last week in physics

730

new preprints about physics in the last week

arXiv

most active server in physics in the last week

black holes

18 preprints

Decomposition of total stress-energy for the generalised Kiselev black hole

We also comment on the presence of energy condition violations (specifically for the null energy condition --- NEC) for certain sub-classes of Kiselev black holes.
5 days ago
arXiv

Thermodynamic Geometry of AdS Black Holes and Black Holes in a Cavity

The thermodynamic geometry has been proved to be quite useful in understanding the microscopic structure of black holes.
5 days ago
arXiv

A model problem for quasinormal ringdown on asymptotically flat or extremal black holes

We consider a wave equation with a potential on the half-line as a model problem for wave propagation close to an extremal horizon, or the asymptotically flat end of a black hole spacetime.
4 days ago
arXiv

magnetic fields

14 preprints

Zero-magnetic-field Hall effects in artificially corrugated bilayer graphene

This new class of condensed-matter systems provides a unique platform to study novel geometrical and/or topological quantum phenomena when both the real-space and momentum-space pseudo-magnetic fields (Berry curvatures) exist.
6 days ago
arXiv

Constraints on primordial magnetic fields from magnetically-induced perturbations: current status and future perspectives with LiteBIRD and future ground based experiments

We present the constraints on the amplitude of magnetic fields generated prior to the recombination using CMB temperature and polarization anisotropy data from Planck 2018 release, alone and in combination with those from BICEP2/Keck array and the South Pole Telescope.
6 days ago
arXiv

Scanning Magnetic Microscope Using A Hall-Effect Sensor for Images of Remanent Magnetization Fields

Scanning magnetic microscopy is a new tool that has recently been used to map magnetic fields with good spatial resolution and field sensitivity.
5 days ago
Preprints.org

state of the art

11 preprints

Entity Summarization: State of the Art and Future Challenges

However, the magnitude of semantic data, in particular the large number of triples describing an entity, could overload users with excessive amounts of information.
4 days ago
arXiv

Meemi: A Simple Method for Post-processing Cross-lingual Word Embeddings

Current state-of-the-art approaches learn these embeddings by aligning two disjoint monolingual vector spaces through an orthogonal transformation which preserves the structure of the monolingual counterparts.
6 days ago
arXiv

Deep Weakly-Supervised Domain Adaptation for Pain Localization in Videos

Experimental results obtained using labeled source domain videos from the RECOLA dataset and weakly-labeled target domain UNBC-McMaster videos indicate that the proposed deep WSDA approach can achieve a significantly higher level of sequence (bag)-level and frame (instance)-level pain localization accuracy than related...
5 days ago
arXiv

many body

11 preprints

Quantum many-body scars from virtual entangled pairs

We study weak ergodicity breaking in a one-dimensional, non-integrable spin-1 XY model.
5 days ago
arXiv

Slow Thermalization of Exact Quantum Many-Body Scar States Under Perturbations

Quantum many-body scar states are exceptional finite energy eigenstates in a thermalizing system that do not satisfy the eigenstate thermalization hypothesis.
6 days ago
arXiv

Observation of quantum many-body effects due to zero point fluctuations in superconducting circuits

This work opens many exciting prospects for longstanding quests such as the tailoring of many-body Hamiltonians in the strongly non-linear regime, the observation of Bloch oscillations, or the development of high-impedance qubits.
4 days ago
arXiv

hall effect

11 preprints

Zero-magnetic-field Hall effects in artificially corrugated bilayer graphene

Such Hall effects are observed in an artificially corrugated bilayer graphene system in which strain and interlayer coupling are specially engineered to induce pseudo-magnetic fields and break the spatial inversion symmetry.
6 days ago
arXiv

Scanning Magnetic Microscope Using A Hall-Effect Sensor for Images of Remanent Magnetization Fields

Here, we describe the construction of a customizing scanning magnetic microscope based on commercial Hall-effect sensors at room temperature that achieves a spatial resolution of 200 µm.
5 days ago
Preprints.org

Thermal Hall effect, spin Nernst effect, and spin density induced by thermal gradient in collinear ferrimagnets from magnon-phonon interaction

We theoretically study the thermal Hall conductivity and spin Nernst effect in collinear ferrimagnets on a honeycomb lattice with broken inversion symmetry between the nearest neighbors.
6 days ago
arXiv

field theory

11 preprints

Fusion and positivity in chiral conformal field theory

Conformal nets and vertex operator algebras are axiomatizations of two-dimensional chiral conformal field theories, both of which have had a significant impact on related mathematical areas of study.
4 days ago
arXiv

