cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quasinormal modes of scalar and Dirac perturbations of Bardeen de-Sitter black holes
Creators: name: Wahlang, Wadbor
name: Jeena, Piyush A.
name: Chakrabarti, S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: So far the study of black hole perturbations has been mostly focussed upon the classical black holes with singularities at the origin and hidden by event horizon. Compared to that, the regular black holes are a completely new class of solutions arising out of modification of general theory of relativity by coupling gravity to an external form of matter. Therefore it is extremely important to study the behaviour of such regular black holes under different types of perturbations. Recently a new regular Bardeen black hole solution with a de Sitter branch has been proposed by Fernando. We compute the quasi-normal (QN) frequencies for the regular Bardeen de Sitter (BdS) black hole due to massless and massive scalar field perturbations as well as the massless Dirac perturbations. We analyze the behaviour of both real and imaginary parts of quasinormal frequencies by varying different parameters of the theory.
description: 10+1 pages, 25 figures, Accepted to be published in International Journal of Modern Physics D
Proof of Factorization of $χ_{cJ}$ Production in Non-Equilibrium QCD at RHIC and LHC in Color Singlet Mechanism
Creators: name: Nayak, Gouranga C
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Recently we have proved the factorization of NRQCD S-wave heavy quarkonium production at all orders in coupling constant. In this paper we extend this to prove the factorization of infrared divergences in $χ_{cJ}$ production from color singlet $c{\bar c}$ pair in non-equilibrium QCD at RHIC and LHC at all orders in coupling constant. This can be relevant to study the quark-gluon plasma at RHIC and LHC.
description: Final Version, Accepted for Publication in Journal of Theoretical and Applied Physics, 19 pages latex
Supersymmetric Rényi Entropy and Defect Operators
Creators: name: Nishioka, Tatsuma
name: Yaakov, Itamar
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We describe the defect operator interpretation of the supersymmetric Renyi entropies of superconformal field theories in three, four and five dimensions. The operators involved are supersymmetric codimension-two defects in an auxiliary Z_n gauge theory coupled to n copies of the SCFT. We compute the exact expectation values of such operators using localization, and compare the results to the supersymmetric Renyi entropy. The agreement between the two implies a relationship between the partition function on a squashed sphere and the one on a round sphere in the presence of defects.
description: 45 pages, 1 figure
Two-Dimensional Homogeneous Fermi Gases
Creators: name: Hueck, Klaus
name: Luick, Niclas
name: Sobirey, Lennart
name: Siegl, Jonas
name: Lompe, Thomas
name: Moritz, Henning
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We report on the experimental realization of homogeneous two-dimensional (2D) Fermi gases trapped in a box potential. In contrast to harmonically trapped gases, these homogeneous 2D systems are ideally suited to probe local as well as non-local properties of strongly interacting manybody systems. As a first measurement, we use a local probe to extract the equation of state (EOS) of a non-interacting Fermi gas. We then perform matter wave focusing to extract its momentum distribution and directly observe Pauli blocking in a near unity occupation of momentum states. Finally, we measure the momentum distribution of strongly interacting homogeneous 2D gases in the crossover between attractively interacting fermions and deeply-bound bosonic molecules.
description: Main text: 6 pages, 4 figures. Supplementary Material: 4 pages, 5 figures. This version: Updated to reflect the changes made in the published version
On the multipliers of repelling periodic points of entire functions
Creators: name: Bergweiler, Walter
name: Liu, Dan
Publisher: name: arXiv
Year: 2017
Subjects: subject: Complex Variables (math.CV)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37F10, 30D05

description: We give a lower bound for the multipliers of repelling periodic points of entire functions. The bound is deduced from a bound for the multipliers of fixed points of composite entire functions.
description: 19 pages; minor revision of v1
Class attendance, peer similarity, and academic performance in a large field study
Creators: name: Kassarnig, Valentin
name: Bjerre-Nielsen, Andreas
name: Mones, Enys
name: Lehmann, Sune
name: Lassen, David Dreyer
Publisher: name: arXiv
Year: 2017
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Identifying the factors that determine academic performance is an essential part of educational research. Existing research indicates that class attendance is a useful predictor of subsequent course achievements. The majority of the literature is, however, based on surveys and self-reports, methods which have well-known systematic biases that lead to limitations on conclusions and generalizability as well as being costly to implement. Here we propose a novel method for measuring class attendance that overcomes these limitations by using location and bluetooth data collected from smartphone sensors. Based on measured attendance data of nearly 1,000 undergraduate students, we demonstrate that early and consistent class attendance strongly correlates with academic performance. In addition, our novel dataset allows us to determine that attendance among social peers was substantially correlated ($>$0.5), suggesting either an important peer effect or homophily with respect to attendance.
title: Unified field
title: The balance in the chaos
titleType: Other
Creators: name: Martin, Daniel
Publisher: name: Zenodo
Year: 2025

description: Dear reader 

I am pleased to submit my manuscript titled "A New Electrostatic Model of Gravitational Pull: Gravity as an

Emergent Effect of Electromagnetic and Charge Equilibrium Systems" for your consideration. This paper

introduces a new theoretical framework in which gravity is modelled not as a fundamental force produced by

mass, but as an emergent phenomenon arising from the electrostatic and electromagnetic interactions within

and around planetary bodies.

