Conformal Cyclic Cosmology from Varying Fundamental ConstantsWe investigate a bimetric cosmological model in which the gravitational and matter sectors are described by distinct metrics related through a time-dependent function α(t). This relation leads to…Konrad Marosek, Adam Balcerzak·Aug 27, 2026SaveLearn
Perturbations of black holes with primary hair: time evolutions, quasinormal modes and greybody factorsIn this work we study gravitational perturbations of black holes carrying primary scalar hair in shift-symmetric beyond-Horndeski gravity. By focusing on the axial sector, we study the geometric…Georgios Antoniou·Aug 27, 2026SaveLearn
Gravitational Lensing of Hayward Black Holes with EFT-Corrected Photon PropagationWe investigate whether a Hayward regular black hole can be observationally distinguished from a Schwarzschild black hole through strong gravitational lensing when effective field theory (EFT)…Takamasa Kanai·Aug 27, 2026SaveLearn
Near-Horizon BMS Symmetry and Implications on Black Hole EntropyThermodynamic significance of near-horizon symmetries remains an important open question in black hole physics, particularly in the context of black hole evaporation and information recovery. In this…Nihar Ranjan Ghosh, Malay K. Nandy·Aug 27, 2026SaveLearn
Relativistic Modeling for Solid Earth Tide Estimation via Space-to-Ground Clock ComparisonWith the rapid development of modern atomic clock technology, their unprecedented precision elevates them from timekeeping tools to gravitational potential sensors, thereby fostering the highly…Qin Li, Wei-Hang Sun, Yu-Jie Tan et al.·Aug 27, 2026SaveLearn
Comparison of Two-Atom Cross Spectra in de Sitter Spacetime, Uniformly Accelerated Minkowski Vacuum, and a Thermal BathWe study the weak coupling of two identical two-level atoms to a four-dimensional massless conformally coupled scalar field and compare three settings with the same local temperature but different…Zhiming Huang·Aug 27, 2026SaveLearn
Gödel-type universes in Lorentz-violating Kalb-Ramond gravity with Ricci- and Riemann-tensor nonminimal couplingsThis paper studies homogeneous -type geometries in a gravitational model where local Lorentz symmetry is spontaneously broken by the vacuum expectation value of an antisymmetric Kalb-Ramond…Fernando M. Belchior·Aug 26, 2026SaveLearn
Born Geometry, Metaparticles, and an Effective Geometric Realization of the Modular Black-Hole Remnant: A Phase-Space Resolution of the Schwarzschild SingularityRecent work on metaparticle black-hole thermodynamics suggested the existence of a finite evaporation endpoint characterized by a minimal horizon area, a maximal Hawking temperature, and a stable…Paul-Robert Chouha·Aug 26, 2026SaveLearn
Effects of the interaction of dark matter and neutron-star matter on extreme and intermediate mass-ratio inspiralsExtreme and intermediate mass-ratio inspirals in a dense dark-matter distribution have the effects of the dark matter imprinted on the orbital dynamics of and the emitted gravitational waves from…Benjamin A. Wade, Julian Heeck, David A. Nichols·Aug 26, 2026SaveLearn
Validating Timing-Model Accuracy for Continuous Gravitational Waves: A Comparison of LALSuite and PINTWe present results of a systematic validation of the timing model for continuous gravitational waves against πnt, a modern high-accuracy pulsar-timing package. An accurate timing…Kartikey Sharma, Reinhard Prix, Maria Alessandra Papa et al.·Aug 26, 2026SaveLearn
Torsion balances as operational probes of semiclassical gravity: Matched-filter bounds, torque-diffusion constraints, and quantum-noise benchmarksCalibrated torsion-balance spectra constrain deterministic and stochastic deviations from standard Newtonian gravity. Using one-sided spectra, we derive a calibrated angle-equivalent noise budget and…Jyotirmaya Mohanta, Yutaka Shikano·Aug 26, 2026SaveLearn
Atmospheric Newtonian noise in torsion-balance measurements of the gravitational constant GMeasurements of Newton's gravitational constant remain limited by environmental and apparatus-dependent systematics whose treatment is often less explicit than that of instrumental noise. Among…Jyotirmaya Mohanta, Yutaka Shikano·Aug 26, 2026SaveLearn
