Tootfinder

Real-time bubble nucleation and growth for false vacuum decay on the lattice
Daan Maertens, Jutho Haegeman, Karel Van Acoleyen
https://arxiv.org/abs/2508.13645 https://

Real-time bubble nucleation and growth for false vacuum decay on the lattice
We revisit quantum false vacuum decay for the one-dimensional Ising model, focusing on the real-time nucleation and growth of true vacuum bubbles. Via matrix product state simulations, we demonstrate that for a wide range of parameters, the full time-dependent quantum state is well described by a Gaussian ansatz in terms of domain wall operators, with the associated vacuum bubble wave function evolving according to the linearized time-dependent variational principle. The emerging picture shows …

Entropy, purity and gluon cascades at high energies with recombinations and transitions to vacuum
Krzysztof Kutak, Micha{\l} Prasza{\l}owicz
https://arxiv.org/abs/2508.13781 htt…

Entropy, purity and gluon cascades at high energies with recombinations and transitions to vacuum
We study one dimensional dipole cascade models in the high-energy limit of QCD. Motivated by data on hadron multiplicities in the LHCb kinematical range, we generalize existing cascade models for splitting and recombination to account also for transitions to the vacuum. This modification allows us to describe the data. Furthermore, we perform both analytical and numerical studies of the cascades and find that the cascade including loop corrections, as well as the one accounting for transitions …

Trapping and cooling of nanodiamonds in a Paul trap under ultra-high vacuum: Towards matter-wave interferometry with massive objects
Omer Feldman, Ben Baruch Shultz, Maria Muretova, Or Dobkowski, Yonathan Japha, David Grosswasser, Ron Folman
https://arxiv.org/abs/2508.14687

Trapping and cooling of nanodiamonds in a Paul trap under ultra-high vacuum: Towards matter-wave interferometry with massive objects
Quantum mechanics (QM) and General relativity (GR), also known as the theory of gravity, are the two pillars of modern physics. A matter-wave interferometer with a massive particle can test numerous fundamental ideas, including the spatial superposition principle - a foundational concept in QM - in previously unexplored regimes. It also opens the possibility of probing the interface between QM and GR, such as testing the quantization of gravity. Consequently, there exists an intensive effort to…

Many-body theory of false vacuum decay in quantum spin chains
Christian Johansen, Alessio Recati, Iacopo Carusotto, Alberto Biella
https://arxiv.org/abs/2508.13780 https://

Many-body theory of false vacuum decay in quantum spin chains
In this work we theoretically investigate the false vacuum decay process in a ferromagnetic quantum spin-1/2 chain. We develop a many-body theory describing the nucleation and the coherent dynamics of true-vacuum bubbles that is analytically tractable and agrees with numerical matrix product state calculations in all parameter regimes up to intermediate times. This bosonic theory allows us to identify different regimes in the parameter space and unravel the underlying physical mechanisms. In pa…

Vacuum bubble and fissure formation in collective motion with competing attractive and repulsive forces
Olivia Clifton, Angel Chavez, Antonio Madrigal, Annie Warren, Paige Yeung, Arnd Scheel
https://arxiv.org/abs/2508.14827

Vacuum bubble and fissure formation in collective motion with competing attractive and repulsive forces
We study the continuum limit of the motion of agents in the plane driven by competing short-range repulsion and long-range attractive forces. At a critical parameter value, we find destabilization of a trivial branch of uniformly distributed solutions and analyze bifurcating solutions. Curiously, the bifurcating branch is vertical, leading to a reversible, non-hysteretic phase transition. Near the bifurcation point, we demonstrate scaling laws for the size of vacuum regions, which can form fiss…

Intelligent Vacuum Thermoforming Process
Andi Kuswoyo, Christos Margadji, Sebastian W. Pattinson
https://arxiv.org/abs/2509.13250 https://arxiv.org/pdf/250…

Intelligent Vacuum Thermoforming Process
Ensuring consistent quality in vacuum thermoforming presents challenges due to variations in material properties and tooling configurations. This research introduces a vision-based quality control system to predict and optimise process parameters, thereby enhancing part quality with minimal data requirements. A comprehensive dataset was developed using visual data from vacuum-formed samples subjected to various process parameters, supplemented by image augmentation techniques to improve model t…

Battle Bots

Imprints of quantum vacuum fluctuations on the gravitational field of a spherical mass
Ra\'ul Carballo-Rubio, Francesco Di Filippo, Shinji Mukohyama, Kazumasa Okabayashi
https://arxiv.org/abs/2509.10667

Imprints of quantum vacuum fluctuations on the gravitational field of a spherical mass
The Schwarzschild geometry, describing the gravitational field of a spherical mass in classical vacuum, is one of the most famous vacuum solutions of the Einstein field equations. Classical vacuum is an idealization that does not include quantum vacuum fluctuations of quantum fields, and determining the form of the gravitational field of a spherical mass in quantum vacuum is an important step towards understanding the interplay between gravity and quantum field theory. We formulate and prove ge…

Instability of sphalerons in $\phi^4$ models with a false vacuum
Stephen C. Anco
https://arxiv.org/abs/2508.12150 https://arxiv.org/pdf/2508.12150

Instability of sphalerons in $ϕ^4$ models with a false vacuum
A one-parameter family of nonlinear (quartic) Klein-Gordon models having a sphaleron solution is studied. The sphaleron arises from a saddle point between true and false vacua in the energy functional. Its instability is shown be governed by a Heun differential equation after a change of variable. This allows an explicit formulation of the eigenfunctions and eigenvalues to be obtained in terms of local Heun functions. Good approximations are found for certain ranges of the parameter.

An elementary construction of the ring of dual $K$-$Q$-cancellation property
Shinsuke Iwao
https://arxiv.org/abs/2508.14484 https://arxiv.org/pdf/2508.1448…

An elementary construction of the ring of dual $K$-$Q$-cancellation property
This paper presents an elementary introduction on $K$-theoretic $Q$-functions, which were introduced by Ikeda and Naruse in 2013. These functions, which serve as $K$-theoretic analogs of Schur $Q$-functions, are known to possess combinatorial and algebraic constructions. In a 2022 paper, the author introduced ``$β$-deformed power-sums" to provide a simpler, more algebraic construction of these functions. Since the original approach relies on fermionic operators and vacuum expectation values, t…

Ex Situ Fabrication of Superconducting Nanostructures for Low-Temperature STM
Adrian Greichgauer, Roozbeh Yazdanpanah, Alexey Taskin, Oliver Breunig, Yoichi Ando, Jens Brede
https://arxiv.org/abs/2507.14092

Ex Situ Fabrication of Superconducting Nanostructures for Low-Temperature STM
Nanofabrication enables flexible experimental design but is often incompatible with scanning tunneling microscopy and spectroscopy (STM/STS) due to the latter's stringent surface quality requirements. Here, we present a fabrication strategy that combines ex situ nanolithography with in situ ultrahigh-vacuum (UHV) cleaving to produce atomically clean, nanopatterned superconductor/topological insulator (TI) heterostructures suitable for high-resolution STM/STS. In our initial Design I, nanoribbon…

Harvesting Contextuality from the Vacuum
Philip A. LeMaitre
https://arxiv.org/abs/2508.11773 https://arxiv.org/pdf/2508.11773

Harvesting Contextuality from the Vacuum
Quantum contextuality is the notion that certain measurement scenarios do not admit a global description of their statistics and has been implicated as the source of quantum advantage in a number of quantum information protocols. It has been shown that contextuality generalizes the concepts of non-local entanglement and magic, and is an equivalent notion of non-classicality to Wigner negativity. In this paper, the protocol of contextuality harvesting is introduced and it is shown that Unruh-DeW…

Accelerating Mirrors as a Physical Realization of the Kappa Plane-Wave Vacuum
Arash Azizi
https://arxiv.org/abs/2509.14239 https://arxiv.org/pdf/2509.14239…

Accelerating Mirrors as a Physical Realization of the Kappa Plane-Wave Vacuum
The kappa plane-wave vacuum is a family of kinematically defined quantum states whose thermal properties are well-understood, but whose physical origin has remained an open question. In this paper, we provide a concrete dynamical realization for this vacuum, demonstrating that it is physically and operationally equivalent to the quantum state produced by an accelerating Carlitz-Willey (CW) mirror on future null infinity. The equivalence is established through a three-pronged proof, showing that…

IDC: in Q1 2025, the world's top four robot vacuum makers, all from China, together accounted for 54.1% of shipments, as iRobot fell from first to fifth place (Wataru Suzuki/Nikkei Asia)
https://asia.nikkei.com/business/compa…

China's Roomba killers sweep up in vacuum market despite US tariffs
US robot pioneer on brink of default as Chinese brands expand rapidly

Notes on false vacuum decay in quantum Ising models
Ian G. Moss
https://arxiv.org/abs/2510.12592 https://arxiv.org/pdf/2510.12592

Notes on false vacuum decay in quantum Ising models
This paper aims to gather together some of the basic ideas behind the theory of false vacuum decay in quantum Ising models, focusing on the application of spin chains as analogue systems to false vacuum decay in elementary particle theory. Elementary results on quantum Ising models are rewritten to more closely resemble the original literature on false vacuum decay. A highly speculative conjecture for the false vacuum decay rate in a two dimensional quantum Ising model is also put forward.