The model is supported by original equations - including a final form, Equation 6 (ESP-G)-that incorporate

planetary magnetic moment, density, radius, and storm-based charge modulation. These equations are

validated using known data from Earth, Venus, Jupiter, and several moons, accurately matching gravitational

observations, including cases where classical models struggle.

A key contribution of this work is the proposed relationship between subatomic particle structure (particularly

neutron and proton density) and gravitational field coupling. The model also offers explanations for natural

phenomena - such as static-driven insect flight, pre-lightning uplift, and lunar tide modulation - that classical

mass-based theories cannot fully address.This work has been developed independently and in collaboration with OpenAI's ChatGPT for computational

modelling, drafting support, and planetary data analysis. I believe the theory offers a fresh, testable approach

to understanding gravity and opens a pathway toward unified field models integrating gravitational, electric, and

magnetic forces.

Thank you for considering this manuscript for publication. I certify that this submission is original, not under

consideration elsewhere, and free of conflicts of interest. I would welcome peer review and am happy to address

any revisions or experimental inquiries that arise.

Sincerely,

Daniel John Martin
Collisional Fragmentation is Not a Barrier to Close-in Planet Formation
Creators: name: Wallace, Joshua
name: Tremaine, Scott
name: Chambers, John
Publisher: name: arXiv
Year: 2017
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Collisional fragmentation is shown to not be a barrier to rocky planet formation at small distances from the host star. Simple analytic arguments demonstrate that rocky planet formation via collisions of homogeneous gravity-dominated bodies is possible down to distances of order the Roche radius ($r_\mathrm{Roche}$). Extensive N-body simulations with initial bodies ${\gtrsim}1700$ km that include plausible models for fragmentation and merging of gravity-dominated bodies confirm this conclusion and demonstrate that rocky planet formation is possible down to ${\sim}$1.1 $r_\mathrm{Roche}$. At smaller distances, tidal effects cause collisions to be too fragmenting to allow mass build-up to a final, dynamically stable planetary system. We argue that even differentiated bodies can accumulate to form planets at distances that are not much larger than $r_\mathrm{Roche}$.
description: 15 pages, 9 figures, accepted for publication in AJ; revised version after addressing referee comments
Iron-based superconductivity extended to the novel silicide LaFeSiH
Creators: name: Bernardini, F.
name: Garbarino, G.
name: Sulpice, A.
name: Núñez-Regueiro, M.
name: Gaudin, E.
name: Chevalier, B.
name: Méasson, M. -A.
name: Cano, A.
name: Tencé, S.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report the synthesis and characterization of the novel silicide LaFeSiH displaying superconductivity with onset at 11 K. We find that this pnictogen-free compound is isostructural to LaFeAsO, with a similar low-temperature tetragonal to orthorhombic distortion. Using density functional theory we show that this system is also a multiband metal in which the orthorhombic distortion is likely related to single-stripe antiferromagnetic order. Electrical resistivity and magnetic susceptibility measurements reveal that these features occur side-by-side with superconductivity, which is suppressed by external pressure.
description: 5 + epsilon pages, 7 figures, Supplemental Material on demand; v2 includes additional magnetization and resistivity data; v3 includes additional resistivity data from LaFeSiH single crystal
Diffusion and signatures of localization in stochastic conformal field theory
Creators: name: Bernard, Denis
name: Doyon, Benjamin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We define a simple model of conformal field theory in random space-time environments, which we refer to as stochastic conformal field theory. This model accounts for the effects of dilute random impurities in strongly interacting critical many-body systems. On one hand, surprisingly, although impurities are separated by macroscopic distances, we find that the infinite-time steady state is factorized on microscopic lengths, a signature of the emergence of localization. The stationary state also displays vanishing energy current and strong uncorrelated spatial fluctuations of local observables. On the other hand, at finite times, the transient shows a crossover from ballistic to diffusive energy propagation. In this regime and a Markovian limit, concentrating on current-generating initial states with a temperature imbalance, we show that the energy current and density satisfy simple dissipative hydrodynamic equations. We describe the space-time scales at which non-equilibrium currents exist. We show that a light-cone effect subsists in the presence of impurities although a momentum burst propagates transiently on a diffusive scale only.
description: 5 pages + 4 pages suppl. mat., 2 figures. V2: discussion improved
Evidence for universality in the initial planetesimal mass function
Creators: name: Simon, Jacob B.
name: Armitage, Philip J.
name: Youdin, Andrew N.
name: Li, Rixin
Publisher: name: arXiv
Year: 2017
