402 papers
This paper investigates a multi-field model within Loop Quantum Cosmology using a polymerized spacetime framework to derive quantum-corrected Friedmann equations, numerically analyzing the transition from a quantum bounce to slow-roll inflation and assessing the model's viability through stability and dynamical systems analyses.
This paper provides a complete local description of the moduli space of dynamical spherically symmetric black hole spacetimes near the Reissner-Nordström family, characterizing the black hole threshold as the extremal leaf of a foliation and establishing universal scaling laws with a critical exponent of $1/2$ alongside the activation of Aretakis instability for threshold solutions.
This paper demonstrates that while the "annihilation-to-nothing" scenario in the quantum Schwarzschild interior depends on specific factor ordering in standard quantization, the inclusion of minimal-length effects via a Generalized Uncertainty Principle suppresses this behavior, thereby challenging its robustness as a singularity resolution mechanism.
This paper investigates the dynamics of asymmetric binaries in scalar-tensor extensions of General Relativity by employing a new C++ code, STORM, to compute scalar-field fluxes for generic bound orbits, thereby advancing the construction of accurate waveform models for next-generation gravitational-wave detectors.
This paper investigates how coupling quasi-topological gravity to matter affects the regularity of spacetime solutions, demonstrating that while minimally coupled matter can disrupt the universal curvature bounds of the vacuum theory, specific stress-tensor conditions still ensure regularity, and non-minimal couplings can fully restore Markov's limiting curvature hypothesis with mass- and charge-independent curvature bounds.
This paper develops a systematic effective field theory framework to calculate model-independent corrections to the quasinormal modes of Kerr black holes with arbitrary spin, revealing that near-extremality corrections exhibit an oscillatory dependence on the logarithm of a dimensionless temperature parameter, indicative of an underlying discrete-scale-invariant structure.
This paper investigates the optical appearance and orbital dynamics of static spherically symmetric black holes sourced by a new Palatini-inspired nonlinear electrodynamics model, identifying key radii and observables such as shadow size and periastron advance to provide a reference framework for testing these solutions against current and future imaging and lensing data.
The CHRONOS paper proposes a next-generation cryogenic ground-based gravitational-wave observatory utilizing quantum non-demolition speed-meter technology to bridge the sub-Hz frequency gap, thereby enabling unprecedented long-duration tracking of compact binaries and precise constraints on the stochastic gravitational-wave background to advance astrophysics and cosmology.
This paper develops and applies the Batalin-Fradkin-Vilkovisky (BFV) formalism to quantize off-diagonal solutions of Einstein's equations on Lorentz manifolds with nonholonomic fibrations, demonstrating that these solutions encode Hořava-Lifshitz configurations with anisotropic scaling and effective cosmological constants in the quasi-classical limit.
This paper demonstrates that the chaos bound proposed in MSS can be violated in the spinor field of a Reissner-Nordström black hole by analyzing the orbital motions of both neutral and charged spinning particles, showing that sufficiently large spin magnitudes or specific spin-angular momentum alignments lead to Lyapunov exponents exceeding the surface gravity.
This paper presents the second release of the waveform catalog, featuring four high-resolution simulations of spinning binary black hole mergers that demonstrate high-fidelity gravitational waveforms with low mismatches suitable for next-generation detectors like LISA, Cosmic Explorer, and the Einstein Telescope.
Although a secondary potential barrier can induce a distinct family of spectrally unstable quasinormal modes that persist even after the barrier vanishes, time-domain simulations demonstrate that early-time black hole ringdown signals remain dominated by stable modes, thereby confirming the robustness of black hole spectroscopy.
This paper constructs a class of higher-dimensional asymptotically AdS black holes whose interiors exhibit bona fide chaotic BKL dynamics characterized by billiard-like motion in a -simplex, revealing new era structures for and a holographic thermal -function that tracks these epoch transitions.
This paper utilizes the unitary irreducible representations of the infinite-dimensional asymptotic symmetry groups of QED and gravity to encode universal infrared features of scattering processes and explores the construction of an infrared-finite -matrix by studying supermomentum eigenstates in contrast to the dressed-state approach.
This paper derives exact one-loop QED effective actions for scalar and spinor fields in global (anti-)de Sitter spacetime under a uniform electric field by utilizing the in-out formalism and Bogoliubov coefficients, revealing a strong interplay between electric fields and spacetime curvature while recovering known limits in pure (A)dS and Minkowski spaces.
This paper presents a rigorous Wheeler-DeWitt scattering formulation of the Quantum Big Bounce for a closed isotropic universe with an ekpyrotic potential, demonstrating that while a LQC-like scenario requires regularization due to high-energy divergences, an ekpyrotic scenario with reversed internal time flow remains well-posed at all energy scales, thereby avoiding the cosmological singularity within standard quantum mechanics.
This paper argues that the formation of a Schwarzschild black hole from a non-singular configuration cannot occur as a continuous process, as the geometry inevitably develops a "Minkowski breaking" discontinuity and curvature singularities before the point source forms, implying that black hole emergence requires a noncontinuous, possibly quantized, framework.
This paper demonstrates that geometric observables, such as length, measured by different inertial observers in Minkowski spacetime do not generically Poisson commute, a finding that offers significant insights into the potential existence of a fundamental scale in quantum gravity.
By expanding curvature tensors and recasting classical energy conditions as inequalities on metric perturbations, this study demonstrates that enforcing the strong, weak, null, and dominant energy conditions on a Schwarzschild background imposes significant angular restrictions on BMS supertranslations, thereby substantially reducing the space of physically admissible transformations despite their formal infinite dimensionality.
This paper demonstrates that negative dilaton hair in rotating Einstein-Maxwell-Dilaton-Axion black holes significantly enhances energy extraction efficiency and the rotational energy reservoir while expanding the parameter space for wave superradiance and preserving the Bañados-Silk-West divergence in particle collisions compared to standard Kerr black holes.