439 papers
This paper classifies the intrinsic Killing symmetries of null hypersurfaces in general relativity up to the fourth order using triad calculus and differential invariants, providing normal forms for each type and discussing their application to horizons.
This paper establishes a universal relation between the energy-momentum tensor two-point function coefficient and the Weyl anomaly coefficient in generic even-dimensional conformal field theories, deriving the result through both holographic methods utilizing a Chern-Gauss-Bonnet formula and a genuine CFT approach based on renormalization group running.
This paper investigates the perturbative renormalization and classical dynamics of the bumblebee model coupled to quadratic gravity, demonstrating that Lorentz symmetry violation induced by a vector field's vacuum expectation value modifies the theory's UV structure while still permitting exact Schwarzschild and de Sitter solutions.
This paper proposes that CDM cosmology, including radiation-dominated and accelerated expansion phases, can emerge from a minimal fractional extension of Newtonian gravity characterized by a single deformation parameter that is constrained to be very close to unity by observational data.
This paper investigates the geodesic structure, shadow, thermodynamics, and Hawking radiation of a dyonic ModMax black hole within Kalb-Ramond gravity coupled to a cloud of strings, demonstrating how the interplay of nonlinear electrodynamics, Lorentz violation, and string sources modifies key observables and produces a phenomenology distinct from standard Reissner-Nordström black holes.
This paper presents a systematic investigation of one-loop mass corrections for Type II string massive higher-spin states on the first Regge trajectory, deriving closed-form expressions for the relevant integrals, regularizing infrared divergences via the -prescription, and computing mass shifts up to level while speculating on random matrix theory governing the resulting mass matrix.
This paper proposes a class of inhomogeneous relativistic cosmological models where matter behaves like quasi-dust, demonstrating that local gravitational potential backreaction can generate an effective dark-energy term that mimics cosmic acceleration in observations while the universe remains fundamentally decelerating.
This paper utilizes the Euclidean Gravity approach to demonstrate that spatially varying near-horizon temperature fluctuations in a Schwarzschild Black Hole are intrinsically linked to near-horizon supertranslations, allowing the derivation of temperature-dependent corrections to the free energy and a microscopic partition function that describe low-energy horizon physics as a sum over these supertranslations.
This paper formulates a quasi-local analogue of the first law of black hole thermodynamics for general closed marginally trapped surfaces in arbitrary spacetimes, deriving a balance law that relates energy variations to heat and work contributions without relying on a preferred horizon worldtube.
This study investigates how dark matter and non-magnetized plasma influence the shadow and photon orbits of a Kerr-like black hole, revealing that while dark matter has negligible effects, plasma density significantly alters shadow size and deformation depending on its distribution profile, with these findings being constrained by Event Horizon Telescope observations of M87* and Sgr A*.
This paper extends the study of booklet wormholes as the holographic dual of the GHZ state by demonstrating that their symmetry necessitates special bulk Killing vectors and unprecedented quantum non-local junction conditions, while also proposing a mechanism to render them traversable through boundary deformations that distribute information via entanglement.
This paper presents a novel exact solution in Freund-Nambu scalar-tensor gravity that generalizes the Janis-Newman-Winicour naked singularity spacetime, analyzing its impact on particle dynamics and accretion to derive the first observational constraints on the model's parameters using twin-peak quasi-periodic oscillation data from microquasars.
This paper demonstrates that modified Geometrothermodynamics (GTD) metrics, unlike their conventional counterparts, consistently respect physical boundaries of the thermodynamic phase space in AdS spacetime and across different ensembles when applied to Bardeen AdS black holes, thereby establishing the framework's robustness and universality.
This paper demonstrates that autoparallel curves associated with torsion-free, non-metric-compatible affine connections can be derived from a variational principle by explicitly constructing an action functional through the systematic solution of the inverse problem of the calculus of variations and the associated Helmholtz conditions.
This paper investigates warm inflation beyond the Markovian limit by demonstrating that finite correlation times in thermal baths generate colored noise which suppresses the primordial scalar power spectrum, thereby establishing a direct link between non-Markovian memory effects and the ratio of bath temperature to the Hubble scale while quantifying their impact on key cosmological observables.
This paper investigates the quantum stability of a timelike topological wormhole by computing the one-loop backreaction of a massive scalar field, finding that depending on finite counterterms, quantum effects can either stabilize or destabilize the structure while preserving its traversability.
This paper investigates the black hole shadow in a renormalization group-improved Bonanno-Reuter spacetime within a plasma medium, using Event Horizon Telescope observations of Sgr A* to constrain quantum gravitational parameters while highlighting the current observational degeneracy between plasma and quantum-gravity effects.
This paper presents the first systematic study of early-to-late cosmic evolution in gravity, demonstrating that a well-motivated model constrained by Big-Bang Nucleosynthesis bounds and supernova data successfully reproduces the observed late-time acceleration with quintessence-like behavior while remaining consistent with early-time physics.
This paper computes the frequency-domain gravitational waveform for hyperbolic extreme-mass-ratio scattering up to the fifth post-Minkowskian order, demonstrating its physical equivalence to existing quantum amplitude results at the 3PM level while providing new benchmarks for higher-order calculations, evaluating gravitational wave memory, and improving the knowledge of radiated energy to the sixth post-Newtonian order.
This paper constrains a specific Dark Energy model using differential age data and applies it to study the continuous mass growth of Schwarzschild black holes through accretion and mergers within the standard hierarchical formation scenario.