Observational Analysis of Multi-thermal Counter-streaming Flows in a Forming Filament and Their Relationship with Local Heating at Filament Footpoints
Hongrui Li, Hechao Chen, Chun Xia, Xiaoli Yan, Yongyuan Xiang, Jincheng Wang
https://arxiv.org/abs/2508.12737

Observational Analysis of Multi-thermal Counter-streaming Flows in a Forming Filament and Their Relationship with Local Heating at Filament Footpoints
Utilizing high-resolution imaging and spectroscopic observations from the New Vacuum Solar Telescope (NVST), the Interface Region Imaging Spectrograph (IRIS), and the Solar Dynamics Observatory (SDO), we investigated the nature and origin of counter-streaming flows within a forming active region filament. The ever-present counter-streaming flows observed within the filament are identified as interleaved unidirectional mass flows in opposing directions occurring in neighboring threads. Multi-wav…

Compact stars in Einstein-scalar-Gauss-Bonnet gravity: regular and divergent scalar field configurations
Roberto D. Alba Q., Javier Chagoya, Armando A. Roque
https://arxiv.org/abs/2508.13273

Compact stars in Einstein-scalar-Gauss-Bonnet gravity: regular and divergent scalar field configurations
We investigate static, spherically symmetric solutions in Einstein-scalar-Gauss-Bonnet gravity non-minimally coupled to a massless real scalar field, both in vacuum and in the presence of fermionic matter. Focusing on a specific quadratic scalar-Gauss-Bonnet coupling, we identify two distinct classes of compact objects: one with a regular scalar field at the origin -- connected to general relativity in an appropriate limit -- and another {one} with a divergent scalar field at the origin but a r…

Searching for Lorentz invariance violation with artificial neural networks
Tomislav Terzi\'c, Karlo Mrakov\v{c}i\'c
https://arxiv.org/abs/2509.14818 https://

Searching for Lorentz invariance violation with artificial neural networks
Lorentz invariance violation (LIV) can have multiple consequences on very-high energy gamma rays' emission, propagation, and detection, such as energy-dependent photon group velocity, photon instability, vacuum birefringence, and modified electromagnetic interaction. Depending on the underlying theoretical model, several of these effects can coexist. Nevertheless, in experimental tests of LIV, each effect is tested separately and independently. Here, we are performing a search for traces of sev…

Modular Vacuum-Based Fixturing System for Adaptive Disassembly Workspace Integration
Haohui Pan, Takuya Kiyokawa, Tomoki Ishikura, Shingo Hamada, Genichiro Matsuda, Kensuke Harada
https://arxiv.org/abs/2508.05936

Modular Vacuum-Based Fixturing System for Adaptive Disassembly Workspace Integration
The disassembly of small household appliances poses significant challenges due to their complex and curved geometries, which render traditional rigid fixtures inadequate. In this paper, we propose a modular vacuum-based fixturing system that leverages commercially available balloon-type soft grippers to conform to arbitrarily shaped surfaces and provide stable support during screw-removal tasks. To enable a reliable deployment of the system, we develop a stability-aware planning framework that …

Si3N4 membrane as entrance window for plasma-generated vacuum ultraviolet (VUV) radiation
Luka Hansen, G\"orkem Bilgin, Jan Benedikt
https://arxiv.org/abs/2510.09524 https:…

Si3N4 membrane as entrance window for plasma-generated vacuum ultraviolet (VUV) radiation
Vacuum ultraviolet (VUV) radiation produced by an atmospheric pressure plasma was successfully measured down to wavelengths of 58.4nm utilizing a 20nm thin Si3N4 membrane to transfer the VUV radiation into a vacuum monochromator. This method allows measurements without disturbing the plasma or the spectra. He2 absorption could be observed by filling the monochromator with He. Transmission of the Si3N4 membrane in the region of the He2 excimer continua (58nm to 100 nm) could indirectly be measur…

Real time observation of glass-like carbon formation from SU-8 using X-ray and ultraviolet photoelectron spectroscopy
Simon Astley, Jaspa Stritt, Soumen Mandal, Jerome A. Cuenca, D. Andrew Evans, Oliver A. Williams
https://arxiv.org/abs/2507.14053

Real time observation of glass-like carbon formation from SU-8 using X-ray and ultraviolet photoelectron spectroscopy
The structural development and change in elemental composition of SU-8 3005 photoresist into glass-like carbon due to pyrolysis up to 1000~$\degree$C is investigated utilising \textit{in-situ} x-ray and ultraviolet photoelectron spectroscopy (XPS/UPS) under ultra-high vacuum (UHV). XPS spectra were analysed in order to investigate changes to elemental composition and physical structure. Peak asymmetry in the measured C 1s spectra is found to be a clear indicator of a transition in both physical…

Spontaneous emission in dipole approximation -- revisited
Paul R. Berman, Peter W. Milonni
https://arxiv.org/abs/2507.14075 https://a…

Spontaneous emission in dipole approximation -- revisited
Spontaneous emission in dipole approximation is studied theoretically using both source-field theory and a Schrodinger picture approach. Using source-field theory we obtain formal equations for the Poynting vector and energy density without making the rotating wave approximation (RWA) and Weisskopf-Wigner approximation (WWA). The initial condition at t=0 is one in which the atom is in an excited state and the field in the vacuum state. The source-field expressions are evaluated within the the R…

Crosslisted article(s) found for hep-lat. https://arxiv.org/list/hep-lat/new
[1/1]:
- Real-time bubble nucleation and growth for false vacuum decay on the lattice
Daan Maertens, Jutho Haegeman, Karel Van Acoleyen

With a Democratic Party leadership vacuum, Obama steps up his criticism of Trump (NBC News)
https://www.nbcnews.com/politics/trump-administration/democratic-leadership-vacuum-obama-trump-criticism-rcna233711
http://www.memeorandum.com/251004/p50#a251004p50

Performance Enhancement of Medium-Temperature Baked Niobium SRF Cavity by Surface Contamination Removal
V. Chouhan (Fermi National Accelerator Laboratory, Batavia, Illinois, USA), D. Bice (Fermi National Accelerator Laboratory, Batavia, Illinois, USA), A. Cravatta (Fermi National Accelerator Laboratory, Batavia, Illinois, USA), A. Murthy (Fermi National Accelerator Laboratory, Batavia, Illinois, USA), A. Netepenko (Fermi National Accelerator Laboratory, Batavia, Illinois, USA), T. Ring…

Performance Enhancement of Medium-Temperature Baked Niobium SRF Cavity by Surface Contamination Removal
Medium temperature (mid-T) baking, typically conducted at 300 350 C, enhances the quality factor of niobium (Nb) superconducting radio frequency cavities. High vacuum furnace baking is commonly preferred for its practicality in large-scale processing. However, surface contamination, such as niobium carbide formed during vacuum furnace baking, can limit the quench field and degrade the quality factor of the cavity. To investigate this effect, a 1.3 GHz single-cell Nb cavity underwent mid-T bakin…

Localized In-Plane Cavity Optomechanics in MEMS
Sasan Rahmanian
https://arxiv.org/abs/2509.15203 https://arxiv.org/pdf/2509.15203

Localized In-Plane Cavity Optomechanics in MEMS
This study demonstrates the realization of localized in-plane optomechanical microcavities embedded within an electrostatic MEMS architecture. The system consists of a curved, clamped-clamped microbeam, fabricated on a silicon-on-insulator (SOI) wafer. A green laser emitted from a Laser Doppler Vibrometer (LDV), is directed perpendicularly onto the device under a vacuum pressure of 7 mTorr, with the beam aligned to fill the gap between the movable microbeam and its adjacent side fixed mirror. T…

Global Strong Solutions to the Three-Dimensional Axisymmetric Compressible Navier-Stokes Equations with Large Initial Data and Vacuum
Qinghao Lei
https://arxiv.org/abs/2509.11260

Global Strong Solutions to the Three-Dimensional Axisymmetric Compressible Navier-Stokes Equations with Large Initial Data and Vacuum
This paper investigates the three-dimensional axisymmetric compressible Navier-Stokes equations with slip boundary conditions in a cylindrical domain that excludes the axis. For initial density allowed to vanish, the global existence and large time asymptotic behavior of strong and weak solutions are established, provided the shear viscosity is a positive constant and the bulk one is a power function of density with the power bigger than four-thirds. It should be noted that this result is obtai…

So we've been using a Neato vacuum robot for years. It works and with cats having the main living areas vacuumed every day was great. Now the company who bought them no longer wants to run the backend cloud service that allows the robot to actually run on a schedule which is the point of the whole operation.
Vorwerk just created a whole lot of e-waste for shits and giggles.

