Comparing accretion disk profiles of Bogush-Galt'sov naked singularity and Kerr black holeIt is well known that the Einstein-scalar system of general relativity can in principle yield non-unique exact spinning naked singularities, which lead to unique Kerr black hole when the scalar field…R. Kh. Karimov, R. N. Izmailov, A. A. Potapov et al.·Jun 26, 2026SaveLearn
Quantum fluxes and Φ2 for a non-minimally coupled scalar field: ringdown and tail on approaching the polar Kerr inner horizonWe compute Φ2ren as well as the energy fluxes Tuuren and Tvvren (where u and v are the standard…Maria Alberti, Noa Zilberman, Marc Casals et al.·Jun 26, 2026SaveLearn
Testing generalized spacetimes for black holes using the Hod function representation of the hoop conjectureThe hoop conjecture, due to Thorne, is a fundamental aspect of black holes in classical general relativity. Recently, generalized classes of regular spherically symmetric static black holes with…K. K. Nandi, R. N. Izmailov, R. Kh. Karimov et al.·Jun 26, 2026SaveLearn
New interpretation of the Minkowski limit of R2 gravityIt is well-established that the Minkowski limit of pure f(R)=R2 gravity breaks down, unlike that of full Starobinsky theory f(R)=R+αR2. We provide a novel interpretation of this phenomenon…Valerio Faraoni, Luca Gallerani, Alain Maltais-Gosselin et al.·Jun 26, 2026SaveLearn
A Lagrangian formulation for Rastall gravity and a covariant formulation for unimodular gravityWe propose a Lagrangian formulation for a non-conservative gravity model in which the divergence of the energy-momentum tensor in curved spacetime does not vanish. This is accomplished by introducing…Juilson A. P. Paiva, Julio C. Fabris, Vilson T. Zanchin·Jun 26, 2026SaveLearn
Can a regular black hole be observationally distinguished from singular black holes as spinning lens partner in PSR-BH binaries?To answer the question posed in the title, we consider a novel diagnostic, viz., the difference in the times of arrival (TOA) at the observer of two light rays that simultaneously emanate from a…G. Y. Tuleganova, R. Kh. Karimov, R. N. Izmailov et al.·Jun 26, 2026SaveLearn
First Demonstration of Optical Feedback Control to Parametric Instability at Advanced LIGOIncreasing the circulating power in gravitational-wave detectors to the megawatt level is essential for future sensitivity improvement, but this is critically limited by optomechanical parametric…Juntao Pan, Carl Blair, Vladimir Bossilkov et al.·Jun 26, 2026SaveLearn
Gravitational Wave Energy Emitted in the Head-On Collision of Two Black HolesWhat is the spectrum of gravitational radiation produced by the head-on collision of two equal-mass black holes? The emission is dominated by low frequency bremsstrahlung, producing a flat energy…Nesibe Derin Sivrioglu, Robert R. Caldwell·Jun 26, 2026SaveLearn
Phase-resolved field-space distance criteria in ekpyrotic, bouncing and cyclic cosmologiesThe inflationary Lyth bound relates the primordial tensor amplitude to the inflaton field excursion. In ekpyrotic, bouncing and cyclic cosmologies there is no analogous universal…Marcin Postolak·Jun 26, 2026SaveLearn
Dynamical Casimir Effect and Vacuum Friction in the Near-Horizon Geometry of a Black HoleWe investigate the Dynamical Casimir Effect (DCE) for a relativistic scalar field confined within a cavity possessing moving boundaries in the (1+1)-dimensional near-horizon geometry of a black hole.…Hamed Hadi, Amin Rezaei Akbarieh, Goksel Daylan Esmer·Jun 26, 2026SaveLearn
Acausal exact vacuum solutions in nonlocal gravityNonlocal gravity is a promising super-renormalizable or finite quantum gravity theory consistent with unitarity. In this paper, we focus on the classical equations of motion and explicitly show that…Zhe Zhao, Leonardo Modesto, Cosimo Bambi·Jun 26, 2026SaveLearn
A rotating GUP black hole: metric, shadow, and bounds on quantum parametersRecently, for the first time, a metric of a static spherically symmetric generalized uncertainty inspired quantum black hole was derived. We apply the modified Newman-Janis algorithm to this metric…Federica Fragomeno, Samantha Hergott, Saeed Rastgoo et al.·Jun 26, 2026SaveLearn
Strong deflection of massive particles via the geodesic deviation equationWe develop a formulation of the strong deflection limit for the scattering of particles following timelike geodesics in asymptotically flat, static, and spherically symmetric spacetimes. For fixed…Takahisa Igata, Yohsuke Takamori·Jun 26, 2026SaveLearn
