377 papers
This paper establishes a conformal scattering theory for defocusing semilinear wave equations on Schwarzschild spacetime by combining energy decay estimates with Sobolev embeddings to construct a bounded, locally Lipschitz scattering operator that maps past to future scattering data.
This paper establishes new mean curvature rigidity theorems for spin fill-ins with non-negative scalar curvature by employing two distinct spinorial techniques—an APS boundary value problem extension and an index-theoretic comparison—to resolve questions posed by Miao and Gromov, while also deriving a novel Witten-type mass inequality for asymptotically Schwarzschild manifolds.
This paper proposes a definition of asymptotically flat spacetimes consistent with gravitational scattering and proves three antipodal matching conditions at spatial infinity, which are reformulated as asymptotic conservation laws governing tails and the breaking of peeling.
This paper presents a proper-time method to analytically construct and demonstrate the stability of secondary gravitational waves as perturbative solutions against a strong gravitational wave background in the Bianchi VI universe.
This paper presents an all-orders worldline effective action for Kerr-Newman black holes within twistor particle theory and identifies exact hidden symmetries in self-dual backgrounds.
This paper demonstrates that single scalar field theories minimally coupled to a Carrollian connection and invariant under extended Carrollian transformations, including supertranslations, cannot support propagating modes because these symmetries force the energy density to be static and the momentum density to vanish.
This paper demonstrates how introductory physics students can use thermodynamic principles, specifically the analogy between black hole area and entropy, to derive bounds on energy emitted during black hole mergers and understand how these concepts are applied in modern gravitational wave research.
This paper demonstrates that while gravitational wave dephasing caused by gas accretion in massive black hole binaries will likely bias the inference of other LISA signals due to imperfect vacuum-template subtraction, the resulting residual is unlikely to be confidently distinguished from instrumental noise as a stochastic signal.
This paper presents a unified analytic treatment of Kerr-Newman-de Sitter black holes in constant-curvature gravity, deriving closed-form expressions for horizon radii and extremality conditions to reveal non-universal bounds and unique ultra-extremal configurations that differ from general relativity.
This paper establishes that for Einstein's gravity coupled to a massive, non-minimally coupled quantum scalar field, each term in the equation of motion for metric perturbations and each necessary renormalization counterterm independently satisfies a Noether-Ward identity, ensuring the overall transversality of the equation regardless of the specific definition used for the metric perturbation.
This paper proposes realistic models within scalar-Einstein-Gauss-Bonnet and ghost-free gravity frameworks that explain recent DESI observations of an inverse phantom crossing in the dark energy equation of state, either through standard phantom crossing mechanisms or via an "apparent" crossing where dark matter density decreases more slowly due to coupling with the Gauss-Bonnet invariant, all while preserving energy conditions.
Using cross-correlation data from Advanced LIGO and Advanced Virgo during their third observing run, this study establishes a $95\%0.01~M_\odot c^2$ on the gravitational-wave energy emitted by core-collapse supernovae, representing a two-order-of-magnitude improvement over previous constraints and suggesting that third-generation detectors will likely detect individual supernova events before the gravitational-wave background.
This paper proposes that compact, non-singular horizonless objects characterized by a regulator length scale support stable inner orbits that generate observable very-high-frequency quasi-periodic oscillations (VHFQPOs) ranging from 1 kHz to 25 kHz, suggesting that the absence of such signals in X-ray binaries would confirm the existence of an event horizon around the central object.
This paper establishes a consistent vierbein perturbation framework for New General Relativity to analyze cosmological modes, revealing that Type 3 of the theory possesses five stable propagating modes (tensor, scalar, and vector) that make it particularly suitable for cosmological applications despite its violation of local Lorentz invariance.
This paper presents a fully relativistic framework for cosmological simulations that incorporates curved spatial geometry by embedding a spherical cap of curved spacetime into a flat exterior to solve boundary condition issues, thereby enabling consistent forward modelling of observables over large distances with minimal modifications to existing Newtonian codes.
This paper proposes a general series-based pseudo-Newtonian potential with tunable coefficients that can be customized to accurately replicate specific Schwarzschild geodesic features, such as the innermost stable circular orbit, marginally bound orbits, and periapsis advance, outperforming existing models like the Paczynski-Wiita potential.
This paper proposes a novel Local Maxima Particle Swarm Optimization (LMPSO) algorithm to simultaneously detect thousands of low signal-to-noise Galactic binary gravitational wave signals, effectively overcoming signal subtraction contamination and achieving a lower false alarm rate than existing iterative methods.
Using Dark-Matter-only -body simulations from the IllustrisTNG project, this study computes the frame-dragging gravito-magnetic vector potential on galactic scales, finding it to be two orders of magnitude larger than perturbation theory predicts yet remaining a subdominant $0.1\% \sim 1\%\Lambda$CDM model.
This paper investigates whether observed local cosmic expansion anisotropies can be explained by an off-center observer in the Lemaître-Tolman-Bondi framework by comparing exact relativistic luminosity distances with covariant cosmographic approximations and linear perturbation theory to establish a consistent dictionary for interpreting large-scale gravitational field anisotropies beyond the standard FLRW model.
Using Cosmicflows-4 and Pantheon+ data, this study measures a few-percent anisotropic expansion rate fluctuation in the local Universe dominated by a dipole that decreases with redshift, interprets these multipoles within covariant cosmography as driven by specific higher-order parameters, and demonstrates that this model-independent framework can accurately reconstruct luminosity distances up to without assuming peculiar velocities.