Exact solutions of Maxwell vacuum equations in Petrov homogeneous non-null spaces
V. V. Obukhov
https://arxiv.org/abs/2509.13087 https://arxiv.org/pdf/2509…

Exact solutions of Maxwell vacuum equations in Petrov homogeneous non-null spaces
The classification of exact solutions of Maxwell vacuum equations for pseudo-Riemannian spaces with spatial symmetry (homogeneous non-null spaces of Petrov) in the presence of electromagnetic fields invariant with respect to the action of the group of space motions is summarized. A new classification method is used, common to all homogeneous zero spaces of Petrov. The method is based on the use of canonical reper vectors and a on the use a new approach to the systematization of solutions. The c…

Real-time vacuum-state quantum random number generator on a chip
Guan-Ru Qiao, Bing Bai, Zi-Xuan Weng, Han-Shen Chen, Wei Zheng, Zhi-Yuan Zheng, You-Qi Nie, Jun Zhang, Jian-Wei Pan
https://arxiv.org/abs/2509.13105

Real-time vacuum-state quantum random number generator on a chip
Quantum random number generators (QRNGs) produce true random numbers, which are guaranteed by the fundamental principles of quantum physics. Miniaturization of QRNGs is crucial for a wide range of communication and cryptography applications. Here, we first report a fully functional QRNG chip based on vacuum-state fluctuations, with dimensions of 16.6 mm x 7.8 mm. The quantum entropy source, which is achieved via hybrid photonic integration with a SiO2 waveguide, generates raw quantum random num…

An efficient spectral Poisson solver for the nirvana-III code: the shearing-box case with vertical vacuum boundary conditions
S. Rendon Restrepo, O. Gressel
https://arxiv.org/abs/2510.10070

An efficient spectral Poisson solver for the nirvana-III code: the shearing-box case with vertical vacuum boundary conditions
The stability of a differentially rotating fluid subject to its own gravity is a problem with applications across wide areas of astrophysics--from protoplanetary discs (PPDs) to entire galaxies. The shearing box formalism offers a conceptually simple framework for studying differential rotation in the local approximation. Aimed at self-gravitating, and importantly, vertically stratified PPDs, we develop two novel methods for solving Poisson's equation in the framework of the shearing box with v…

For sites that complain about me running ad blockers. How do you know I am running them? Could it be you are running intrusive scripts trying to vacuum out as much information about me so you can sell it?
I run ads blockers just for that reason. I have no problems with ads. Some sites also respect me, and I have minimal to no blocking enabled for them.
No to your cookies.
No to your knowing my location.
No to your wanting access to my contacts.
You can block me…

Some geometric properties of generalized $\varphi$-vacuum static spaces
Letizia Branca, Paolo Mastrolia, Marco Rigoli
https://arxiv.org/abs/2509.05125 https://

Some geometric properties of generalized $φ$-vacuum static spaces
In this paper we study the geometry of generalized $φ$-vacuum static spaces, proving estimates for the $φ$-scalar curvature and for the first eigenvalue of the Jacobi operator, and also rigidity under various geometric assumptions; in particular, we prove a result related to the famous Cosmic no-hair conjecture of Boucher, Gibbons and Horowitz.

Stringy Constraints on Modular Flavor Models
Keiya Ishiguro, Takafumi Kai, Tatsuo Kobayashi, Hajime Otsuka
https://arxiv.org/abs/2508.12392 https://arxiv.o…

Stringy Constraints on Modular Flavor Models
We investigate stringy constraints on moduli spaces in modular flavor models by analyzing moduli-dependent threshold corrections in heterotic string vacua. While moduli play a crucial role in determining the flavor structure of fermions predicted by modular flavor models, the parameter space in which their vacuum expectation values are allowed has not been fully explored. In this work, within the framework of perturbative heterotic string theory on toroidal orbifolds, we derive constraints on t…

Using molecular dynamics to investigate the driving force for graphene auto-kirigami
Charlie M. Rawlins, Gareth A. Tribello
https://arxiv.org/abs/2509.13999 https://

Using molecular dynamics to investigate the driving force for graphene auto-kirigami
Experiments [1] have shown that auto-kirigami structures can grow on the surface of graphene because the graphene-graphene adhesion energy is greater than the graphene-substrate interaction. In this work molecular dynamics (MD) simulations of folded graphene both in vacuum and on a substrate have been performed for a range of different initial geometries and at various temperatures. The final equilibrated configuration for many of these simulations resembles a book with a fold that is at the mi…

Crystal Orientation Dependence of Extreme Near-Field Heat Transfer between Polar Materials Governed by Surface Phonon Modes
Wei-Zhe Yuan, Yangyu Guo, Hong-Liang Yi
https://arxiv.org/abs/2509.13837

Crystal Orientation Dependence of Extreme Near-Field Heat Transfer between Polar Materials Governed by Surface Phonon Modes
Due to the rapid development of micro- and nano-manufacturing and electronic devices, heat transfer at the transition regime between radiation and conduction becomes increasingly important. Recent work has demonstrated the importance of nonlocal optical response and phonon tunneling. However, it remains unclear how the crystal orientation impacts them. In this work, we study this effect on heat transport across vacuum gaps between magnesium oxide (MgO) by nonequilibrium molecular dynamics (NEMD…

Measurement of radiant spectrum for excess heat generation in NiCu and Ni thin film during hydrogen gas desorption
J. Kasagi, T. Itoh, Y. Shibasaki, Y. Iwamura
https://arxiv.org/abs/2509.13847

Measurement of radiant spectrum for excess heat generation in NiCu and Ni thin film during hydrogen gas desorption
Heat production in Ni-based thin films interacting with hydrogen gas was studied using a radiation calorimeter equipped with a composite photon-detector system. Measurements were performed on pure Ni foil and NiCu composite thin films. Electromagnetic radiation emitted from samples heated to approximately 1100 K in vacuum was recorded over the energy range of 0.05 - 2.5 eV. In this study,detailed spectra were obtained, particularly in the low-energy region below 0.5 eV. The peak of the thermal …

A no-go theorem for large $N$ closed universes
Elliott Gesteau
https://arxiv.org/abs/2509.14338 https://arxiv.org/pdf/2509.14338

A no-go theorem for large $N$ closed universes
Under conservative assumptions, it is established at a mathematical level of rigor that if correlation functions of single trace operators in a sequence of states of $O(N^0)$ energy of a two-sided holographic conformal field theory admit a large $N$ limit, then they must be described a pure state in the large $N$ Hilbert space of free field theory on two copies of vacuum AdS. This result clarifies recent discussions concerning the possible emergence of a semiclassical baby universe in the large…

Generation of High Order Harmonics in Vacuum for Various Configurations of Interacting Electromagnetic Field
Pavel Sasorov, Sergei Bulanov
https://arxiv.org/abs/2508.09214 https…

Generation of High Order Harmonics in Vacuum for Various Configurations of Interacting Electromagnetic Field
High order harmonic (HOH) generation by interacting extremely intense electromagnetic waves in the quantum vacuum is investigated within the framework of the Heisenberg-Euler formalism. We consider here the process in the lowest order of a perturbation theory relative to the electromagnetic (EM) beam intensity, giving contribution to the HOH generation. The main expressions are obtained for a general geometry, whyle polarizations of different sub-beams forming the EM beam focus are almost the s…

From de Sitter to Anti-de Sitter singularity regularization: theory and phenomenology
Julio Arrechea, Stefano Liberati, Hooman Neshat, Vania Vellucci
https://arxiv.org/abs/2509.13421

From de Sitter to Anti-de Sitter singularity regularization: theory and phenomenology
Recent investigations of vacuum polarization in extremely compact stars suggest that, in such regimes, the effective matter content of spacetime may acquire a vacuum-energy equation of state with negative energy density, mimicking a negative cosmological constant. Motivated by this observation, we introduce a general algorithm to modify well-known spherically symmetric regular black hole metrics by replacing their usual de Sitter cores (dSC) with Anti-de Sitter cores (AdSC). Like their dSC coun…