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Planetesimals may form from the gravitational collapse of dense particle clumps initiated by the streaming instability. We use simulations of aerodynamically coupled gas-particle mixtures to investigate whether the properties of planetesimals formed in this way depend upon the sizes of the particles that participate in the instability. Based on three high resolution simulations that span a range of dimensionless stopping time $6 \times 10^{-3} \leq τ\leq 2$ no statistically significant differences in the initial planetesimal mass function are found. The mass functions are fit by a power-law, ${\rm d}N / {\rm d}M_p \propto M_p^{-p}$, with $p=1.5-1.7$ and errors of $Δp \approx 0.1$. Comparing the particle density fields prior to collapse, we find that the high wavenumber power spectra are similarly indistinguishable, though the large-scale geometry of structures induced via the streaming instability is significantly different between all three cases. We interpret the results as evidence for a near-universal slope to the mass function, arising from the small-scale structure of streaming-induced turbulence.
description: 7 pages, 4 figures, accepted to ApJ Letters after minor modifications, including two new figures and some new text that better clarify our results
A quantum causal discovery algorithm
Creators: name: Giarmatzi, Christina
name: Costa, Fabio
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Finding a causal model for a set of classical variables is now a well-established task---but what about the quantum equivalent? Even the notion of a quantum causal model is controversial. Here, we present a causal discovery algorithm for quantum systems. The input to the algorithm is a process matrix describing correlations between quantum events. Its output consists of different levels of information about the underlying causal model. Our algorithm determines whether the process is causally ordered by grouping the events into causally-ordered non-signaling sets. It detects if all relevant common causes are included in the process, which we label Markovian, or alternatively if some causal relations are mediated through some external memory. For a Markovian process, it outputs a causal model, namely the causal relations and the corresponding mechanisms, represented as quantum states and channels. Our algorithm provides a first step towards more general methods for quantum causal discovery.
description: 11 pages, 10 figures, revised to match published version
Quantum gates by inverse engineering of a Hamiltonian
Creators: name: Santos, Alan C.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Inverse engineering of Hamiltonian (IEH) from an evolution operator is a useful technique for protocol of quantum control with potential applications in quantum information processing. In this paper we introduce a particular protocol to perform IEH and we show how this scheme can be used for implementing a set of quantum gates by using minimal quantum resources (such as entanglement, interactions between more than two quits or auxiliary quits). Remarkably, while previous protocols request three-quits interactions and/or auxiliary quits for implementing such gates, our protocol requires just two-qubit interactions and no auxiliary qubits. By using this approach, we can obtain a large class of Hamiltonians that allow us to implement single and two-quit gates necessary to quantum computation. To conclude this article, we analyze the performance of our scheme against systematic errors related to amplitude noise, where we show that the free parameters introduced in our scheme can be useful for enhancing the robustness of the protocol against such errors.
description: Please, see published version (V4): 14 pages, 2 figures
Polaron-induced phonon localization and stiffening in rutile TiO$_2$
Creators: name: Kolesov, Grigory
name: Kolesov, Boris A.
name: Kaxiras, Efthimios
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Small polaron formation in transition metal oxides, like the prototypical material rutile TiO$_2$, remains a puzzle and a challenge to simple theoretical treatment. In our combined experimental and theoretical study, we examine this problem using Raman spectroscopy of photo-excited samples and real-time time-dependent density functional theory (RT-TDDFT), which employs Ehrenfest dynamics to couple the electronic and ionic subsystems. We observe experimentally the unexpected stiffening of the $A_{1g}$ phonon mode under UV illumination and provide a theoretical explanation for this effect. Our analysis also reveals a possible reason for the observed anomalous temperature-dependence of the Hall mobility. Small polaron formation in rutile TiO$_2$ is a strongly non-adiabatic process and is adequately described by Ehrenfest dynamics at time scales of polaron formation.
COMCIFS/cif_core: CIF Core March 2020
Creators: name: Bollinger, John
name: Hall, Sydney
name: Hester, James
name: Merkys, Andrius
name: Spadaccini, Nick
name: Vaitkus, Antanas
Publisher: name: Zenodo
Year: 2020

description: CIF core dictionary together with template dictionaries and attribute dictionary as of March 2020.
Long geodesics on convex surfaces
Creators: name: Akopyan, Arseniy
name: Petrunin, Anton
Publisher: name: arXiv
Year: 2017
Subjects: subject: Differential Geometry (math.DG)
subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 53-01, 53C45, 52A15, 53A05

