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General Relativity and Quantum Cosmology papers — page 91

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Does Eternal Inflation Violate the Smeared Null Energy Condition?
The smeared null energy condition (SNEC) imposes a semilocal bound on the negative energy accumulated along null geodesics. In eternal inflation, rare stochastic upward fluctuations of the inflaton…
Dong-Hui Yu, Yong CaiJun 6, 2026
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Rotation-Induced Effective Anisotropy in White Dwarfs as a Newtonian Benchmark with Relativistic Scale Assessment
We develop a one-dimensional Newtonian reduction for uniformly rotating cold white dwarfs in which the angle-averaged centrifugal support is represented by an effective anisotropic term. From the…
Aray Muratkhan, Aliya Taukenova, Saken Toktarbay et al.Jun 6, 2026
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Renormalization-group improved Schwarzschild black hole: shadow, ringdown, and strong cosmic censorship
A renormalization-group (RG) improved Schwarzschild-like black hole (BH) is studied here, with a lapse that interpolates between a classical Schwarzschild exterior and a quantum-smoothed interior set…
Ahmad Al-Badawi, Faizuddin Ahmed, İzzet SakallıJun 6, 2026
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Energy-momentum and dark energy in SU(∞)-QGR quantum gravity
SU(∞) Quantum GRavity (QGR) is a recently proposed fundamentally quantum approach to gravity and cosmology. In this model the Hilbert space of the Universe represents SU(∞) symmetry.…
Houri ZiaeepourJun 6, 2026
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Hotspot Images from Magnetic Reconnection Processes in the plunging Region of a Kerr Black Hole
Employing the hotspot imaging technique, this work investigates the plasma motion trajectories prior to and following the Comisso-Asenjo mechanism within the plunging region. After a concise overview…
Xiao-Xiong Zeng, Yun Hong, Ke WangJun 6, 2026
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Traversable Wormhole Solutions in massive F(T) gravity
We study traversable wormhole geometries in an F(T) teleparallel framework augmented by a perturbative de Rham-Gabadadze-Tolley (dRGT) graviton-mass term. Adopting the static, spherically symmetric…
Alexandre Landry, Yassine Sekhmani, Sunil K Maurya et al.Jun 6, 2026
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Spacetime Bartnik Mass Positivity and Temporal Monotonicity for Black Holes
We define a quasilocal mass of Bartnik type, and establish its positivity and temporal monotonicity properties for two classes of domains associated with black holes. More precisely, we first show…
Lars Andersson, Marcus Khuri, Marc Mars et al.Jun 5, 2026
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Stochastic scalar-tensor inflation and beyond
During cosmological inflation, inhomogeneities arising from quantum vacuum fluctuations are stretched to become super-Hubble and effectively classical. As many scenarios of the origin involve…
Yoann LaunayJun 5, 2026
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Red noise and evolving signals: a complete frequentist approach to supermassive black hole binary searches with pulsar timing arrays
Searches for gravitational waves (GWs) from isolated supermassive black hole binaries (SMBHBs) in pulsar timing array (PTA) data require simultaneous estimation of signal and noise parameters, so the…
Xuan Tao, Boris Goncharov, Yiqian Qian et al.Jun 5, 2026
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Loss of the scaling attractor in self-gravitating domain wall networks
Domain-wall(DW) networks are known to approach a relativistic scaling regime on fixed radiation- and matter-dominated backgrounds, forming the basis of the no-frustration conjecture. However, this…
Zhen-Min ZengJun 5, 2026
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From (Hidden) Symmetries to Stealth Solutions
In a recent paper, Arxiv:2605.23077, we have demonstrated that (conformal) Killing vectors give rise to stealth vector solutions of a specific bumblebee-type Proca theory supplemented by fine tuned…
David Kubiznak, Robert B. Mann, Marek MiličkaJun 5, 2026
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Vanishing of all redshift modes in Schwarzschild ringdown
Several studies of black hole ringdown from particles plunging into black holes have identified contributions decaying at integer multiples of the surface gravity, called redshift modes, horizon…
Adrien Kuntz, Matteo Della RoccaJun 5, 2026
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Fuzzy-novae
