444 papers
This paper demonstrates that introducing a left confining potential in Jackiw-Teitelboim gravity not only restores the required discrete spectral statistics to resolve the black hole entropy paradox but also dynamically prevents the indefinite growth of wormhole length, thereby resolving the black hole singularity.
This paper reviews the contributions of the late Manuele Filaci to the noncommutative geometry description of the Standard Model, demonstrating how minimal twists induce a Krein space structure on the spectral triple's Hilbert space and reveal the twistor symmetry group as a subgroup of the resulting unitary group.
This paper demonstrates that all two-dimensional Horndeski theories can be derived from higher-dimensional pure gravity reductions, leading to a Birkhoff theorem for a class of "quasi-topological" gravities that allows for the explicit reconstruction of any static, spherically symmetric, asymptotically flat spacetime satisfying specific metric conditions as a vacuum solution, including regular black holes like the Bardeen spacetime.
This paper establishes a flat-space holographic dictionary for free massive spinor fields in four-dimensional Minkowski spacetime by utilizing hyperbolic slicing to reduce the problem to effective systems, thereby deriving universal two-point correlation functions for dual spinning operators on the celestial sphere and clarifying the construction of spinor conformal primary wavefunctions.
This paper investigates the constraint analysis and quantization of two-dimensional Thomas-Whitehead gravity using dynamical light-cone and ADM formalisms, demonstrating that introducing dynamics to the diffeomorphism field resolves the issue of vanishing Hamiltonians inherent in the standard effective Polyakov action.
Zurek and Page investigate thermodynamic equilibrium of a self-gravitating perfect fluid surrounding a black hole using the Tolman-Oppenheimer-Volkoff equation, discovering a singular solution where the fluid forms a high-density "firewall" near the Schwarzschild radius surrounding a negative point mass rather than a horizon, with entropy comparable to the Bekenstein-Hawking limit.
This paper advocates for a Bayesian statistical framework based on timescale analysis to derive the most rigorous constraints on ultralight boson masses and self-interactions from black hole spin measurements, demonstrating its application to both stellar-mass and supermassive black holes while highlighting the need for standardized data sharing in the field.
This study employs a two-fluid formalism and Bayesian analysis of multimessenger data to investigate how linear and quadratic scalar and vector dark matter interactions influence the structure, compactness, and equation of state of dark matter admixed neutron stars, revealing that vector repulsion and quadratic scalar couplings significantly alter stellar properties compared to standard models.
Using Pantheon+, DESy5, and DESI-DR2 data, this study finds that generalized entropic gravity-thermodynamic models are significantly disfavored compared to the standard CDM model, with the data favoring standard Bekenstein-Hawking entropy and a three-parameter formulation over more complex variants.
This paper demonstrates that third-generation ground-based gravitational wave detectors, such as the Einstein Telescope and Cosmic Explorer, can effectively distinguish between bare primordial black holes and dressed primordial black holes surrounded by dark matter using Bayesian model selection on lensed gravitational wave signals.
This study utilizes the Bogoliubov approach in a ring-shaped Bose-Einstein condensate to demonstrate that quantum depletion increases with Hawking temperature due to horizon dynamics, revealing a critical threshold where backreaction effects challenge the approximation's validity while identifying a viable parameter regime for experimental investigation.
This study estimates that the cumulative gravitational wave signal from recurring "peep" bursts of highly eccentric extreme mass ratio inspirals could either cause a minor increase in the LISA noise floor or, in more abundant scenarios, create a detectable background that significantly obscures other potential sources.
Using the Parkes Pulsar Timing Array's third data release, this study fails to confirm the supermassive black hole binary candidate in 3C 66B, instead establishing upper limits that partially rule out electromagnetic parameter estimates while proposing a new joint likelihood framework for multimessenger analysis and standard siren applications.
This paper reformulates the photon surface condition in spherical symmetry as a non-autonomous dynamical system to demonstrate its extension along null radial geodesics, applying this framework to a collapsing dust cloud to show that the photon surface uniquely continues as a null hypersurface into the interior spacetime, thereby enabling an analytical investigation of singularity coverage in the LTB model.
This paper establishes a central theorem that determines the necessary conditions on metric functions for the finiteness of all curvature invariants at the origin of static, spherically symmetric black holes, thereby defining the differentiability class and extendibility of such spacetimes in a model-independent, non-linear regime.
This paper extends a geometry-first formulation of the Standard Model to spontaneous symmetry breaking and Yukawa couplings, demonstrating how these mechanisms can be explained through purely geometric terms that offer a more general and transparent account of charge quantization than traditional symmetry-based approaches.
This paper demonstrates that Tsallis cosmology, when applied within both the Cai-Kim thermodynamic framework and the holographic dark energy scenario, yields pathological behaviors such as negative energy densities and violations of early-universe constraints for any deviation from the standard extensive limit, thereby restricting viable models to the standard CDM cosmology.
This paper examines the ongoing debate surrounding large-scale bulk flows in the universe, highlighting the persistent discrepancies between observed high-velocity coherent motions and the predictions of the standard CDM model, which pose significant challenges for theoretical explanations and may have influenced both structure formation and astronomical observations.
This paper investigates the backreactions of null matter loading onto the stable photon sphere in Weyl conformal gravity, revealing that the sphere's area remains invariant and that a critical loading threshold can generate an extremal horizon with AdSS geometry, a phenomenon distinct from standard nonconformal metrics.
This paper establishes a new thermodynamic third-law analog for the repetitive electric Penrose process, demonstrating that a Reissner-Nordström black hole's charge cannot be reduced to exactly zero through a finite number of iterative steps.