439 papers
This paper mathematically and graphically evaluates the effective gravitational potentials, circular orbits, and Innermost Stable Circular Orbits (ISCOs) of neutral and charged particles around Schwarzschild, Kerr, Reissner-Nordström, and Kerr-Newman black holes, revealing how electromagnetic interactions and gravitational radiation influence orbital stability and energy loss.
This paper proposes an analytic, non-singular slow-roll inflation model where the conformal anomaly mechanism resolves the classical pressure singularity, generates extreme particle creation for reheating without inflaton oscillations, and enhances primordial black hole formation and secondary gravitational waves.
This paper extends the standard gravitational baryogenesis framework beyond the spectator approximation by treating the curvature-matter coupling as a genuine variational problem, deriving the resulting modified field equations and cosmological dynamics to establish a consistent baseline for analyzing baryogenesis in both standard and modified gravity scenarios.
This paper presents a fast emulation framework for the matter power spectrum in a binned phenomenological modified gravity model, demonstrating that combining large-scale structure with CMB lensing data enables precise Bayesian constraints on the effective gravitational constant and gravitational slip across redshift bins.
This paper presents a comprehensive analysis of a screened Simpson-Visser regular black hole with an asymptotically de-Sitter core, investigating its thermodynamic stability, geodesic structure, observational signatures like shadows and ISCOs, and topological properties to elucidate the interplay between its modified geometry and physical behavior.
This paper proposes an amortized simulation-based inference method using neural posterior estimation for gravitational-wave ringdown analysis, demonstrating that it achieves statistically consistent parameter estimates orders of magnitude faster than traditional Markov-chain methods while revealing that transient noise contamination significantly biases mass and spin estimates, particularly when glitches occur during the signal's tail.
This paper proposes a novel formulation of four-dimensional gravity derived from a topological field theory with global symmetry that becomes local, utilizing Weyl spinor-valued 1-forms to encode frame-field data and offering a framework particularly well-suited for discretization and quantization.
This paper proposes a targeted search method for supermassive black hole binaries using Pulsar Timing Arrays to overcome sky localization limitations, demonstrating that the Chinese Pulsar Timing Array alone could measure the Hubble constant with 2 km/s/Mpc precision to help resolve the Hubble tension.
This paper introduces a computationally efficient "shifted-geodesic" framework that approximates gravitational-wave fluxes from spinning bodies orbiting Kerr black holes by incorporating leading spin effects into orbital frequencies while retaining the global structure of geodesic motion, offering a pragmatic tool for rapid EMRI/IMRI flux calculations and LISA parameter-space studies with minimal dephasing error.
This paper proposes a quantum mechanical model of black hole decay via fuzzy sphere tunneling mediated by monopole zero modes, demonstrating that this unitary process reproduces the semi-classical Hawking radiation rate and Boltzmann distribution while offering a framework to determine the full wave function of the emitted quanta.
This paper establishes a consistent renormalization framework within the Effective Field Theory of inflation that successfully cancels ultraviolet divergences and tadpoles for scale-dependent backgrounds with strong de Sitter symmetry breaking, demonstrating that the renormalized one-loop power spectrum vanishes at both large and small scales for resonant and sharp features while preserving perturbativity.
This paper investigates energy extraction mechanisms and particle collisions around a rotating dyonic black hole in , gauged supergravity, demonstrating that the gauge coupling constant can significantly enhance Penrose process efficiency and enable infinite center-of-mass energy for extremal cases, thereby positioning this black hole as a more powerful Planck-scale collider than standard Kerr black holes.
This study forecasts that the Euclid mission will significantly constrain the Hu-Sawicki modified gravity parameter , achieving approximately 1% precision when combining spectroscopic and photometric probes and enabling the distinction of these models from the standard CDM cosmology at greater than 3 confidence.
This paper analyzes the orbital motion of a test particle in the McVittie spacetime using local coordinates and osculating elements to demonstrate that while cosmological expansion does not affect the orbit's size up to second order, it induces a time-dependent precession and alters the mean orbital frequency, with the precession direction determined by the Hubble and deceleration parameters.
This paper demonstrates that a class of emergent universes can be obtained in a flat Friedmann-Lemaitre-Robertson-Walker model with general bulk viscous dissipation proportional to , where the condition is sufficient but not necessary for such a universe to exist.
By analyzing the higher-order gravitational-wave modes in the GW190412 signal, this study demonstrates the first complete measurement of a black-hole merger's recoil direction, ruling out low kick magnitudes and providing precise constraints on the kick's orientation relative to the orbital angular momentum and line-of-sight.
This paper proposes a microscopic explanation for the statistical entropy of general observed 4D black holes by compactifying 5D Einstein gravity with a positive cosmological constant, successfully deriving the Bekenstein-Hawking area term along with novel, physically significant sub-leading exponential corrections independent of specific black hole symmetries or supersymmetry.
This paper theoretically investigates the light deflection caused by a topologically charged Holonomy corrected Schwarzschild black hole in both weak and strong field limits, deriving analytical expansions and observables to facilitate the identification of these solutions through gravitational lensing observations.
This study investigates how incorporating higher-order post-Newtonian tidal corrections up to 7.5 pN affects the measurement accuracy of neutron star tidal deformability using the Fisher Matrix method, revealing that these corrections do not exhibit convergence behavior and that measurement precision improves with higher effective spin and stiffer equations of state.
This paper investigates the cosmological implications of an affine equation of state within General Relativity and gravity, demonstrating that while both frameworks can unify the universe's transition from decelerated to accelerated expansion, the affine model yields quintessence-like dark energy in General Relativity but phantom-like dark energy in gravity, with parameters constrained by Cosmic Chronometer and Supernovae type Ia data.