QCD Sum Rule Study of the Tensor $\Delta^0\Delta^0$ Dibaryon State
M. Ahmadi, H. Mohseni, K. Azizi
https://arxiv.org/abs/2508.12105 https://arxiv.org/pdf/2…

QCD Sum Rule Study of the Tensor $Δ^0Δ^0$ Dibaryon State
We study the exotic $Δ^{0}Δ^{0}$ dibaryon state with quantum numbers $J^{P} = 2^{+}$ within the framework of QCD sum rules. A tensor interpolating current is constructed to determine the mass and residue of this state, including explicit calculations of contributions from quark, gluon, and mixed vacuum condensates up to dimension nine. The numerical analysis yields a mass of $m_{Δ^{0}Δ^{0}} = 2426^{+101}_{-108}~\mathrm{MeV}$ and a residue of $f_{Δ^{0}Δ^{0}} = \left( 2.30^{+0.49}_{-0.45} \…

An inequality for relativistic local quantum measurements
Riccardo Falcone, Claudio Conti
https://arxiv.org/abs/2509.11599 https://arxiv.org/pdf/2509.11599…

An inequality for relativistic local quantum measurements
We investigate the trade-off between vacuum insensitivity and sensitivity to excitations in finite-size detectors, taking measurement locality as a fundamental constraint. We derive an upper bound on the detectability of vacuum excitation, given a small but nonzero probability of false positives in the vacuum state. The result is independent of the specific details of the measurement or the underlying physical mechanisms of the detector and relies only on the assumption of locality. Experimenta…

Vacuum electromagnetic field correlations between two moving points
Michael Vaz, Herv\'e Bercegol
https://arxiv.org/abs/2509.09557 https://arxiv.org/pd…

Vacuum electromagnetic field correlations between two moving points
A renewed experimental interest in quantum vacuum fluctuations brings back the need to extend the study of electromagnetic vacuum correlations. Quantum or semi-classical models developed to understand various configurations should combine the effects of the zero-point fluctuations with those of blackbody radiation. In this paper, after a brief historical introduction and a rapid study of the electric field correlations in time domain, we propose exact and approximate expressions for the vacuum …

Detection of the laser induced damage using a He Ne laser reflective imaging technique
Franti\v{s}ek Nov\'ak, Liliia Uvarova, \v{S}\'arka N\v{e}mcov\'a, Mihai-George Mure\c{s}an
https://arxiv.org/abs/2509.10217

Detection of the laser induced damage using a He Ne laser reflective imaging technique
Laser-induced damage is a serious challenge for optical components; therefore, determining the laser-induced damage threshold (LIDT) is a crucial step in the manufacturing process. In many cases, such as for space applications, it is also necessary to account for the vacuum environment. Since conventional damage detection methods face limitations under vacuum conditions, an alternative approach is required. This article introduces a He-Ne laser imaging system designed for in-situ damage detecti…

Analysis of the semileptonic decays $\Lambda_b\to\Lambda_cl\bar{\nu}_l$ and $\Xi_b\to\Xi_cl\bar{\nu}_l$ in QCD sum rules
Jie Lu, Guo-Liang Yu, Dian-Yong Chen, Zhi-Gang Wang, Bin Wu
https://arxiv.org/abs/2508.11900

Analysis of the semileptonic decays $Λ_b\toΛ_cl\barν_l$ and $Ξ_b\toΞ_cl\barν_l$ in QCD sum rules
In this article, the electroweak transition form factors of $Λ_b\toΛ_c$ and $Ξ_b\toΞ_c$ are analyzed within the framework of three-point QCD sum rules. In phenomenological side, all possible couplings of interpolating current to hadronic states are considered. In QCD side, the perturbative part and the contributions of vacuum condensates up to dimension 8 are also considered. With the calculated form factors, we study the decay widths and branching ratios of semileptonic decays $Λ_b\toΛ_c…

Dynamical measurement of saturation vapor pressures below and above room temperature
Mohsen Salimi, Andreas B. Pedersen, John E. V. Andersen, Henrik B. Pedersen, Aur\'elien Dantan
https://arxiv.org/abs/2508.10932

Dynamical measurement of saturation vapor pressures below and above room temperature
We report on the implementation of a dynamical method for the determination -- in an extended temperature range around room temperature -- of the saturation vapor pressure and enthalpy of vaporization of low-volatility liquid substances. The method relies on isolating a \textit{precooled} substance in a heated chamber under static vacuum conditions and monitoring the chamber pressure as the sample slowly thermalizes to the chamber temperature. We apply the method to four reference substances --…

Global Existence and Incompressible Limit for the Three-Dimensional Axisymmetric Compressible Navier-Stokes Equations with Large Bulk Viscosity and Large Initial Data
Qinghao Lei
https://arxiv.org/abs/2509.12614

Global Existence and Incompressible Limit for the Three-Dimensional Axisymmetric Compressible Navier-Stokes Equations with Large Bulk Viscosity and Large Initial Data
In this paper, we study the three-dimensional axisymmetric compressible Navier-Stokes equations with slip boundary conditions in a cylindrical domain excluding the axis. We establish the global existence and exponential decay of weak, strong, and classical solutions with large initial data and vacuum, under the assumption that the bulk viscosity coefficient is sufficiently large. Moreover, we demonstrate that as the bulk viscosity coefficient tends to infinity, the solutions of the compressible…

Can Hawking effect of multipartite state protect quantum resources in Schwarzschild black hole?
Shu-Min Wu, Xiao-Wei Teng, Hui-Chen Yang, Rui-Yang Xu, P. H. M. Barros, H. A. S. Costa
https://arxiv.org/abs/2509.15002

Can Hawking effect of multipartite state protect quantum resources in Schwarzschild black hole?
Most previous studies on relativistic quantum information have primarily focused on the vacuum state $|0\rangle$ and the first excited state $|1\rangle$ in two-mode entangled systems. In this work, we go beyond these limitations by considering arbitrary $q$-th excited states $|q\rangle$, aiming to investigate their role in preserving quantum resources. We analyze the influence of the Hawking effect on multipartite quantum states in the Schwarzschild spacetime, with particular att…

An effective density matrix for vacua in asymptotically flat gravity
Temple He, Prahar Mitra, Kathryn M. Zurek
https://arxiv.org/abs/2509.13401 https://arx…

An effective density matrix for vacua in asymptotically flat gravity
We explicitly construct the density matrix associated to the vacuum state of a large spherically symmetric causal diamond of area $A$ in four-dimensional asymptotically flat gravity. We achieve this using the soft effective action, which characterizes the low-energy gravitational degrees of freedom that arise in the long-distance limit of the Einstein-Hilbert action and consists of both the soft graviton mode and the Goldstone mode arising from the spontaneous breaking of supertranslation symme…

A Fully Discrete Element Approach for Modeling Vacuum Packed Particle Dampers
Pawel Chodkiewicz, Robert Zalewski, Jakub Lengiewicz
https://arxiv.org/abs/2509.04697 https://

A Fully Discrete Element Approach for Modeling Vacuum Packed Particle Dampers
In this work, we investigate Vacuum-Packed Particle (VPP) dampers -- granular-core dampers offering tunable damping performance -- as a more sustainable alternative to conventional systems such as magnetorheological fluid dampers. A comprehensive computational model of the entire VPP damper system is developed using the Discrete Element Method (DEM). A novel discrete-element model of the flexible foil, responsible for consistently transmitting the external pressure resulting from vacuum applica…

Resolution of spin crisis, and notes on the Bjorken sum rule, anomaly and constituent quark
J. Pasupathy, Janardhan P. Singh
https://arxiv.org/abs/2508.12156 https://

Resolution of spin crisis, and notes on the Bjorken sum rule, anomaly and constituent quark
It is shown that the widely used parton model expression for $ g_1$ in polarized proton-lepton scattering is incorrect as it ignores gluon-quark spin entanglement. Therefore, there is no spin crisis. A brief summary of results of the theoretical evaluation of non-octet axial vector current renormalization constants and anomaly -anomaly vacuum correlator is given. It suggests that anomaly plays an important role in the transformation of current quarks to constituent quarks and chiral symmetry br…

Quantum Dial for High-Harmonic Generation
Lu Wang, Andrew M. Parks, Adam Thorpe, Graeme Bart, Thomas Brabec
https://arxiv.org/abs/2509.13518 https://arxiv.…

