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General Relativity and Quantum Cosmology papers — page 10

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Quantum-gravity-inspired Alcubierre warp-drive geometries
String T-duality, through its correspondence with path-integral duality, endows the low-energy propagator with a zero-point length l0=2πα' that softens the short-distance behavior of…
Kimet Jusufi, Francisco S. N. LoboSep 3, 2026
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Does spatial curvature generate new thermodynamic criticality at the FLRW apparent horizon?
We generalize the apparent-horizon thermodynamic construction of [1] to a FLRW universe with non-zero spatial curvature, non-interacting cold dark matter and holographic-type dark energy. For nonzero…
Samuel Lepe, Joel SaavedraSep 3, 2026
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Exact solution of the Klein-Gordon equation in a Kiselev black hole background
In this work, we investigate exactly the dynamics of a relativistic spinless particle influenced by a static and uncharged black hole surrounded by a quintessence-like anisotropic fluid or Kiselev…
Matheus. D. de Oliveira, Alexandre G. M. SchmidtSep 3, 2026
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From Nonmetricity Operators to the Physical Spectrum: A Branch-Complete Analysis of Local Four-Derivative Symmetric Teleparallel Gravity
We develop a branch-complete classical free-spectrum analysis of local parity-even symmetric teleparallel gravity containing all pure-gravity nonmetricity operators through four derivatives. After…
Caglar PalaSep 3, 2026
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Screened Scalar Hair and the Weak-Lensing Separation of Black Holes from Neutron Stars in Quadratic f(R) Gravity
Quadratic f(R) gravity carries a massive scalar degree of freedom, the scalaron, whose finite range λ screens its influence on the geometry outside a compact object. We show that this screening…
Yashmitha Kumaran, Ilídio LopesSep 3, 2026
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An Attractor-Repeller model of the Local Universe : The Λ-Szekeres spacetime and Perturbation Theory
The standard linearly perturbed Friedmann-Lemaître-Robertson-Walker (FLRW) framework provides an accurate description of the Universe on large scales but cannot fully capture the non-linear…
Maharshi Sarma, Christian Marinoni, Basheer KalbounehSep 3, 2026
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Waveform models for the gravitational-wave memory effect: III. Phenomenological frequency-domain model for nonspinning binaries
We present a phenomenological frequency-domain model for the gravitational-wave (GW) memory signal from nonspinning binary-black-hole mergers on quasicircular orbits. We develop separate amplitude…
Arwa Elhashash, David A. NicholsSep 3, 2026
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Emergent dark sector in group field theory cosmology
We develop an analytical treatment of the emergent cosmological dynamics induced by local polynomial interactions in a deparametrised group field theory model, moving beyond the usual non-interacting…
Andrea Calcinari, Federico Greco, Daniele Oriti et al.Sep 3, 2026
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Dyonic rotating cosmological black hole surrounded by quintessence
In this work, we constructed a new metric describing a rotating cosmological black hole with electric and magnetic charges in the presence of quintessence dark energy, where the cosmological constant…
M. D. de Oliveira, Alexandre G. M. SchmidtSep 3, 2026
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An off-shell conformally invariant Galilean Weyl tensor
We propose a manifestly conformally invariant off-shell definition of the Weyl tensor in Galilean geometry. We also propose definitions for the electric and magnetic parts thereof. For the latter to…
Quentin Vigneron, Philip K. Schwartz, James ReadSep 3, 2026
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Black holes in alternative theories of gravity
Black holes, with their strong gravitational fields, provide an important testing ground for theories of gravity beyond General Relativity. Among the many proposed alternatives, considerable recent…
Jose Luis Blázquez-Salcedo, Fech Scen Khoo, Burkhard Kleihaus et al.Sep 3, 2026
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Eight Local Couplings of Gravitational Waves from Unified Field Equations
A gravitational-wave (GW) detector records a linear mixture of local couplings under the assumption that extra polarizations enter geodesic deviation. Vacuum general relativity (GR) admits two…
Hong-Bo Jin, Yue-Liang WuSep 3, 2026
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On the interplay between waveform systematics and lensing signatures in gravitational-wave signals