Proof of the quantum null energy condition for free fermionic field theories

The quantum null energy condition (QNEC) is a quantum generalization of the null energy condition which gives a lower bound on the null energy in terms of the second derivative of the von Neumann entropy or entanglement entropy of some region with respect to a null direction.
6 days ago
arXiv

The Dynamic Ligand Field of a Molecular Qubit: Decoherence Through Spin–Phonon Coupling

Here we derive a general ligand field theory model to describe and quantify the nature of spin–phonon coupling terms in S = 1/2 transition metal complexes.
1 day ago
chemRxiv

neural networks

10 preprints

Why bigger is not always better: on finite and infinite neural networks

Recent work has shown that the outputs of convolutional neural networks become Gaussian process (GP) distributed when we take the number of channels to infinity.
5 days ago
arXiv

Spiking neural networks trained with backpropagation for low power neuromorphic implementation of voice activity detection

This can be achieved by neuromorphic hardware, which enables Spiking Neural Networks (SNNs) to perform inference at very low energy consumption.
8 hours ago
arXiv

Personalizing Graph Neural Networks with Attention Mechanism for Session-based Recommendation

To this end, we propose a novel method, named Personalizing Graph Neural Networks with Attention Mechanism, A-PGNN for brevity.
3 days ago
arXiv

dark matter

9 preprints

Searching for scalar dark matter with compact mechanical resonators

We explore the viability of laboratory-scale mechanical resonators as detectors for ultralight scalar dark matter.
6 days ago
arXiv

The dark matter component of the Gaia radially anisotropic substructure

For dark matter particle masses below approximately 10 GeV, direct detection exclusion limits for the simulated halos with the anisotropic stellar population show a mild shift towards smaller masses compared to the commonly adopted Standard Halo Model.
6 days ago
arXiv

Multi-Channel Direct Detection of Light Dark Matter: Theoretical Framework

Our results highlight the complementarity between various search channels in probing different kinematic regimes of dark matter scattering, and provide a common reference to connect dark matter theories with ongoing and future direct detection experiments.
5 days ago
arXiv

good agreement

9 preprints

Innovative Strategies for Bearing Lubrication Simulations

The results of the different approaches were compared among them and with experimental observations showing good agreement and reasonable savings in terms of computational effort.
5 days ago
Preprints.org

Deep GMRT 610 MHz Observations of the ELAIS N1 Field : Catalogue and Source Counts

This is the first of a series of papers based on sensitive 610 MHz observations of the ELAIS N1 field using the Giant Metrewave Radio Telescope.
4 days ago
arXiv

Shannon Entropy Applied to the Planar Restricted Three-Body Problem

We find very good agreement in all cases, not only with respect to average values but also in their dispersion for near-by trajectories
5 days ago
arXiv

first principles

9 preprints

Temperature-dependent magnetocrystalline anisotropy of rare earth/transition metal permanent magnets from first principles: The light RCo$_5$ (R=Y, La-Gd) intermetallics

Computational design of more efficient rare earth/transition metal (RE-TM) permanent magnets requires accurately calculating the magnetocrystalline anisotropy (MCA) at finite temperature, since this property places an upper bound on the coercivity.
6 days ago
arXiv

Single Boron Atom Anchored on graphitic carbon nitride nanosheet (B/g-C$_2$N) as a photocatalyst for Nitrogen fixation: A First-Principles Study

Photocatalytic nitrogen reduction is the promising way for ammonia production, the question now is that the search of highly active and low active catalysts.
4 days ago
arXiv

Boron doping in gallium oxide from first principles

We study the feasibility of boron doping in gallium oxide ($\text{Ga}_2\text{O}_3$) for neutron detection. $\text{Ga}_2\text{O}_3$ is a wide band-gap, radiation hard material which has potential for neutron detection if it can be doped with a neutron active element.
6 days ago
arXiv

functional theory

8 preprints

Benchmarking Electronic Structure Methods for Accurate Fixed-Charge Electrostatic Models

We further demonstrate that using computationally inexpensive density functional theory (DFT) methods, together with appropriate augmented basis sets and a continuum solvent model, can yield molecular dipole moments that are both more strongly and more uniformly overpolarized.
1 day ago
chemRxiv