Quantum Dial for High-Harmonic Generation
High-harmonic generation (HHG) is a highly nonlinear optical process that typically requires an intense laser to trigger emissions at integer multiples of the driving field frequency. Since HHG is commonly used as a spectroscopic tool to probe material properties, it becomes impossible to extract information about a material without introducing distortions caused by the strong driving field. Recent advances in bright squeezed vacuum sources have allowed HHG to be driven by purely quantum fields…

Impact of space-time curvature coupling on the vacuum energy induced by a magnetic topological defect in flat space-time of arbitrary dimension
V. M. Gorkavenko, O. V. Barabash, I. V. Ivanchenko, P. O. Nakaznyi, M. S. Tsarenkova, N. S. Yakovenko, A. O. Zaporozhchenko
https://arxiv.org/abs/2509.06815

Impact of space-time curvature coupling on the vacuum energy induced by a magnetic topological defect in flat space-time of arbitrary dimension
We have investigated vacuum polarization of a quantized charged massive scalar field in the presence of a magnetic topological defect, modeled as an impenetrable tube of finite thickness carrying magnetic flux. At the tube's surface, we imposed a generalized Robin boundary condition. Our analysis demonstrates that, in flat space-time, the total induced vacuum energy is independent of the coupling $ξ$ of the scalar field's interaction with the space-time curvature only in the special cases of D…

Non-invertible Symmetry as a Solution to the Strong CP Problem in a GUT-inspired Standard Model
Tatsuo Kobayashi, Hajime Otsuka, Tsutomu T. Yanagida
https://arxiv.org/abs/2508.12287

Non-invertible Symmetry as a Solution to the Strong CP Problem in a GUT-inspired Standard Model
We propose a three-zero texture for the down-quark mass matrix within a $SU(5)$ GUT-inspired Standard Model, enforced by a non-invertible selection rule originating from $\mathbb{Z}_2$ gauging of $\mathbb{Z}_N$ symmetries. Assuming CP invariance at the high-energy scale, our framework solves the strong CP problem while reproducing a realistic quark mass matrix. The CP symmetry is spontaneously broken down at an intermediate scale via complex vacuum expectation values of new scalar fields $η_i$…

James Burkett Hartle: a Biographical Memoir
Gary T. Horowitz, Kip S. Thorne
https://arxiv.org/abs/2509.14288 https://arxiv.org/pdf/2509.14288

James Burkett Hartle: a Biographical Memoir
James Burkett Hartle was a theoretical physicist who made major contributions to our understanding of relativistic stars, black holes, and cosmology. Most of his career, however, was devoted to studying the universe as a quantum system. As a result, he was known as the father of quantum cosmology. He is best known for two seminal papers with Stephen Hawking that introduced two quantum states of fundamental importance: the "Hartle-Hawking vacuum" for matter fields outside a black hole, and the "…

Study of a coaxial vacuum arc thruster plume and its interaction with applied magnetic field
M Jimenez Diaz (LAPLACE-GREPHE), L Garrigues (LAPLACE-GREPHE), G J M Hagelaar (LAPLACE-GREPHE), F Gaboriau (LAPLACE-GREPHE), L Liard (LAPLACE, LAPLACE-GREPHE), L Herrero, A Blanchet
https://arxiv.org/abs/2509.06432

Study of a coaxial vacuum arc thruster plume and its interaction with applied magnetic field
A hybrid model where ions are treated as particles and electrons with fluid equations for magnetized electron flux is adapted in order to simulate a vacuum arc source. This source is a candidate for solid propellant propulsion system of micro- and nano-satellites. We show preliminary results of the plume and interelectrode region properties with and without the influence of an imposed magnetic field. We compare the results with experimental data, and we find that the magnetic collimation is ove…

Control of nonlinear Compton scattering in a squeezed vacuum
A. Di Piazza, K. Qu
https://arxiv.org/abs/2508.09301 https://arxiv.org/pdf/2508.09301

Control of nonlinear Compton scattering in a squeezed vacuum
Electromagnetic radiation by accelerated charges is a fundamental process in physics. Here, we introduce a quantum-optical framework for controlling the emission of radiation of an electron in an intense laser field via squeezed vacuum states. By engineering the quantum fluctuations of the emission modes, we demonstrate that the probability of nonlinear Compton scattering can be significantly enhanced or suppressed through tunable squeezing amplitude and angle. Our predictions are experimentall…

Vacuum polarization in the horizonless Bardeen metric
Andr\'es Boasso, Francisco D. Mazzitelli
https://arxiv.org/abs/2508.06465 https://arxiv.org/pdf/2…

Vacuum polarization in the horizonless Bardeen metric
We compute the renormalized stress-energy tensor for a massless quantum scalar field in the background of the horizonless Bardeen spacetime. Within the weak-field approximation, we show that the vacuum fluctuations differ significantly between conformally and non-conformally coupled fields, both in magnitude and in their behavior at short and intermediate distances. At large distances, we recover the universal asymptotic behavior previously observed in black hole and Newtonian star backgrounds.…

Coherent Two-State Oscillations in False Vacuum Decay Regimes
Peiyun Ge, Xiao Wang, Yu-Xin Chao, Rong Lv, Li You
https://arxiv.org/abs/2509.04272 https://a…

Coherent Two-State Oscillations in False Vacuum Decay Regimes
Coherent two-state oscillations are observed in numerical simulations of one-dimensional transverse- and longitudinal-field Ising model within the false vacuum decay regimes. Starting from the false vacuum state with all spins up, in moderate-sized systems with a small transverse field, we find conventional decay dynamics at resonance conditions $ h\approx 2J/n$ can change into coherent oscillations between the false vacuum and a symmetric resonant state, manifested by a sub-leading eigenstate …

Comparison of wave-mixing processes in rarefied gas and QED vacuum using numerical simulations
Marianna Lytova, Fran\c{c}ois Fillion-Gourdeau, Simon Valli\`eres, Sylvain Fourmaux, Fran\c{c}ois L\'egar\'e, Steve MacLean
https://arxiv.org/abs/2509.22894

Comparison of wave-mixing processes in rarefied gas and QED vacuum using numerical simulations
We study the conditions required to distinguish laser-induced nonlinear quantum electrodynamics (QED) effects in vacuum from competing signals due to interactions of laser pulses with ionized residual gas. The latter is inevitably present in vacuum chambers where experiments are performed because the vacuum is never perfect and there is always some residual pressure. The rarefied gas contribution is modeled statistically using the 1D-1V Vlasov-Maxwell system, while vacuum nonlinearities are des…

Long-Time Dynamics of the 3D Vlasov-Maxwell System with Boundaries
Jin Woo Jang, Chanwoo Kim
https://arxiv.org/abs/2509.11064 https://arxiv.org/pdf/2509.11…

Long-Time Dynamics of the 3D Vlasov-Maxwell System with Boundaries
We construct global-in-time classical solutions to the nonlinear Vlasov-Maxwell system in a three-dimensional half-space beyond the vacuum scattering regime. Our approach combines the construction of stationary solutions to the associated boundary-value problem with a proof of their asymptotic dynamical stability in $L^\infty$ under small perturbations, providing a new framework for understanding long-time wave-particle interactions in the presence of boundaries and interacting magnetic fields.…

Localized degenerate solutions to the massless Dirac and Weyl equations
Georgios N. Tsigaridas, Aristides I. Kechriniotis, Christos A. Tsonos, Konstantinos K. Delibasis
https://arxiv.org/abs/2509.14212

Localized degenerate solutions to the massless Dirac and Weyl equations
In this article we present a general class of degenerate solutions to the massless Dirac and Weyl equations, which can describe localized particles and/or particles with variable energy, that could be interpreted as virtual particles appearing either in the vacuum or in materials supporting massless Dirac or Weyl particles. These solutions exist in a wide range of electromagnetic 4-potentials and fields, which are explicitly calculated. In addition, we describe a method for controlling the tran…

Vacuum Dealloyed Brass as Li-Metal Battery Current Collector: Effect of Zinc and Porosity
Eric V Woods, Xinren Chen, Shaolou Wei, Alisson Kwiatkowski da Silva, Ayman A El-Zoka, J Manoj Prabhakar, Tim M Schwarz, Yongqiang Kang, Leonardo S Aota, Mahander P Singh, Katja Angenendt, Ozge Ozgun, Matic Jovivcevic-Klug, Patricia Jovivcevic-Klug, Christian Bross, Jian Liu, Rene de Kloe, Gerhard Dehm, Stefan Zaefferer, Yug Joshi, Baptiste Gault