description: We review the theory of intrinsic geometry of convex surfaces in the Euclidean space and prove the following theorem: if the surface of a convex body K contains arbitrary long closed simple geodesics, then K is an isosceles tetrahedron.
description: 8 pages, 10 figures
Learning Edge Representations via Low-Rank Asymmetric Projections
Creators: name: Abu-El-Haija, Sami
name: Perozzi, Bryan
name: Al-Rfou, Rami
Publisher: name: arXiv
Year: 2017
Subjects: subject: Machine Learning (cs.LG)
subject: Social and Information Networks (cs.SI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We propose a new method for embedding graphs while preserving directed edge information. Learning such continuous-space vector representations (or embeddings) of nodes in a graph is an important first step for using network information (from social networks, user-item graphs, knowledge bases, etc.) in many machine learning tasks. Unlike previous work, we (1) explicitly model an edge as a function of node embeddings, and we (2) propose a novel objective, the "graph likelihood", which contrasts information from sampled random walks with non-existent edges. Individually, both of these contributions improve the learned representations, especially when there are memory constraints on the total size of the embeddings. When combined, our contributions enable us to significantly improve the state-of-the-art by learning more concise representations that better preserve the graph structure. We evaluate our method on a variety of link-prediction task including social networks, collaboration networks, and protein interactions, showing that our proposed method learn representations with error reductions of up to 76% and 55%, on directed and undirected graphs. In addition, we show that the representations learned by our method are quite space efficient, producing embeddings which have higher structure-preserving accuracy but are 10 times smaller.
Non null controllability of the Grushin equation in 2D
Creators: name: Koenig, Armand
Publisher: name: arXiv
Year: 2017
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 93B05 (Primary) 93B07, 93C20, 35K65, 30A10, 34L15 (Secondary)

