444 papers
This paper investigates the generation of primordial stochastic gravitational waves during the reheating period by calculating the perturbative decay of a coherently oscillating inflaton into massive spin-3/2 particles accompanied by graviton bremsstrahlung, demonstrating that the resulting gravitational wave spectra can provide insights into the microscopic physics of inflation.
This paper demonstrates that the thermal nature of Hawking radiation in gravity is the double-copy dual of charge thermality in non-abelian gauge theory, where the radiation spectrum is thermal in color charge eigenvalues rather than energy, emerging from the product of a Planck-like factor and a Wigner semicircle color phase space density.
This paper proposes a new worldsheet action for entanglement entropy in AdS/CFT that derives Einstein equations, interprets bit threads as string charge densities, and unifies the Susskind-Uglum conjecture, open-closed string duality, and ER=EPR by linking open and closed string charges to entanglement and Bekenstein-Hawking entropy respectively.
This paper presents a fully numerical backward ray-tracing framework to compute and visualize the three-dimensional "hypershadow" of five-dimensional black holes, validating its application on Schwarzschild-Tangherlini and Myers-Perry geometries to analyze symmetry, observer dependence, and spin effects while establishing a foundation for studying exotic objects like black rings.
This paper investigates the stability thresholds of de Sitter and Minkowski spacetimes in holographic semiclassical gravity across dimensions , revealing that stability depends critically on the spacetime dimension and a specific dimensionless parameter , with Minkowski spacetime being universally unstable in , both spacetimes becoming unstable in beyond a critical threshold, and both remaining stable in except where higher-curvature corrections dominate.
This paper presents a model-independent Bayesian search for double-peaked stochastic gravitational-wave backgrounds in LIGO-Virgo-KAGRA O1–O4a data, finding no significant evidence but establishing crucial constraints and a framework for future targeted spectral shape analyses.
This study extends previous research on eccentricity-induced systematic biases in binary neutron star parameter estimation to include spin effects, revealing that while biases in chirp mass, mass ratio, and effective spin follow predictable quadratic trends with eccentricity, biases in effective tidal deformability exhibit a complex dependence on mass and spin parameters, potentially impacting neutron star property inference.
This study develops a rigorous, nonperturbative framework to quantify how mirror birefringence and polarization misalignment degrade sensitivity in axion-like particle searches, revealing that while misalignment effects can be mitigated through postselection, birefringence introduces a distinct high-mass resonance peak that necessitates careful consideration in high-precision optical-cavity experiments.
This paper develops a general canonical quantization scheme for -essence cosmology using the Dirac-Bergmann algorithm to derive a Wheeler-DeWitt equation, which is then applied to a tachyonic field model to investigate phantom crossing via quantum tunneling and the effects of boundary conditions on singularity avoidance and expansion rates.
This paper introduces a new black hole solution sourced by a string fluid with integrable singularities and establishes general junction conditions for matching such interior regions to exterior geometries, demonstrating that these conditions ensure temperature continuity while pressure discontinuities signal phase transitions.
This study proposes a novel, tighter generalized entropic uncertainty relation for multi-measurements in many-body systems and applies it to Schwarzschild black holes to reveal the exact equivalence between entanglement and -norm coherence in GHZ-type states, while demonstrating how increasing Hawking temperature degrades quantum coherence and maximizes measurement uncertainty.
This paper extends Jacobson's thermodynamic derivation of gravity to non-extensive horizon entropies by introducing a Topological Calibration Principle that links the effective gravitational coupling to the Euler characteristic of spacetime sections, thereby providing a framework to constrain non-extensive parameters and explore cosmological implications.
This paper demonstrates that strong non-gravitational interactions between dark matter and dark energy, which allow for negative energy densities, can naturally drive flat FLRW cosmologies to undergo either a Big Crunch turnaround or a non-singular bounce, and cyclic evolution in closed universes, without requiring modifications to general relativity.
This paper demonstrates that the orbital eccentricity of massive black hole binaries significantly enhances LISA's parameter estimation capabilities, leading to a substantial increase in the number of bright standard sirens and resulting in markedly tighter cosmological constraints on parameters such as the Hubble constant and dark energy.
This paper investigates gravitational reheating in the Starobinsky model within the Jordan frame, demonstrating that particle production driven by Ricci scalar oscillations leads to a reheating temperature of approximately $2 \times 10^9$ GeV and highlighting how quantum effects can yield distinct microphysical interpretations and quantitative predictions compared to the Einstein frame.
This paper uncovers new nonlinear facets of gravity within the Einstein-Klein-Gordon system, demonstrating higher harmonic generation, spectral broadening, and focusing, while showing that weak frequency sensitivity in vacuum wave scattering at quadratic order helps explain the smooth behavior of black hole mergers yet cautions against overly simplistic waveform interpretations.
This monograph explores the mathematical foundations of Special Relativity in flat spacetime, with a specific focus on the Lorentz group and its applications to mechanics and electrodynamics.
This study investigates the evolution of inflationary black holes coupled to the cosmological background via a generalized McVittie geometry within Starobinsky's inflation model, finding that only those with a specific initial mass range can survive Hawking evaporation and avoid runaway growth to persist today as sub-solar mass objects.
This paper employs a distributional formalism to derive generalized junction conditions for arbitrary gravitational theories based on curvature invariants, establishing specific continuity requirements for the Riemann tensor and its derivatives that determine the existence of thin shells, gravitational double layers, or impulsive waves.
This paper presents the first analytic solutions for nearly equatorial, plunging orbits of spinning test particles in Kerr spacetime, providing closed-form corrections to the innermost bound circular orbit and a novel parametrization to aid in modeling gravitational waveforms.