Vacuum Dealloyed Brass as Li-Metal Battery Current Collector: Effect of Zinc and Porosity
"Anode-free" lithium-metal batteries promise significantly higher energy density than conventional graphite-based lithium-ion batteries; however, lithium dendrite growth can lead to internal short circuits with associated safety risks. While porous current collectors can suppress dendrite growth, optimal porosity and composition remain unknown. Here, we show that the temperature during vapor phase dealloying (VPD) of alpha-brass (Cu63Zn37) controls the surface Zn concentration, decreasing from …

The possibility to experimentally determine the structure of a fermionic vacuum in quantum electrodynamics
V. P. Neznamov
https://arxiv.org/abs/2509.04525 https://

The possibility to experimentally determine the structure of a fermionic vacuum in quantum electrodynamics
In the standard quantum electrodynamics (QED), the fermionic vacuum is a continuum of randomly created and annihilated virtual electron-positron pairs. In this case, in the strong electromagnetic fields, vacuum creation of real electron-positron pairs is possible. In particular, in the standard QED in a strong uniform electrical field, the Schwinger effect is implemented. Currently, there exist the QED versions with empty fermionic vacuum without fluctuations of creation and annihilation of vir…

Replaced article(s) found for physics.plasm-ph. https://arxiv.org/list/physics.plasm-ph/new
[1/1]:
- Including the vacuum energy in stellarator coil design
S. Guinchard, S. R. Hudson, E. J. Paul

Loss-tolerant detection of squeezed states in the 2 um region
K. M. Kwan, T. G. McRae, J. Qin, D. W. Gould, S. S. Y. Chua, J. Junker, R. Iden, V. B. Adya, M. J. Yap, B. J. J. Slagmolen, D. E. McClelland, R. L. Ward
https://arxiv.org/abs/2509.13810

Loss-tolerant detection of squeezed states in the 2 um region
Squeezed states of light enable quantum-enhanced measurements but are limited by optical loss, particularly at 2 um where photodiode efficiency is low. We report the first loss-tolerant, audio-band squeezed light detection at 1984 nm by using a phase-sensitive amplifier to amplify the squeezed vacuum prior to detection. This technique increases the effective detection efficiency from 74% to 95% and increases the observed squeezing from 4 dB to 8 dB, the highest level of squeezing observed at th…

THE KERR-SEN Solution Satisfying SO(2) Symmetry
Winston Chen, Yao-Guang Zheng
https://arxiv.org/abs/2509.13343 https://arxiv.org/pdf/2509.13343

THE KERR-SEN Solution Satisfying SO(2) Symmetry
We present a new class of KERR-SEN solutions that respect SO(2) symmetry, constructed systematically using the Laurent series expansion method. This approach is based on stationary, axisymmetric Euclidean solutions to the vacuum Einstein equations and incorporates advanced techniques for generating stationary gravitational fields, including the variation-of-constants method and nonlinear superposition. Through this unified framework, we obtain fresh insights into axially symmetric gravitational…

Primordial Tangyuan Quark Stars Made of Longevous False Vacuum
Jingdong Shao, Mei Huang
https://arxiv.org/abs/2510.06065 https://arxiv.org/pdf/2510.06065…

Primordial Tangyuan Quark Stars Made of Longevous False Vacuum
High quark chemical potential can induce a potential barrier and suppress the nucleation in a dynamical first-order chiral phase transition. Quark matter in the early Universe can therefore remain as metastable false vacuum and constitute primordial compact objects. We have investigated the properties and possible destinies of two distinct branches of primordial compact objects, quark stars with a true vacuum core and a false vacuum crust named tangyuan stars, and quark nuggets with a global fa…

Hybrid Optomechanical Cooling with Kerr Magnons and Squeezed Vacuum
Xiao-Hong Fan, Qin-Geng Chen, Jiaojiao Chen, Wei Xiong
https://arxiv.org/abs/2508.09725 https://

Hybrid Optomechanical Cooling with Kerr Magnons and Squeezed Vacuum
Ground-state cooling is essential for accessing the quantum regime and enabling quantum control of macroscopic systems. However, achieving optomechanical cooling in the unresolved-sideband regime ($ω_b < κ$) remains challenging. In this Letter, we propose an efficient cooling strategy based on a hybrid optomechanical system incorporating a yttrium iron garnet (YIG) sphere embedded in an optomechanical cavity. Under strong cavity driving, the Kerr nonlinearity of the magnons hosted in the YIG …

Replaced article(s) found for gr-qc. https://arxiv.org/list/gr-qc/new
[1/1]:
- Shadows of generalised Hayward spacetimes : in vacuum and with plasma
Suvikranth Gera, Saurabh Kumar, Poulami Dutta Roy, Sayan Chakrabarti

Electromagnetic instability of vacuum with instantons in the holographic plasma
Shao-cheng Hou, Si-wen Li
https://arxiv.org/abs/2510.04348 https://arxiv.or…

Electromagnetic instability of vacuum with instantons in the holographic plasma
Using the gauge-gravity duality, we study the electromagnetic instability of vacuum with instantons in holographic plasma. The model we employ is the D(-1)-D3 brane system in which the D(-1)-branes correspond to the instantons in holography. To take into account the flavored quarks, the coincident probe D7-branes as flavors are embedded into the bulk geometry so that the effective electromagnetic Lagrangian with flavors corresponds to the action of the D7-branes according to gauge-gravity duali…

Vacuum Structure of an Extended Standard Model with $U(1)_D$ Symmetry
Apriadi Salim Adam, Yunita Kristanti Andriani, Bayu Dirgantara
https://arxiv.org/abs/2509.05534 https://

Vacuum Structure of an Extended Standard Model with $U(1)_D$ Symmetry
In this research, we investigate the vacuum structure of an extended standard model with a $U(1)_D$ global symmetry. The scalar sector consists of three $SU(2)$ doublets as well as one complex singlet and one real singlet, resulting in a more complicated vacuum structure compared to that of the Standard Model. We analyze various theoretical constraints, including the conditions for being bounded from below, the existence of a global minimum, and perturbativity up to the Planck scale. Additional…

Einstein's Equations in Electromagnetic Media
Eren Erberk Erkul, Ulf Leonhardt
https://arxiv.org/abs/2508.11300 https://arxiv.org/pdf/2508.11300…

Einstein's Equations in Electromagnetic Media
In this paper, Plebanski's 1960 mapping is extended to encode the full Einstein system in an electromagnetic medium. This is achieved by identifying transformation parameters in terms of the ADM constraint and evolution equations, and subsequently applying the mapping to the entire system. These transformed equations are then linearized in vacuum to derive gravitational-wave analogues as perturbations within the optical medium.

QCD Effective Lagrangian and Condensation of Chromomagnetic Flux Tubes
George Savvidy
https://arxiv.org/abs/2509.11375 https://arxiv.org/pdf/2509.11375

QCD Effective Lagrangian and Condensation of Chromomagnetic Flux Tubes
Vacuum polarisation effects induced by the sourceless solutions of the Yang-Mills equation are investigated. These solutions represent oppositely oriented chromomagnetic flux tubes permeating the space in all directions. We review and prove the gauge invariance of the effective Lagrangian on sourceless gauge fields and present a number of alternative methods allowing to compute the effective Lagrangian. We compute the effective Lagrangian on chromomagnetic flux tube solutions and demonstrate th…

Shedding light on dark matter spikes through neutrino-dark matter interactions
Federica Pompa, Manibrata Sen
https://arxiv.org/abs/2508.10983 https://arxiv…

Shedding light on dark matter spikes through neutrino-dark matter interactions
The origin of neutrino mass remains an open question in particle physics. One intriguing possibility is that neutrinos are massless in vacuum but acquire an effective refractive mass through interactions with ultralight dark matter (DM) during propagation. We investigate the capability of the upcoming Deep Underground Neutrino Experiment (DUNE) to probe such refractive masses using the time-of-flight delays of neutrinos from a galactic core-collapse supernova. Our analysis shows that DUNE can s…

When vacuum breaks: a self-consistency test for astrophysical environments in extreme mass ratio inspirals
Lorenzo Copparoni, Rohit S. Chandramouli, Enrico Barausse
https://arxiv.org/abs/2510.06948

When vacuum breaks: a self-consistency test for astrophysical environments in extreme mass ratio inspirals
Gravitational-wave signals are typically interpreted under the vacuum hypothesis, i.e. assuming negligible influence from the astrophysical environment. This assumption is expected to break down for low-frequency sources such as extreme mass ratio inspirals (EMRIs), which are prime targets for the Laser Interferometer Space Antenna (LISA) and are expected to form, at least in part, in dense environments such as Active Galactic Nuclei or dark-matter spikes/cores. Modeling environmental effects p…

The Masses of Fermions in the context of the Supersymmetric $SU(3)_{C}\times SU(3)_{L}\times U(1)_{N}$ Model
M. C. Rodriguez
https://arxiv.org/abs/2508.11456 https://