High electrical conductivity in the epitaxial polar metals LaAuGe and LaPtSb

Polar metals are an intriguing class of materials that simultaneously host free carriers and polar structural distortions.
6 days ago
arXiv

Theoretical Examination of Efficiency of Anthocyanidins as Sensitizers in Dye-Sensitized Solar Cells

In this study structural effects and electronic contributions of four anthocyanidins, cyanidin (Cy), delphinidin (Dp), malvidin (Mv) and pelargonidin (Pg), to improve the efficiency of DSSCs were investigated, using quantum chemical method, the density functional theory (DFT), to calculate parameters such as frontier...
1 day ago
chemRxiv

boundary conditions

8 preprints

Poisson CNN: Convolutional Neural Networks for the Solution of the Poisson Equation with Varying Meshes and Dirichlet Boundary Conditions

The Poisson equation is commonly encountered in engineering, including in computational fluid dynamics where it is needed to compute corrections to the pressure field.
4 days ago
arXiv

Revisiting the Casimir Energy with General Boundary Conditions, and applications in 1D Crystals

We obtain new expressions for the Casimir energy between plates that are mimicked by the most general possible boundary conditions allowed by the principles of quantum field theory.
5 days ago
arXiv

H\"older kernel estimates for Robin operators and Dirichlet-to-Neumann operators

Consider the elliptic operator \[ A = - \sum_{k,l=1}^d \partial_k \, c_{kl} \, \partial_l + \sum_{k=1}^d a_k \, \partial_k - \sum_{k=1}^d \partial_k \, b_k + a_0 \] on a bounded connected open set $\Omega \subset {\bf R}^d$ with Lipschitz boundary conditions, where $c_{kl} \in L_\infty(\Omega,{\bf R})$ and $a_k,b_k,a_0 \in L_\infty(\Omega,{\bf...
6 days ago
arXiv

machine learning

8 preprints

Distinguishing between paediatric brain tumour types using multi-parametric magnetic resonance imaging and machine learning: a multi-site study

The results show that diffusion and perfusion weighted imaging of both the tumour and whole brain provide significant features which differ between tumour types, and that combining these features gives the optimal machine learning classifier with greater than 80 percent predictive precision.
1 day ago
arXiv

Predicting the required pre-surgery blood volume in surgical patients based on machine learning

The blood transfusion and surgery related factors of perioperative patients, surgeons experience volumes and the actual volumes of transfused RBCs were extracted. 6 machine learning algorithms were used to build prediction models.
4 days ago
medRxiv

Novel pre-burst stage of gamma-ray bursts from machine learning

Gamma-ray bursts (GRBs), as extremely energetic explosions in the universe, are widely believed to consist of two stages: the prompt phase and the subsequent afterglow.
5 days ago
arXiv

cross sections

7 preprints

Neutrino-nucleus cross sections for W-boson and trident production

The physics of neutrino-nucleus cross sections is a critical probe of the Standard Model and beyond.
5 days ago
arXiv

Interpretation of $Y_b (10753)$ as a tetraquark and its production mechanism

Recently, the Belle Collaboration has updated the analysis of the cross sections for the processes $e^+ e^- \to \Upsilon(nS)\, \pi^+ \pi^-$; $nS = 1S,\, 2S,\, 3S$ in the $e^+ e^-$ center-of-mass energy range from 10.52 to 11.02 GeV, taken at the KEKB asymmetric $e^+ e^-$-collider.
6 days ago
arXiv

Liquid Argon TPC Trigger Development with SBND

Its main physics goals include high-statistics measurements of neutrino-argon interaction cross-sections and searches for sterile neutrino oscillations as part of three LArTPCs that make up the Short Baseline Neutrino (SBN) Program at Fermilab.
5 days ago
arXiv

cosmic ray

7 preprints

CHANG-ES XIV: Cosmic-ray propagation and magnetic field strengths in the radio halo of NGC 4631

NGC 4631 is an interacting galaxy that exhibits one of the largest, gaseous halos observed among edge-on galaxies.
6 days ago
arXiv

Classifying the Cosmic-Ray Proton and Light Groups on the LHAASO-KM2A Experiment with the Graph Neural Network

In this work, we propose a fused Graph Neural Network model in combination of the KM2A arrays, in which the activated detectors are structured into graphs.
6 days ago
arXiv

Toward a robust inference method for the likelihood of low-luminosity gamma-ray bursts to be progenitors of ultrahigh-energy cosmic rays correlating with starburst galaxies