description: We are interested in the exact null controllability of the equation $\partial_t f - \partial_x^2 f - x^2 \partial_y^2f = \mathbf 1_ωu$, with control $u$ supported on $ω$. We show that, when $ω$ does not intersect a horizontal band, the considered equation is never null-controllable. The main idea is to interpret the associated observability inequality as an $L^2$ estimate on entire functions, which Runge's theorem disproves. To that end, we study in particular the first eigenvalue of the operator $-\partial_x^2 + (nx)^2$ with Dirichlet conditions on $(-1,1)$ and we show a quite precise estimation it satisfies, even when $n$ is in some complex domain.
Transport Waves as Crystal Excitations
Creators: name: Cepellotti, Andrea
name: Marzari, Nicola
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We introduce the concept of transport waves by showing that the linearized Boltzmann transport equation admits excitations in the form of waves that have well defined dispersion relations and decay times. Crucially, these waves do not represent single-particle excitations, but are collective excitations of the equilibrium distribution functions. We study in detail the case of thermal transport, where relaxons are found in the long-wavelength limit, and second sound is reinterpreted as the excitation of one or several temperature waves at finite frequencies. Graphene is studied numerically, finding decay times of the order of microseconds. The derivation, obtained by a spectral representation of the Boltzmann equation, holds in principle for any crystal or semiclassical transport theory and is particularly relevant when transport takes place in the hydrodynamic regime.
The Ergodicity Landscape of Quantum Theories
Creators: name: Ho, Wen Wei
name: Radicevic, Djordje
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: High Energy Physics - Theory (hep-th)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: This paper is a physicist's review of the major conceptual issues concerning the problem of spectral universality in quantum systems. Here we present a unified, graph-based view of all archetypical models of such universality (billiards, particles in random media, interacting spin or fermion systems). We find phenomenological relations between the onset of ergodicity (Gaussian-random delocalization of eigenstates) and the structure of the appropriate graphs, and we construct a heuristic picture of summing trajectories on graphs that describes why a generic interacting system should be ergodic. We also provide an operator-based discussion of quantum chaos and propose criteria to distinguish bases that can usefully diagnose ergodicity. The result of this analysis is a rough but systematic outline of how ergodicity changes across the space of all theories with a given Hilbert space dimension. As a special case, we study the SYK model and report on the transition from maximal to partial ergodicity as the disorder strength is decreased.
description: 56 pages, many figures
Learning with Errors is easy with quantum samples
Creators: name: Grilo, Alex B.
name: Kerenidis, Iordanis
name: Zijlstra, Timo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Computational Complexity (cs.CC)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Learning with Errors is one of the fundamental problems in computational learning theory and has in the last years become the cornerstone of post-quantum cryptography. In this work, we study the quantum sample complexity of Learning with Errors and show that there exists an efficient quantum learning algorithm (with polynomial sample and time complexity) for the Learning with Errors problem where the error distribution is the one used in cryptography. While our quantum learning algorithm does not break the LWE-based encryption schemes proposed in the cryptography literature, it does have some interesting implications for cryptography: first, when building an LWE-based scheme, one needs to be careful about the access to the public-key generation algorithm that is given to the adversary; second, our algorithm shows a possible way for attacking LWE-based encryption by using classical samples to approximate the quantum sample state, since then using our quantum learning algorithm would solve LWE.
A non-varying phenomenon with an application to the wind-tree model
Creators: name: Pardo, Angel
Publisher: name: arXiv
Year: 2017
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We exhibit a non-varying phenomenon for the counting problem of cylinders, weighted by their area, passing through two marked (regular) Weierstrass points of a translation surface in a hyperelliptic connected component $\mathcal{H}^{hyp}(2g-2)$ or $\mathcal{H}^{hyp}(g-1,g-1)$, $g > 1$. As an application, we obtain the non-varying phenomenon for the counting problem of (weighted) periodic trajectories on the classical wind-tree model, a billiard in the plane endowed with $\mathbb{Z}^2$-periodically located identical rectangular obstacles.
description: 14 pages, 3 figure. Mayor revision: Sections 3 and 4 from former version are treated uniformly on Section 3 of the new version, by working directly on the sphere (referee observation). Minor mistake on the counterexamples section corrected and new examples provided
First constraints on fuzzy dark matter from Lyman-$α$ forest data and hydrodynamical simulations
Creators: name: Iršič, Vid
name: Viel, Matteo
name: Haehnelt, Martin G.
name: Bolton, James S.
name: Becker, George D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present constraints on the masses of extremely light bosons dubbed fuzzy dark matter from Lyman-$α$ forest data. Extremely light bosons with a De Broglie wavelength of $\sim 1$ kpc have been suggested as dark matter candidates that may resolve some of the current small scale problems of the cold dark matter model. For the first time we use hydrodynamical simulations to model the Lyman-$α$ flux power spectrum in these models and compare with the observed flux power spectrum from two different data sets: the XQ-100 and HIRES/MIKE quasar spectra samples. After marginalization over nuisance and physical parameters and with conservative assumptions for the thermal history of the IGM that allow for jumps in the temperature of up to $5000\rm\,K$, XQ-100 provides a lower limit of 7.1$\times 10^{-22}$ eV, HIRES/MIKE returns a stronger limit of 14.3$\times 10^{-22}$ eV, while the combination of both data sets results in a limit of 20 $\times 10^{-22}$ eV (2$σ$ C.L.). The limits for the analysis of the combined data sets increases to 37.5$\times 10^{-22}$ eV (2$σ$ C.L.) when a smoother thermal history is assumed where the temperature of the IGM evolves as a power-law in redshift. Light boson masses in the range $1-10 \times10^{-22}$ eV are ruled out at high significance by our analysis, casting strong doubts that FDM helps solve the "small scale crisis" of the cold dark matter models.
description: 7 pages, 3 figures; supplemental material: 2 pages, 3 figures
Stacked Average Far-Infrared Spectrum of Dusty Star-Forming Galaxies from the Herschel/SPIRE Fourier Transform Spectrometer
Creators: name: Wilson, Derek
name: Cooray, Asantha
name: Nayyeri, Hooshang
name: Bonato, Matteo
name: Bradford, Charles M.
name: Clements, David L.
name: De Zotti, Gianfranco