The Masses of Fermions in the context of the Supersymmetric $SU(3)_{C}\times SU(3)_{L}\times U(1)_{N}$ Model
We will study in details the masses spectrum of fermions of the Minimal Supersymmetric $SU(3)_{C}\times SU(3)_{L}\times U(1)_{N}$ Model. We will consider the case in which all the usual neutral scalars fields of this model obtain vacuum expectation values, in both case when we have $R$-parity conservation, respect the invariance of the quantum number, ${\cal F}\equiv B+L$, where $B$ is the baryon number while $L$ is the total lepton number, and the oppposite ones, it means $R$-parity violation.…

Bumblebee vector-tensor dark energy
Carsten van de Bruck, Mohammad Ali Gorji, Nils A. Nilsson, Masahide Yamaguchi
https://arxiv.org/abs/2509.11647 https://…

Bumblebee vector-tensor dark energy
Bumblebee models, a class of vector-tensor theories in which a vector field acquires a nonzero vacuum expectation value that spontaneously breaks spacetime symmetries, are ubiquitous in the literature. In this paper, we highlight several often-overlooked properties of these models by analyzing their cosmological perturbations. We show that a non-minimal coupling to gravity is essential for the stability of the setup. However, avoiding propagation of a ghost mode then requires imposing a relatio…

Singularities as Solitons? Quantum Vacuum Architecture of Black Holes
Eren Erberk Erkul
https://arxiv.org/abs/2510.06428 https://arxiv.org/pdf/2510.06428…

Singularities as Solitons? Quantum Vacuum Architecture of Black Holes
We propose that black holes are \emph{soliton-esque} objects, where gravitational collapse is balanced by quantum vacuum dispersion, modeled via \(R+αR^{2}\) gravity. Classical singularities are replaced by oscillating, finite-radius cores, thereby evading static no-go theorems. The event horizon is replaced by the \textit{Lamarina}, a surface of maximum redshift whose surface geometry yields Hawking-like radiation with corrections. The Raychaudhuri equations impose a Dyson-type ceiling on the…

Field-theoretic versus data-driven evaluations of electromagnetic corrections to hadronic vacuum polarization in $(g-2)_\mu$
Volodymyr Biloshytskyi, Dominik Erb, Harvey B. Meyer, Julian Parrino, Vladimir Pascalutsa
https://arxiv.org/abs/2509.08115

Field-theoretic versus data-driven evaluations of electromagnetic corrections to hadronic vacuum polarization in $(g-2)_μ$
The Standard Model prediction of the muon $g-2$ increasingly depends on lattice QCD computations of the hadronic vacuum polarization (HVP), where the isospin-breaking (IB) effects remain a significant source of uncertainty. To complement the lattice QCD evaluations, the data-driven approach to HVP has been used to assess some of the electromagnetic IB effects, in particular from the channels with a photon in the final state, e.g., $e^+e^-\toπ^0 γ$. Here we argue that such contributions are la…

Microscopic Theory of Heat Transfer across a Vacuum
Yue-Hui Zhou, Jie-Qiao Liao
https://arxiv.org/abs/2508.02351 https://arxiv.org/pdf/2508.02351

Microscopic Theory of Heat Transfer across a Vacuum
Heat transfer is a fundamental concept in physics, and how to characterize the microscopical physical mechanism of heat transfer is a significant topic. Recently, a new mechanism for heat transfer, phonon heat transfer across a vacuum through quantum fluctuations, has been experimentally demonstrated in a two-vibrating-membrane system. However, a microscopic quantum electrodynamics theory behind this phenomenon remains unexplored. Here, we establish the nonrelativistic microscopic theory of pho…

Quantum Vacuum energy as the origin of Gravity
Andr\'e LeClair
https://arxiv.org/abs/2509.02636 https://arxiv.org/pdf/2509.02636

Quantum Vacuum energy as the origin of Gravity
We explore the idea that quantum vacuum energy $ρ_{\rm vac} $ is at the origin of Gravity as a theoretical exercise. We formulate a gravitational version of the electromagnetic Casimir effect, and provide an argument for how gravity can arise from $ρ_{\rm vac} $ by showing how Einstein's field equations emerge in the form of Friedmann's equations. This leads to the idea that Newton's constant $G_N$ is environmental, namely it depends on the total mass-energy of the Universe $M_\infty $ and it…

Monotonicity of Causal Killing Vectors and Geometry of ADM Mass Minimizers
Sven Hirsch, Lan-Hsuan Huang
https://arxiv.org/abs/2510.10306 https://arxiv.org/…

Monotonicity of Causal Killing Vectors and Geometry of ADM Mass Minimizers
We address two problems concerning the ADM mass-minimizing initial data sets. First, we show that the equality case of the positive mass theorem embeds into a pp-wave spacetime. Second, we show that positive Bartnik mass minimizers embed into strongly stationary vacuum spacetimes, thereby confirming the Bartnik stationary vacuum conjecture. A key ingredient is a new monotonicity formula for the Lorentzian length of a causal Killing vector field, which, among other applications, yields a strong …

The Spin-Spin Dynamics of Glueballs
A. M. Badalian, M. S. Lukashov
https://arxiv.org/abs/2509.13830 https://arxiv.org/pdf/2509.13830

The Spin-Spin Dynamics of Glueballs
The masses of pure gauge glueballs are calculated with the use of relativistic string Hamiltonian without fitting parameters. The string tension $σ_f=0.184$~GeV$^2$ in fundamental representation is fixed, using the Necco-Sommer lattice data, and to calculate the vector coupling $α_{\rm V}(r)$ the value of $Λ_{\overline{MS}}^0=238$~MeV ($N_f=0$) is taken. The spin-spin potential, defined via the vacuum correlation function, is shown to produce a screening effect and decrease a hyperfine split…

Logarithmically Divergent Vacuum Energy in Effective Field Theory
Jonathan Sullivan-Wood, Craig Pryor
https://arxiv.org/abs/2507.21320 https://arxiv.org/pd…

Logarithmically Divergent Vacuum Energy in Effective Field Theory
The vacuum energy density due to a single quantum field diverges quarticly with the ultraviolet cutoff $Λ$, in wild disagreement with the value implied by cosmological observations. We show that in effective field theories containing bosons and fermions the requirement of a Lorentz invariant vacuum makes any divergence faster than logarithmic exponentially unlikely. We show this by generating an ensemble of mass spectra by Monte Carlo, and find that the probability distribution function for th…

Properties of a deformed Myers-Perry black hole
Shohreh Abdolrahimi, Matin Tavayef
https://arxiv.org/abs/2509.13050 https://arxiv.org/pdf/2509.13050…

Properties of a deformed Myers-Perry black hole
Considering an exact solution of the five-dimensional Einstein equations in vacuum space, which represents a distorted Myers-Perry black hole with a single angular momentum, we investigate how the distortion affects the horizon surface of this black hole. We illustrate a special case where we have a bumpy deformed black hole horizon that feels the presence of the external sources. However, the ergosphere is oblivious to the presence of external sources.

Direct Nuclear-Level Qubits using Trapped Th-229 Ions: A Platform for Entanglement and Universal Quantum Information Processing
Jingbo Wang, Haixing Miao, Shiqian Ding, Dong E. Liu
https://arxiv.org/abs/2508.10626

Direct Nuclear-Level Qubits using Trapped Th-229 Ions: A Platform for Entanglement and Universal Quantum Information Processing
The low-energy isomeric transition in Thorium-229 offers a unique interface between nuclear and atomic physics, presenting a resource for quantum technologies that is notably resilient to environmental decoherence. While early experiments focused on nuclei in solid-state crystals, the recent advent of a continuous-wave vacuum ultraviolet laser at 148.4~nm now enables direct coherent control of individual trapped Th-229 ions. Building on this breakthrough, we present a theoretical framework for …

Past and future isotropization in $f(R)$ dark energy models
Adnaan Nauthoo, Peter Dunsby, \'Alvaro de la Cruz-Dombriz
https://arxiv.org/abs/2509.12300 https://

Past and future isotropization in $f(R)$ dark energy models
We perform the dynamical system analysis for the homogeneous and anisotropic Bianchi I cosmology in the context of Hu-Sawicki $f(R)$ gravity with parameters $\{n,C_{1}\}=\{1,1\}$. Deriving the corresponding four-dimensional dynamical system from the field equations allows us to find the fixed points of the system in both the vacuum and matter cases alongside their stability. This approach also provides analytical expressions for both the cosmic expansion and shear of each fixed point. We show t…