Very recently, the Pierre Auger Collaboration reported a $4.5\sigma$ correlation between the arrival directions of the highest energy cosmic rays and nearby starburst galaxies.
6 days ago
arXiv

spin orbit

7 preprints

Purely interfacial and highly tunable spin-orbit torque operating field-effect transistor in graphene doubly proximitized by two-dimensional magnet Cr$_2$Ge$_2$Te$_6$ and WS$_2$

Using first-principles combined with quantum transport calculations, we predict that graphene sandwiched between insulating monolayers of Cr$_2$Ge$_2$Te$_6$ ferromagnet and WS$_2$ transition-metal dichalcogenide will exhibit spin-orbit torque (SOT) when unpolarized charge current is injected parallel to interfaces of Cr$_2$Ge$_2$Te$_6$/graphene/WS$_2$...
5 days ago
arXiv

Acoustic spin-Chern insulator induced by synthetic spin-orbit coupling with spin conservation breaking

Here, we use a two-dimensional acoustic crystal with two layers to mimic spin-orbit coupling, a crucial ingredient of topological insulators.
6 days ago
arXiv

Walker breakdown with a twist: Dynamics of multilayer domain walls and skyrmions driven by spin-orbit torque

It is shown that such systems generally exhibit a Walker breakdown-like phenomenon in the presence of current-induced damping-like spin-orbit torque.
6 days ago
arXiv

phase transition

7 preprints

A more attractive scheme for radion stabilization and supercooled phase transition

We propose a new radion stabilization mechanism in the Randall-Sundrum spacetime, introducing a bulk ${SU(N_H)}$ gauge field which confines at a TeV scale.
6 days ago
arXiv

Phase transition of capacity for the uniform $G_{\delta}$-sets

We consider a family of dense $G_{\delta}$ subsets of $[0,1]$, defined as intersections of unions of small uniformly distributed intervals, and study their capacity.
6 days ago
arXiv

Finite-temperature topological entanglement entropy for CSS codes

We then consider phase transitions of CSS codes.
6 days ago
arXiv

stellar mass

7 preprints

The Impact of Wind Scalings on Stellar Growth and the Baryon Cycle in Cosmological Simulations

Many phenomenologically successful cosmological galaxy formation simulations employ kinetic winds to model galactic outflows, a crucial ingredient in obtaining predictions that agree with various observations.
5 days ago
arXiv

Testing Galaxy Formation Simulations with Damped Lyman-${\alpha}$ Abundance and Metallicity Evolution

We examine the properties of damped Lyman-${\alpha}$ absorbers (DLAs) emerging from a single set of cosmological initial conditions in two state-of-the-art cosmological hydrodynamic simulations: Simba and Technicolor Dawn.
6 days ago
arXiv

Relativistic Mean Motion Resonance

In particular, pairs of stellar mass black holes surrounding the supermassive black hole could be locked into resonances as they enter the LISA band, and this would affect their gravitational wave waveforms.
6 days ago
arXiv

space time

6 preprints

Waves of space-time from a collapsing compact object

We study the partial time dependent collapse of a spherically symmetric compact object with initial mass $M_1+M_2$ and final mass $M_2$ and the waves of space-time emitted during the collapse via back-reaction effects.
6 days ago
arXiv

An exactly mass conserving space-time embedded-hybridized discontinuous Galerkin method for the Navier-Stokes equations on moving domains

Numerical examples will demonstrate the differences in solution obtained by the space-time EHDG, EDG, and HDG methods.
4 days ago
arXiv

C4 Space-Time.. A Window to New Physics?

By embedding our usual 4-d real space-time in the symplectic 8-d real space-time (symplectic R8 is algebraically isomorphic to C4), we derive the usual geodesic equation of a charged particle in gravitational eld, plus new information which is interpreted.
6 days ago
Preprints.org

gravitational wave

6 preprints

Cross-correlation of the astrophysical gravitational-wave background with galaxy clustering

Our results suggest that the gravitational-wave background when combined with near-future galaxy surveys, is a powerful probe for both gravitational-wave merger physics and cosmology.
4 days ago
arXiv

Gravitational wave stochastic background from cosmological particle decay

The decay produces a stochastic background of gravitational waves because of the "memory effect".
5 days ago
arXiv

Measuring the net circular polarization of the stochastic gravitational wave background with interferometers