name: Díaz-Santos, Tanio
name: Farrah, Duncan
name: Magdis, Georgios
name: Michałowski, Michał J.
name: Pearson, Chris
name: Rigopoulou, Dimitra
name: Valtchanov, Ivan
name: Wang, Lingyu
name: Wardlow, Julie
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present stacked average far-infrared spectra of a sample of 197 dusty, star-forming galaxies (DSFGs) at $0.005 < z < 4$ using close to 90% of the SPIRE Fourier Transform Spectrometer (FTS) extragalactic data archive from the Herschel Space Observatory based on 3.5 years of science operations. These spectra explore an observed-frame $\rm 447\,GHz-1568\,GHz$ ($\rm 191\,μm-671\,μm$) frequency (wavelength) range allowing us to observe the main atomic and molecular lines emitted by gas in the interstellar medium. The sample is sub-divided into five redshift bins at $0.005 < z < 0.05$, $0.05 < z < 0.2$, $0.2 < z < 0.5$, $0.8 < z <2$, and $2 < z < 4$. To study the dependence of observed spectral lines on total infrared luminosity, the sources in a subset of the redshift bins are stacked in luminosity bins. These stacked spectra are used to determine the average properties of the interstellar medium and dense molecular gas properties of DSFGs, in particular, the fine-structure line ([CII] 158 $μ$m and [OI] 63 $μ$m) luminosity ratios, and the line to far-IR luminosity ratios are used to model the gas density and radiation field strength in the photodissociation regions (PDRs). For the low-redshift sample, we additionally present the average spectral line energy distributions (SLED) of CO and $\rm{H_2O}$ rotational transitions and also consider PDR conditions based on a combination of [CI] 370 $μ$m and 609 $μ$m and $\rm CO (7-6)$ lines. For the high-z ($0.8 < z < 4$) sample PDR models suggest a molecular gas distribution in the presence of a radiation field that is at least a factor of 10$^3$ larger than the Milky-Way and with a neutral gas density of roughly 10$^3$ to 10$^5$ cm$^{-3}$. The corresponding PDR models for the low-z sample suggest a UV radiation field and gas density comparable to those at high-z.
description: 30 pages, 19 figures
Bad Metals from Fluctuating Density Waves
Creators: name: Delacrétaz, Luca V.
name: Goutéraux, Blaise
name: Hartnoll, Sean A.
name: Karlsson, Anna
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Bad metals have a large resistivity without being strongly disordered. In many bad metals the Drude peak moves away from zero frequency as the resistivity becomes large at increasing temperatures. We catalogue the position and width of the `displaced Drude peak' in the observed optical conductivity of several families of bad metals, showing that $ω_\text{peak} \sim Δω\sim k_BT/\hbar$. This is the same quantum critical timescale that underpins the $T$-linear dc resistivity of many of these materials. We provide a unified theoretical description of the optical and dc transport properties of bad metals in terms of the hydrodynamics of short range quantum critical fluctuations of incommensurate density wave order. Within hydrodynamics, pinned translational order is essential to obtain the nonzero frequency peak.
description: 8+4+5 pages. 3 figures. v2: references added, discussion improved. v3: presentation revamped to emphasize main points. v4: minor tweaks to presentation and data points for more materials added. v5: minor revised version for SciPost
Field equations for Lovelock gravity: An alternative route
Creators: name: Chakraborty, Sumanta
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present an alternative derivation of the gravitational field equations for Lovelock gravity starting from the Newton's law, which is closer in spirit to the thermodynamic description of gravity. As a warm up exercise, we have explicitly demonstrated that projecting the Riemann curvature tensor appropriately and taking a cue from Poisson's equation, the Einstein's equations immediately follow. The above derivation naturally generalizes to Lovelock gravity theories where an appropriate curvature tensor satisfying the symmetries as well as the Bianchi derivative properties of the Riemann tensor has to be used. Interestingly, in the above derivation, the thermodynamic route to gravitational field equations, suited for null hypersurfaces, emerge quiet naturally.
description: Invited Article; 11 pages, no figures
Covariant Generalized Holographic Dark Energy and Accelerating Universe
Creators: name: Nojiri, Shin'ichi
name: Odintsov, S. D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We proposed the generalized holographic dark energy model where infrared cutoff is identified with the combination of the FRW universe parameters: the Hubble rate, particle and future horizons, cosmological constant, the universe life-time (if finite) and their derivatives. It is demonstrated that with the corresponding choice of the cutoff one can map such holographic dark energy to modified gravity or gravity with general fluid. Explicitly, F(R) gravity and general perfect fluid are worked out in detail and corresponding infrared cutoff is found. Using this correspondence, we get realistic inflation or viable dark energy or unified inflationary-dark energy universe in terms of covariant holographic dark energy.
description: LaTeX 9 pages, version to appear in EPJC
Majorana states in prismatic core-shell nanowires
Creators: name: Manolescu, Andrei
name: Sitek, Anna
name: Osca, Javier
name: Serra, Llorenç
name: Gudmundsson, Vidar
name: Stanescu, Tudor D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider core-shell nanowires with conductive shell and insulating core, and with polygonal cross section. We investigate the implications of this geometry on Majorana states expected in the presence of proximity-induced superconductivity and an external magnetic field. A typical prismatic nanowire has a hexagonal profile, but square and triangular shapes can also be obtained. The low-energy states are localized at the corners of the cross section, i.e. along the prism edges, and are separated by a gap from higher energy states localized on the sides. The corner localization depends on the details of the shell geometry, i.e. thickness, diameter, and sharpness of the corners. We study systematically the low-energy spectrum of prismatic shells using numerical methods and derive the topological phase diagram as a function of magnetic field and chemical potential for triangular, square, and hexagonal geometries. A strong corner localization enhances the stability of Majorana modes to various perturbations, including the orbital effect of the magnetic field, whereas a weaker localization favorizes orbital effects and reduces the critical magnetic field. The prismatic geometry allows the Majorana zero-energy modes to be accompanied by low-energy states, which we call pseudo Majorana, and which converge to real Majoranas in the limit of small shell thickness. We include the Rashba spin-orbit coupling in a phenomenological manner, assuming a radial electric field across the shell.
description: 14 pages, 16 figures, accepted for publication in Phys. Rev. B
The Mass-Energy Gravity Model: A Fundamental Alternative to Dark Matter
Creators: name: Shreenan-Dyck, Chris
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 490204
subject: Mathematical aspects of general relativity