Non-conformally Einstein instantons in Conformal Gravity with and without nonlinear matter fields
Crist\'obal Corral, Borja Diez, Eleftherios Papantonopoulos
https://arxiv.org/abs/2510.11854

Non-conformally Einstein instantons in Conformal Gravity with and without nonlinear matter fields
In this work, we study non-conformally Einstein gravitational instantons in four-dimensional Conformal Gravity, both in vacuum and in the presence of nonlinear conformal matter. First, the one-parameter extension of the Kerr-NUT-AdS metric is analyzed. We obtain their conserved charges by using the Noether-Wald formalism. It turns out that they receive corrections from the linear modes present in Conformal Gravity, which are properly identified. Then, we perform the analytic continuation into t…

The sixth order QED radiative corrections to lepton anomalies due to the fourth order vacuum polarization insertions within the Mellin-Barnes representation
L. P. Kaptari, V. I. Lashkevich, O. P. Solovtsova
https://arxiv.org/abs/2508.05119

The sixth order QED radiative corrections to lepton anomalies due to the fourth order vacuum polarization insertions within the Mellin-Barnes representation
The explicit form of the sixth order radiative corrections to the lepton $L$ ($L=e, ~μ$ and $τ$) anomalous magnetic moment from QED Feynman diagrams with insertion of the fourth-order polarization operators consisting of either two closed lepton loops or one lepton loop crossed by a photon line is discussed in detail. The approach is based on the consistent application of dispersion relations for vacuum polarization operators and the Mellin-Barnes transform for massive photon propagators. Exp…

Metrological power of single-qubit dynamical Casimir effect in circuit QED
A. P. Costa, H. R. Schelb, A. V. Dodonov
https://arxiv.org/abs/2508.10182 https://

Metrological power of single-qubit dynamical Casimir effect in circuit QED
We consider a nonstationary circuit QED system described by the quantum Rabi model, in which an artificial two-level atom with a tunable transition frequency is coupled to a single-mode resonator. We focus on regimes where the external modulation takes the form $\sin[η(t) t]$, with the modulation frequency $η(t)$ varying slowly and linearly in time near $2ν$ and $4ν$, $ν$ being the resonator frequency. Starting from the vacuum state, we numerically compute the Quantum Fisher Information fo…

Long-time behaviour of sphalerons in $\phi^4$ models with a false vacuum
Stephen C. Anco, Danial Saadatmand
https://arxiv.org/abs/2510.04283 https://arxiv.…

Long-time behaviour of sphalerons in $ϕ^4$ models with a false vacuum
Sphalerons in nonlinear Klein-Gordon models are unstable lump-like solutions that arise from a saddle point between true and false vacua in the energy functional. Numerical simulations are presented which show the sphaleron evolving into an accelerating kink-antikink pair whose separation approaches the speed of light asymptotically at large times. Utilizing a nonlinear collective coordinate method, an approximate analytical solution is derived for this evolution. These results indicate that an…

Vacuum Cherenkov radiation for nonminimal dimension-5 Lorentz violation
A. Yu. Petrov, M. Schreck, A. R. Vieira
https://arxiv.org/abs/2508.21212 https://ar…

Vacuum Cherenkov radiation for nonminimal dimension-5 Lorentz violation
Vacuum Cherenkov radiation is investigated in the Lorentz-violating Standard-Model Extension for isotropic dim-5 operators $\hat{m}$ and $\hat{a}^μ$ in the fermion sector. Both the kinematics and dynamics of this process are analyzed by analytical and numerical means, leading to its decay and radiated-energy rates as functions of the initial-fermion momentum. We adopt the point of view that vacuum Cherenkov radiation is actually a physical phenomenon expected to occur for a charged, massive fe…

The $\theta$-vacuum from functional renormalisation
Yuepeng Guan, Jan M. Pawlowski, Masatoshi Yamada
https://arxiv.org/abs/2507.22318 https://arxiv.org/pdf…

The $θ$-vacuum from functional renormalisation
We study topological properties of a quantum mechanical system with $U(1)$-symmetry within the functional renormalisation group (fRG) approach. These properties include the vacuum energy structure and the topological susceptibility. Our approach works with a complexification of the flow equation, and specifically we embed the original symmetry into the complex plane, $U(1)\rightarrow \mathbb{C}$. We compute the effective potential of a given topological sector by restricting ourselves to field …

Time delay in matched exterior and interior Kottler solutions
Mourad Guenouche
https://arxiv.org/abs/2509.11049 https://arxiv.org/pdf/2509.11049

Time delay in matched exterior and interior Kottler solutions
We extend the study of gravitational lensing to photons traversing the lens mass, modeled as a uniform-density fluid described by the interior Kottler (Schwarzschild--de Sitter) solution smoothly matched to the exterior Kottler region. An analytic expression for the time delay is derived, allowing the interior contribution to be explicitly isolated relative to the vacuum Kottler case. This correction is found to systematically enhance the total time delay, an effect corroborated by numerical ev…

4D de Sitter from 6D gauged supergravity with Green-Schwarz counterterm
Xu Guo, Yi Pang, Ergin Sezgin
https://arxiv.org/abs/2510.11794 https://arxiv.org/pd…

4D de Sitter from 6D gauged supergravity with Green-Schwarz counterterm
Taking into account the Green-Schwarz anomaly counterterm in R-symmetry gauged $N=(1,0)$ supergravity in six dimensions, and the associated modification in the Maxwell kinetic term and potential, we observe that the theory admits half-supersymmetric Minkowski$_4\times S^2$ and non-supersymmetric dS$_4 \times S^2$ as exact solutions with a monopole on $S^2$. The monopole charge and the anomaly coefficients play key roles in the vacuum structure and it turns out that a diagonal gauging in which a…

Collective motion in the massive Schwinger model via Tensor Network
Haiyang Shao, Shile Chen, Shuzhe Shi
https://arxiv.org/abs/2509.10835 https://arxiv.org…

Collective motion in the massive Schwinger model via Tensor Network
We simulate the real-time dynamics of a massive Schwinger model using the Time-Evolving Block Decimation tensor network algorithm. Starting from a non-equilibrium initial state with localized energy excitation on top of vacuum, we track the subsequent evolution to investigate two distinct physical phenomena. First, by analyzing the system's energy-momentum tensor, we show that this system exhibits hydrodynamic behavior analogous to Bjorken flow at large coupling-to-mass ratio, a signature that …

General approach to vacuum nonsingular black holes: exact solutions from equation of state
O. B. Zaslavskii
https://arxiv.org/abs/2509.00899 https://arxiv.…

General approach to vacuum nonsingular black holes: exact solutions from equation of state
We consider spherically symmetric static black hole configurations that obey the vacuum equation of state: $p_{r}=-ρ$, where $p_{r}$ is the radial pressure, $ρ$ being energy density. We find in a closed form the metric for an arbitrary equation of state for tangential pressure $p_{θ}(ρ)$. The corresponding formulas enable us to embrace compact Schwarzschild-like configurations and dispersed systems. They include metrics with a regular center and singular ones. In a particular case, the metr…

Solving the Trans-Planckian Censorship Problem with a Power-law Tail in $R^2$ Inflation: A Dynamical System Approach
S. D. Odintsov, V. K. Oikonomou, Eleni I. Manouri, Asterios T. Papadopoulos
https://arxiv.org/abs/2509.11387

Solving the Trans-Planckian Censorship Problem with a Power-law Tail in $R^2$ Inflation: A Dynamical System Approach
In this work we elaborate on solving the trans-Planckian censorship problem of standard slow-roll inflation by using a power-law inflationary tail generated by a scalar field with an exponential potential. We use a quantitative approach by studying in detail the phase space of a combined $F(R,ϕ)$ cosmological system, focusing on the de Sitter and power-law subspaces of the total phase space. As we show, the de Sitter subspace of the $F(R,ϕ)$ system shares the same fixed points as the vacuum $…

Spontaneous excitation of a centripetally accelerated atom coupled to electromagnetic vacuum fluctuations near a reflecting boundary
Yan Peng, Jiawei Hu, Hongwei Yu
https://arxiv.org/abs/2509.16488

Spontaneous excitation of a centripetally accelerated atom coupled to electromagnetic vacuum fluctuations near a reflecting boundary
We investigate the rate of change of the mean atomic energy for centripetally accelerated atoms interacting with electromagnetic vacuum fluctuations near a reflecting boundary, using the Dalibard-Dupont-Roc-Cohen-Tannoudji formalism. The distinct contributions from vacuum fluctuations and radiation reaction are analyzed separately. Our results reveal that, when the centripetal acceleration significantly exceeds the characteristic acceleration set by the atomic transition frequency, vacuum fluct…