Black hole shadows in nonminimally coupled Weyl connection gravityWe study black hole shadows in nonminimally coupled Weyl connection gravity, a metric-affine extension of general relativity in which spacetime is described by a metric and a Weyl vector field…Cláudio Gomes, Margarida Lima, Francisco S. N. Lobo et al.·Jun 26, 2026SaveLearn
The continuum spectrum of nonrelativistic multi-frequency Proca starsMulti-frequency Proca stars are excited selfgravitating solutions of the s=1 Schrödinger-Poisson system that generalize the conventional stationary states of a massive vector field. Unlike…Galo Diaz-Andrade, Alberto Diez-Tejedor, Jose Luis Medina-Garcia et al.·Jun 26, 2026SaveLearn
Inspiral tests of general relativity and waveform geometryThe phase evolution of gravitational waves encodes critical information about the orbital dynamics of binary systems. In this work, we test the robustness of parameterized tests against unmodeled…Brian C. Seymour, Jacob Golomb, Yanbei Chen·Jun 26, 2026SaveLearn
Relativistic framework for high-precision GNSS processing in GCRS/BCRS with extension to cislunar spaceWe present an implementation-oriented relativistic modeling framework for high-precision GNSS processing consistent with the IAU-adopted Barycentric and Geocentric Celestial Reference Systems…Slava G. Turyshev, Yoaz E. Bar-Sever, William I. Bertiger·Jun 26, 2026SaveLearn
Finite Populations & Finite Time: The Non-Gaussianity of a Gravitational Wave BackgroundStrong evidence for an isotropic, Gaussian gravitational wave background (GWB) has been found by multiple pulsar timing arrays (PTAs). The GWB is expected to be sourced by a finite population of…William G. Lamb, Jeremy M. Wachter, Andrea Mitridate et al.·Jun 26, 2026SaveLearn
GWTC-4.0: Updating the Gravitational-Wave Transient Catalog with Observations from the First Part of the Fourth LIGO-Virgo-KAGRA Observing RunVersion 4.0 of the Gravitational-Wave Transient Catalog (GWTC-4.0) adds new candidates detected by the LIGO, Virgo, and KAGRA observatories through the first part of the fourth observing run (O4a:…The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration et al.·Jun 26, 2026SaveLearn
GWTC-4.0: An Introduction to Version 4.0 of the Gravitational-Wave Transient CatalogThe Gravitational-Wave Transient Catalog (GWTC) is a collection of short-duration (transient) gravitational wave signals identified by the LIGO-Virgo-KAGRA Collaboration in gravitational-wave data…The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration et al.·Jun 26, 2026SaveLearn
Extreme mass-ratio inspirals and extra dimensions: Insights from modified Teukolsky frameworkExtreme mass-ratio inspirals (EMRIs) offer a promising avenue to test extra-dimensional physics through gravitational wave (GW) observations. In this work, we study equatorial eccentric EMRIs around…Shailesh Kumar, Tieguang Zi, Arpan Bhattacharyya·Jun 26, 2026SaveLearn
Reverse Isoperimetry from Boundary--Completed Canonical EnergyThe reverse isoperimetric conjecture states that, at fixed thermodynamic volume, Schwarzschild--AdS black holes maximize entropy. We show that its local fixed-volume form admits a boundary-completed…Naman Kumar·Jun 25, 2026SaveLearn
Quantum corrections to symmetron fifth forces for planar sourcesWe provide a semi-analytic calculation of the first quantum corrections to the symmetron fifth force around a planar source with nonzero thickness. We find a suppression of the fifth force compared…Peter Millington, Michael Udemba·Jun 25, 2026SaveLearn
Dynamics of Relativistic Binaries in Structured and Stochastic Environments: A Lagrange-Fourier-Hansen FrameworkWe develop a general framework to characterize non-vacuum perturbations to relativistic binaries in the gravitational-wave (GW) driven regime, for use in GW parameter estimation studies. The effect…Lorenz Zwick, Conor Dyson, Brian C. Seymour et al.·Jun 25, 2026SaveLearn
Determination of the metric of a Schwarzschild black hole surrounded by a halo of dark matterFollowing the landmark acquisition of the first image of a black hole, systems comprising a black hole enveloped by a dark matter halo have attracted considerable attention. This work implements a…M. Castillo Alarcón, Leonel Bixano, I. A. Sarmiento-Alvarado et al.·Jun 25, 2026SaveLearn