRODIGE. I'll discuss their impact on the physical and chemical conditions of the disk, and explore the new and exciting possibilities the ALMA WSU will open. ALMA is a critical tool for detecting these structures, and the increased bandwidth and quicker integration times will help us identify the most effective streamer-tracing molecules, examine the shocks generated at their landing sites in disks, and potentially reveal their structure in dust emission.
Spin-catalyzed hopping conductivity in disordered strongly interacting quantum wires
Creators: name: Parameswaran, S. A.
name: Gopalakrishnan, Sarang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In one-dimensional electronic systems with strong repulsive interactions, charge excitations propagate much faster than spin excitations. Such systems therefore have an intermediate temperature range [termed the "spin-incoherent Luttinger liquid'" (SILL) regime] where charge excitations are "cold" (i.e., have low entropy) whereas spin excitations are "hot." We explore the effects of charge-sector disorder in the SILL regime in the absence of external sources of equilibration. We argue that the disorder localizes all charge-sector excitations; however, spin excitations are protected against full localization, and act as a heat bath facilitating charge and energy transport on asymptotically long timescales. The charge, spin, and energy conductivities are widely separated from one another. The dominant carriers of energy are neither charge nor spin excitations, but neutral "phonon" modes, which undergo an unconventional form of hopping transport that we discuss. We comment on the applicability of these ideas to experiments and numerical simulations.
description: 14 pages, 6 figures
From cold cores to protostars: the promises of WSU
Creators: name: Vastel, Charlotte
Publisher: name: Zenodo
Year: 2024

description: Molecular complexity in the earliest phases of star-forming regions will be presented in this talk. I will present recent results obtained with ALMA in the proto-typical prestellar core, L1544, and the proto-ninary system BHB07-11. The Atomis tool (ALMA Archive TOol for Molecular Investigations in Space: https://atomis.irap.omp.eu/) developped at IRAP will also be presented to the ALMA community to select in the ALMA archive observations of selected species towards the selected source.
Hidden cusps
Creators: name: Coste, Michel
name: Wenger, Philippe
name: Chablat, Damien
Publisher: name: arXiv
Year: 2016
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper investigates a situation pointed out in a recent paper, in which a non-singular change of assembly mode of a planar 2-RPR-PR parallel manipulator was realized by encircling a point of multiplicity 4. It is shown that this situation is, in fact, a non-generic one and gives rise to cusps under a small perturbation. Furthermore , we show that, for a large class of singularities of multiplicity 4, there are only two types of stable singularities occurring in a small perturbation: these two types are given by the complex square mapping and the quarto mapping. Incidentally , this paper confirms the fact that, generically, a local non-singular change of solution must be accomplished by encircling a cusp point.
Stellar Streams and Clouds in the Galactic Halo
Creators: name: Grillmair, Carl J.
name: Carlin, Jeffrey L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recent years have seen the discovery of an ever growing number of stellar debris streams and clouds. These structures are typically detected as extended and often curvilinear overdensities of metal-poor stars that stand out from the foreground disk population. The streams typically stretch tens of degrees or more across the sky, even encircling the Galaxy, and range in heliocentric distance from 3 to 100 kpc. This chapter summarizes the techniques used for finding such streams and provides tables giving positions, distances, velocities, and metallicities, where available, for all major streams and clouds that have been detected as of January 2015. Sky maps of the streams are also provided. Properties of individual tidal debris structures are discussed.
description: 27 pages, 6 figures, Book chapter in Tidal Streams in the Local Group and Beyond, eds. Heidi Newberg and Jeff Carlin
Seed Conformal Blocks in 4D CFT
Creators: name: Echeverri, Alejandro Castedo
name: Elkhidir, Emtinan
name: Karateev, Denis
name: Serone, Marco
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute in closed analytical form the minimal set of "seed" conformal blocks associated to the exchange of generic mixed symmetry spinor/tensor operators in an arbitrary representation (l,\bar l) of the Lorentz group in four dimensional conformal field theories. These blocks arise from 4-point functions involving two scalars, one (0,|l-\bar l|) and one (|l-\bar l|,0) spinors or tensors. We directly solve the set of Casimir equations, that can elegantly be written in a compact form for any (l,\bar l), by using an educated ansatz and reducing the problem to an algebraic linear system. Various details on the form of the ansatz have been deduced by using the so called shadow formalism. The complexity of the conformal blocks depends on the value of p=|l-\bar l | and grows with p, in analogy to what happens to scalar conformal blocks in d even space-time dimensions as d increases. These results open the way to bootstrap 4-point functions involving arbitrary spinor/tensor operators in four dimensional conformal field theories.
description: 38 pages, 4 figures; v2: references added, typo in the final eqs.(5.36) and (5.37) fixed (sorry)