description: This paper introduces the Mass-Energy Gravity (MEG) framework, a paradigm-shifting alternative to ΛCDM that eliminates the need for dark matter in explaining galaxy dynamics and gravitational lensing. MEG is built on a reinterpretation of the speed of light (c)—not just as a velocity limit, but as a fundamental constraint on energy-density concentration, leading to the derivation of a maximum energy-density limit called the Unified Limit (U).
By replacing spacetime curvature with energy-density gradients (EDGs), MEG explains gravitational effects as emergent from mass-energy redistribution rather than intrinsic warping of spacetime. This paper rigorously derives three key relativistic effects—Mercury’s precession, frame-dragging, and gravitational time dilation—from first principles, confirming that all independently predict the same value of U.Using this foundation, MEG successfully reproduces flat galaxy rotation curves and gravitational lensing effects, including Einstein Rings and the Bullet Cluster, without invoking dark matter halos. Additionally, U is found to match black hole density and describe neutron star stability, providing a natural resolution to singularity formation in General Relativity.This work demonstrates that MEG offers a fully self-consistent, observationally validated alternative to ΛCDM, providing a new perspective on gravity and large-scale cosmic structure without requiring dark matter.

For inquiries, please contact me at: chris.sd.mail@gmail.com
A First Law of Entanglement Rates from Holography
Creators: name: O'Bannon, Andy
name: Probst, Jonas
name: Rodgers, Ronnie
name: Uhlemann, Christoph F.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: For a perturbation of the state of a Conformal Field Theory (CFT), the response of the entanglement entropy is governed by the so-called "first law" of entanglement entropy, in which the change in entanglement entropy is proportional to the change in energy. Whether such a first law holds for other types of perturbations, such as a change to the CFT Lagrangian, remains an open question. We use holography to study the evolution in time $t$ of entanglement entropy for a CFT driven by a $t$-linear source for a conserved $U(1)$ current or marginal scalar operator. We find that although the usual first law of entanglement entropy may be violated, a first law for the rates of change of entanglement entropy and energy still holds. More generally, we prove that this first law for rates holds in holography for any asymptotically $(d+1)$-dimensional Anti-de Sitter metric perturbation whose $t$ dependence first appears at order $z^d$ in the Fefferman-Graham expansion about the boundary at $z=0$.
description: 20 pages + 1 appendix, v2: version accepted to Phys. Rev. D
SL(2,Z)-action for ribbon quasi-Hopf algebras
Creators: name: Farsad, Vanda
name: Gainutdinov, Azat M.
name: Runkel, Ingo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We study the universal Hopf algebra L of Majid and Lyubashenko in the case that the underlying ribbon category is the category of representations of a finite dimensional ribbon quasi-Hopf algebra A. We show that L=A* with coadjoint action and compute the Hopf algebra structure morphisms of L in terms of the defining data of A. We give explicitly the condition on A which makes Rep(A) factorisable and compute Lyubashenko's projective SL(2,Z)-action on the centre of A in this case. The point of this exercise is to provide the groundwork for the applications to ribbon categories arising in logarithmic conformal field theories - in particular symplectic fermions and W_p-models - and to test a conjectural non-semisimple Verlinde formula.
description: 62 pages; v2: corrected inaccuracies in section 4.4 and proposition 5.3, references changed, v3: minor changes, inaccuracies in Prop 4.5, Cor 5.5 fixed, improvements in Sec 7.6 and Rem 7.10, refs updated
Smoothing and filtering with a class of outer measures
Creators: name: Houssineau, Jeremie
name: Bishop, Adrian N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: 60A10, 60J05, 62L12

description: Filtering and smoothing with a generalised representation of uncertainty is considered. Here, uncertainty is represented using a class of outer measures. It is shown how this representation of uncertainty can be propagated using outer-measure-type versions of Markov kernels and generalised Bayesian-like update equations. This leads to a system of generalised smoothing and filtering equations where integrals are replaced by supremums and probability density functions are replaced by positive functions with supremum equal to one. Interestingly, these equations retain most of the structure found in the classical Bayesian filtering framework. It is additionally shown that the Kalman filter recursion can be recovered from weaker assumptions on the available information on the corresponding hidden Markov model.
Indigenous yeasts from rose oil distillation wastewater and their capacity for biotransformation of phenolics
Creators: name: Rusanova, Mila
name: Rusanov, Krasimir
name: Butterweck, Veronika
name: Atanassov, Ivan
Publisher: name: MDPI
Year: 2023
Subjects: subject: 600 - Technik, Medizin, angewandte Wissenschaften

description: The indigenous yeasts associated with the spontaneous fermentation of phenolic-rich rose oil distillation wastewater (RODW) generated after the industrial distillation of rose oil were studied. The ITS-rDNA sequence analysis of the samples collected from RODW fermented at semi-sterile conditions, a waste deposition lagoon and endophytic yeasts isolated from industrially cultivated Rosa damascena suggests that the spontaneous RODW fermentation is caused by yeasts from the genus Cyberlindnera found also as endophytes in the rose flowers. Phylogenetic analysis based on the nucleotide sequences of the translation elongation factor (TEF1α) and 18S- and 26S- rRNA genes further confirmed the taxonomic affiliation of the RODW yeast isolates with the genus Cyberlindnera. The RODW fermentation capacity of a selected set of indigenous yeast isolates was studied and compared with those of common yeast strains. The indigenous yeast isolates demonstrated a superior growth rate, resulting in a nearly double reduction in the phenolic content in the fermented RODW. The indigenous yeasts’ fermentation changed the RODW phenolics’ composition. The levels of some particular phenolic glycosides decreased through the depletion and fermentation of their sugar moiety. Hence, the relative abundance of the corresponding aglycons and other phenolic compounds increased. The capacity for the biotransformation of RODW phenolics by indigenous yeasts is discussed.
Dirac Magnon Nodal Loops in Quasi-2D Quantum Magnets
Creators: name: Owerre, S. A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In this report, we propose a new concept of one-dimensional (1D) closed lines of Dirac magnon nodes in two-dimensional (2D) momentum space of quasi-2D quantum magnetic systems. They are termed "2D Dirac magnon nodal-line loops". We utilize the bilayer honeycomb ferromagnets with intralayer coupling $J$ and interlayer coupling $J_L$, which is realizable in the honeycomb chromium compounds CrX$_3$ (X $\equiv$ Br, Cl, and I). However, our results can also exist in other layered quasi-2D quantum magnetic systems. Here, we show that the magnon bands of the bilayer honeycomb ferromagnets overlap for $J_L\neq 0$ and form 1D closed lines of Dirac magnon nodes in 2D momentum space. The 2D Dirac magnon nodal-line loops are topologically protected by inversion and time-reversal symmetry. Furthermore, we show that they are robust against weak Dzyaloshinskii-Moriya interaction $ Δ_{DM}< J_L$ and possess chiral magnon edge modes.}
description: 10 pages, 7 figures. Accepted to Scientific Reports
Pomponia lactea
Creators: name: Boulard, Michel
Publisher: name: Zenodo
Year: 2001
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadidae
Pomponia
Pomponia lactea