Mode stability for the Klein-Gordon equation on subextremal Kerr-de Sitter spacetimesWe prove mode stability for the Klein-Gordon equation on Kerr-de Sitter black hole spacetimes in the full subextremal range and for the range m KG2∈[0,Λ2] of squared scalar field…Peter Hintz·Aug 26, 2026SaveLearn
Vacuum energy problem in anti-de Sitter spaceWe investigate the cosmological evolution of a universe with an initially large negative vacuum energy, corresponding to an anti-de Sitter (AdS) space-time. Such a universe inevitably contracts and…E. V. Arbuzova, A. D. Dolgov·Aug 26, 2026SaveLearn
Reconstructing f(R) gravity from generalized entropies: exact LagrangiansGeneralized horizon entropies are widely used as theoretical modifications of the Bekenstein-Hawking area law, but through the Wald construction they may also encode modifications of the underlying…Ankit Anand, Sahil Devdutt, Kimet Jusufi et al.·Aug 26, 2026SaveLearn
Two-branch detector response for Dirac infall into a Schwarzschild--MOG black holeWe study a localized spin-1/2 detector falling into a Schwarzschild--MOG black hole. The detector interacts with a neutral massless scalar field through a charge-preserving two-level transition,…Nikko John Leo S. Lobos, Emmanuel T. Rodulfo·Aug 26, 2026SaveLearn
Pair creation in weak gravity and gauge backgrounds: spinning fields and binary starsWe study pair creation for quantum fields of spin 0, 1/2, and 1 in the presence of weak gravitational and gauge backgrounds. Using resummed heat-kernel techniques, we obtain closed expressions…S. A. Franchino-Viñas, N. Varacalli, O. Zanusso·Aug 26, 2026SaveLearn
Stationary Dirac condensates around Kerr black holesUltralight bosonic fields can form macroscopic clouds around rotating black holes, whereas the existence of analogous stationary fermionic condensates is strictly constrained by their intrinsic spin.…Sen Guo, Peng-Yu Chen, Yi-Han Huang et al.·Aug 26, 2026SaveLearn
A Generalized Class of Taub-NUT-Scalar MetricsWe consider a class of three-parameter metrics that was introduced in azizallahi2024three. The class of metrics contain Zipoy-Voorhees (ZV) and Fisher-Janis-Newman- Winicour (FJNW) spacetimes…Fataneh Bakherad, Behrouz Mirza, Reza Bahani et al.·Aug 26, 2026SaveLearn
A 3D Summation-by-Parts scheme on a Hyperboloidal Foliation of MinkowskiThis paper summarises our previous work on a fully 3D Summation-by-Parts scheme, derived for a class of linear wave equations on hyperboloidal slices on a fixed Minkowski background. The scheme is…Shalabh Gautam·Aug 26, 2026SaveLearn
The relationship between spacetime singularities and regions at infinityIdeal attached points are a core concept in general relativity for pseudo-Riemannian manifolds, and whether the spacetime can be extended with certain properties is a central consideration in their…Junbang Liu, Ben Andrews, Susan M Scott·Aug 26, 2026SaveLearn
Crudely Estimated Maximum Mass for a Cosmological Black HoleN-body simulations by M.~Milosavljevic and D.~Merritt Milosavljevic:2001vi suggest that for supermassive black hole binaries in their expected nearly circular orbits, before gravitational…Don N. Page·Aug 25, 2026SaveLearn
21-cm Brightness Temperature in a Unified-Dark-Sector Horndeski TheoryWe investigate the impact of scalar-tensor theories on the 21cm brightness temperature. We consider a specific model in Horndeski scalar-tensor theory in which dark matter and dark energy in the…Bertha Cuadros-Melgar, Thanasis Karakasis, Eleftherios Papantonopoulos et al.·Aug 25, 2026SaveLearn
Exact Integrable ΛCDM-Mimicking f(Q) Cosmology: Background, Stability, and Perturbations in the First Connection BranchWe re-examine the problem of mimicking the standard cosmological model, characterized by j=1 (where j is the cosmographic jerk parameter), within the context of the first connection branch of…Wompherdeiki Khyllep, Daniele Gregoris, Saikat Chakraborty et al.·Aug 25, 2026SaveLearn
Anti-Ultralocality and Plateau Models of InflationAnti-ultralocality refers to the growth of spatial gradient terms relative to velocity terms in the coupled Einstein--scalar field equations. It is a characteristic feature of decelerated expansion…Joshua Shterenberg, David Garfinkle, Anna I. Rosenzweig et al.·Aug 25, 2026SaveLearn