We propose a novel phenomenological model of quantum gravitational collapse inspired by loop quantum gravity that ensures a completely regular spacetime evolution. By incorporating quantum…
Francesco Fazzini, Waleed SherifJun 5, 2026
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Accelerating scaling solutions from dark matter particle creation
This article opens new window to obtain accelerating scaling attractors without any need of dark energy. We study cosmological dynamics in a two-fluid system where pressureless dark matter (DM)…
Sudip Halder, Jaume de Haro, Supriya Pan et al.Jun 5, 2026
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Dynamical Black Hole Thermodynamics in Modified Gravity
We investigate the dynamical and thermodynamic evolution of a Schwarzschild black hole in Modified Gravity (MOG) perturbed by a scalar gravitational wave breathing mode. By evaluating the linearized…
Nikko John Leo S. Lobos, Emmanuel T. RodulfoJun 5, 2026
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Distinguishing Black Holes and Neutron Stars via Optical Images Illuminated by Thick Accretion Disks
This paper investigates the optical images of neutron stars within the framework of the radiatively inefficient accretion flow model, taking into account a polytropic equation of state. After…
Chen-Yu Yang, Xiao-Xiong ZengJun 5, 2026
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Melvin--Bonnor and Bertotti--Robinson spacetimes with Baryonic charge
In this work, we exploit a dictionary that maps solutions of the Einstein--Scalar--Maxwell theory to those of gauged Skyrme--Maxwell--Einstein models in (3+1) dimensions, allowing gravitating…
José Barrientos, Fabrizio Canfora, Adolfo Cisterna et al.Jun 5, 2026
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Thermodynamic and Dynamical Properties of Phantom Charged Black Holes in 4D Einstein-Gauss-Bonnet Gravity
We present charged black hole solutions of regularized four dimensional Einstein Gauss Bonnet gravity coupled to a phantom electromagnetic field. We investigate the combined effects of higher…
Bilel HamilJun 5, 2026
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Cosmological perturbations in Energy-Momentum Squared Gravity
We present a fully covariant and gauge-invariant analysis of linear cosmological perturbations in Energy-Momentum Squared Gravity. Working within the 1+3 formalism, we derive the exact propagation…
Peter K. S. Dunsby, Maria-Alexia Caldis, Eduardo BittencourtJun 5, 2026
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Quantum spacetime from constraints: wave equations and fields
In previous works, we showed that both time and space can emerge from entanglement within a globally constrained quantum Universe, with no background coordinates. By extending the Page and Wootters…
Tommaso FavalliJun 5, 2026
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Resonant interactions from dynamical perturbers on generic orbits around an extreme mass ratio inspiral
Extreme mass-ratio inspirals (EMRIs) are binary systems where a compact object slowly inspirals into its much larger compact partner. Since we anticipate such systems to exist within and be…
Makana Silva, Harrison G. Blake-Goszyk, Christopher M. HirataJun 5, 2026
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Correlation and Data-Analysis Distinctiveness of Time-Delay Interferometry Configurations
Time-Delay Interferometry (TDI) is essential for space-based gravitational wave (GW) missions, as it suppresses laser frequency noise and achieve the required sensitivity. Beyond the standard…
Gang WangJun 5, 2026
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Entropy in Loop Quantum Cosmology
The Generalized First Law (GFL) and the Generalized Second Law (GSL) of thermodynamics are studied for cosmological scenarios with spatial curvature through an apparent horizon. We focus on effective…
Alejandro Corichi, Omar GallegosJun 5, 2026
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Radial Oscillations of Viscous Stars at Finite Temperature
We study the radial oscillation spectrum of relativistic stars within Israel-Stewart and Navier-Stokes theories, extending previous analyses to include heat diffusion and a thermodynamically…
Amanda Guerrieri, Gabriel S. Rocha, Gabriel S. Denicol et al.Jun 4, 2026
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Measuring a Black Hole's Area Immediately after Merger: A Direct-Wave Test of Hawking's Area Law
Black-hole area is the geometric variable behind horizon thermodynamics. We introduce a gravitational-wave method to infer a Kerr-equivalent horizon area from direct waves in the near-merger signal,…
Adrian Ka-Wai Chung, Kelvin Ka-Ho Lam, Anna Liu et al.Jun 4, 2026
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