description: 6. - Pomponia lactea (Distant, 1887) Leptopsaltria lactea Distant, 1887; Pomponia lactea Distant, 1891. Belle espèce se situant dans les tailles moyennes inférieures (39 mm de longueur totale et 30 mm de longueur du corps, pour 73 mm d'envergure) dont la livrée entremêle le bistre au vert clair sur l'avant-corps, tandis que l'abdomen est entièrement marron. Les ailes sont hyalines, les homélytres portant des taches surlignant assez largement de brun plus ou moins sombre les nervures et nervules fermant les cellules ulnaires, tandis que des macules ponctuent l'extrémité de toutes les nervures de l'aire apicale (fig. 2, H). Pomponia lactea est une espèce principalement crépusculaire; les mâles émettent une cymbalisation d'appel nuptial immédiatement reconnaissable, chaque séquence étant com¬ posée de plusieurs phrases grésillées d'une façon qui leur est particulière. La figure 8 reproduit la C. I. A. de cette espèce. a: oscillogramme temporel transcrivant en temps réel 30 s du plein appel comportant deux séquences très semblables, mais inégales en durées (respectivement 12,65 s et9,2 s) séparées par des silences de 6 à 7 s. b: oscillogramme obtenu pourun temps arbitraire, transcrivant et amplifiant 3 s du plein signal prélevées au niveau de la plage inversée en a, et mettant en évidence la structure fusiforme des premières phrases de la cymbalisation. c: spectrogramme étiré conforme à l'oscillogramme b. Le fondamental, très bas en fréquence (1600 Hz) est aussi peu énergétique, presque discret; il est renforcé par des harmoniques très serrés et s'élevant en fréquence jusqu'à un peu plus de 17 000 Hz, avec une gamme efficace entre 4 500 et 1 1 000 Hz. d: letracéduspectremoyenconfirmelarichesseenharmoniques,toutenprécisantlaprédominance de trois groupes. Femelle et accouplement non vus.
description: Published as part of Boulard, Michel, 2001, Statut acoustique et comportement sonore de quelques Cigales thaïlandaises. Description d'une espèce nouvelle (Homoptera, Cicadidae), pp. 127-147 in Bulletin de la Société entomologique de France 106 (2) on pages 138-139, DOI: 10.3406/bsef.2001.16740, http://zenodo.org/record/7129367
description: {"references": ["- 1889 / 1891. - A Monograph ofOriental Cicadidae. The Trustees of the Indian Museum, Calcutta andLondon: 1 - 48, 49 - 96."]}
Spin-singlet superconductivity in doped topological crystalline insulator Sn_{0.96}In_{0.04}Te
Creators: name: Maeda, S.
name: Hirose, R.
name: Matano, K.
name: Novak, M.
name: Ando, Y.
name: Zheng, G. -q.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The In-doped topological crystalline insulator Sn_{1-x}In_xTe is a candidate for a topological superconductor, where pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn_{1-x}In_xTe, we perform ^{125}Te-nuclear magnetic resonance (NMR) measurements in polycrystalline samples with 0< x <0.15. The penetration depth calculated from the NMR line width is T-independent below half the superconducting transition temperature (T_c) in polycrystalline Sn_{0.96}In_{0.04}Te, which indicates a fully-opened superconducting gap. In this sample, the spin susceptibility measured by the spin Knight shift (K_s) at an external magnetic field of H_0 = 0.0872 T decreases below T_c, and K_s(T=0)/K_s(T=T_c) reaches to 0.36 \pm 0.10, which is far below the limiting value 2/3 expected for a spin-triplet state for a cubic crystal structure. Our result indicates that polycrystalline Sn_{0.96}In_{0.04}Te is a spin-singlet superconductor.
description: 10 pages, 5 figures