Parity violating interactions in the early Universe can source a stochastic gravitational wave background (SGWB) with a net circular polarization.
5 days ago
arXiv

gamma ray

6 preprints

Validation of open-source science tools and background model construction in $\gamma$-ray astronomy

In classical analyses of $\gamma$-ray data from IACTs, such as H.
5 days ago
arXiv

Toward a robust inference method for the likelihood of low-luminosity gamma-ray bursts to be progenitors of ultrahigh-energy cosmic rays correlating with starburst galaxies

Very recently, the Pierre Auger Collaboration reported a $4.5\sigma$ correlation between the arrival directions of the highest energy cosmic rays and nearby starburst galaxies.
6 days ago
arXiv

Novel pre-burst stage of gamma-ray bursts from machine learning

Gamma-ray bursts (GRBs), as extremely energetic explosions in the universe, are widely believed to consist of two stages: the prompt phase and the subsequent afterglow.
5 days ago
arXiv

degrees of freedom

6 preprints

Non-reciprocal hidden degrees of freedom: A unifying perspective on memory, feedback, and activity

Hiding the NR coupled degrees of freedom renders non-Markovian, one-variable Langevin descriptions with complex types of memory, for which we find a generalized second law involving information flow.
4 days ago
arXiv

Unsupervised decoding of spinal motor neuron spike trains for estimating hand kinematics following targeted muscle reinnervation

The results confirm that the proposed decoding approach can directly project the motor neuron spike trains into kinematics for simultaneous and proportional prosthesis control that can be extended to multiple degrees of freedom.
2 days ago
arXiv

Certification of high-dimensional entanglement generated in Hong-Ou-Mandel interference

These results may indicate new paths towards practical exploitation of entanglement stored in multiple degrees of freedom, in particular in the context of high-dimensional quantum information processing protocols.
6 days ago
arXiv

transition metal

6 preprints

MoB2:a new multifunctional transition metal diboride monolayer

It is helpful for the experimentalists to further prepare and utilize the transition metal diboride 2D materials.
6 days ago
arXiv

Computational Screening of Transition Metal /p-block Hybrid Electrocatalysts for CO2 Reduction

We developed thermodynamic volcano plots with two descriptors; CO* and OH* binding free energies and determined the best catalyst material among the initially investigated catalyst materials expecting this plot will provide guidance to the future work on improving the activity of transition metal-p block catalysts for...
16 hours ago
chemRxiv

Temperature-dependent magnetocrystalline anisotropy of rare earth/transition metal permanent magnets from first principles: The light RCo$_5$ (R=Y, La-Gd) intermetallics

Computational design of more efficient rare earth/transition metal (RE-TM) permanent magnets requires accurately calculating the magnetocrystalline anisotropy (MCA) at finite temperature, since this property places an upper bound on the coercivity.
6 days ago
arXiv

neutrino masses

5 preprints

Neutrino masses in an $SU(4)\times U(1)$ -- electroweak model with a scalar decuplet

A neutrino mass model is suggested within an $SU(4)\times U(1)$ -- electroweak theory.
6 days ago
arXiv

Effective neutrino masses in KATRIN and future tritium beta-decay experiments

Furthermore, adopting the Bayesian approach, we present the posterior distributions of the effective neutrino masses by including current experimental information from neutrino oscillations, beta decay, neutrinoless double-beta decay and cosmological observations.
4 days ago
arXiv

A modular $A_4$ symmetry realization of two-zero textures of the Majorana neutrino mass matrix

We show how to realize two-zero textures of the Majorana neutrino mass matrix $M_\nu$ based on modular $A_4$ invariant models without flavons.
5 days ago
arXiv

topological insulator

5 preprints

Transport on a topological insulator surface with a time-dependent magnetic barrier

We study transport across a time-dependent magnetic barrier present on the surface of a three-dimensional topological insulator.
6 days ago
arXiv

Novel self-epitaxy for inducing superconductivity in a topological insulator with a record-high transparency

The seminal proposal by Fu and Kane to use the superconducting proximity effect for engineering a topological superconducting (TSC) state in a topological insulator (TI) has been extended to various materials platforms and pursued by many researchers, with the hope to realize topological quantum computing.
4 days ago
arXiv

Pulsed laser deposition of highly c-axis oriented thin films of BSTS topological insulator

We report the growth of highly c-axis oriented topological insulator (TI) BiSbTe1.5Se1.5 (BSTS) thin films by pulsed laser deposition (PLD) technique.
5 days ago
arXiv