The exceptional gravitational-wave event GW231123 exhibited unusually high total mass and near-extremal spins, while revealing strong waveform-dependent variations in its inferred source properties.…
Disha Hegde, Justin JanquartSep 3, 2026
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Not All Resonances Are Created Equal: Prioritizing Tidal Resonances in EMRIs
Tidal perturbations from nearby compact objects can drive resonant "kicks" in extreme-mass-ratio inspirals (EMRIs), imprinting potentially detectable phase shifts in LISA-band gravitational…
Béatrice Bonga, Patrick Bourg, Bram ten Brink et al.Sep 3, 2026
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Long-lived ringing of Bronnikov--Kim brane-world black holes and wormholes
Massive-field perturbations on black-hole and wormhole backgrounds can form long-lived quasinormal ringing; this behaviour is not confined to brane-world spacetimes, but it is also not universal…
Milena SkvortsovaSep 3, 2026
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Dynamical Selection of Horizon-BMS Goldstone Modes in Evaporating Black Holes
We investigate the dynamics of horizon soft degrees of freedom associated with near-horizon BMS supertranslations in an evaporating Vaidya-Schwarzschild black hole spacetime. Considering the dynamic…
Nihar Ranjan Ghosh, Malay K. NandySep 3, 2026
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Solutions for neutron stars in General Relativity from a complexity structure scalar boundary condition
A new condition involving the complexity factor, a structure scalar arising from the orthogonal splitting of the Riemann tensor, is generated at the boundary of a spherically symmetric anisotropic…
Robert S. Bogadi, Megandhren Govender, Genly Leon et al.Sep 3, 2026
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Introducing SINFONIA: Symplectic, slimplectic and Magnusian (Neural) Flows for Orbital Numerical Integration and Acceleration
Long-duration gravitational-wave modelling must resolve fast orbital motion together with slow dissipative evolution while preventing small numerical errors from accumulating into secular phase…
Lidia J. Gomes Da SilvaSep 3, 2026
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Tidal forces in the quantum Oppenheimer--Snyder black hole
We investigate the tidal forces experienced by massive particles in radial free fall in the quantum Oppenheimer--Snyder black hole, a loop quantum gravity correction to the Schwarzschild geometry…
Anuar Idrissov, Hernando QuevedoSep 3, 2026
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Constraint closure and gravitational-wave content of shear-free cosmologies in metric f(R) gravity
We derive the consistency conditions governing the propagating content of linear shear-free perturbations of Friedmann-Lema\ıtre-Robertson-Walker cosmologies in metric f(R) gravity. The divergence…
Mudhahir Al Ajmi, Amare AbebeSep 3, 2026
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Non-extensive entropy signatures in compact star
The non-extensive entropy models applied to the black-hole horizon are connected to the generalized Einstein--Hilbert action, f(R), via the Wald entropy formalism. We demonstrate that quark star…
B. N. Jayawiguna, M. H. Al Ghifari, A. Rohim et al.Sep 3, 2026
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Exceptional points and the breaking of Schwarzschild isospectrality under local potential perturbations
The odd- and even-parity gravitational perturbations of a Schwarzschild black hole are governed by the distinct Regge-Wheeler and Zerilli potentials, yet their quasinormal-mode (QNM) spectra are…
Mohamed Ould El HadjSep 2, 2026
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Evolving wormhole cosmology: modified Friedmann dynamics and observational constraints
We construct an evolving wormhole cosmological model from a Morris--Thorne metric with a separable, time-dependent shape function in a spatially flat Friedmann--Lemaitre--Robertson--Walker…
Aritra Sanyal, Kazuharu Bamba, Prabir RudraSep 2, 2026
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Coherent multipath wave response on Reissner-Nordström analogue surface
To uncover how the intrinsic metric of a relativistic compact object governs macroscopic wave phenomena, we establish a theoretical framework mapping the charge dependent spatial geometry of a…
Peng-Yu Chen, Sen Guo, Qing-Quan Jiang et al.Sep 2, 2026
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Relativistic transformation of temperature for exotic cosmological fluids
We study the relativistic transformation of temperature for effective cosmological fluids with negative pressure within a covariant thermodynamic framework. The Lorentz transformation of temperature…
Soroor Pouryazdan, Babak VakiliSep 2, 2026
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