gr-qc papers | Gist.Science

One-loop renormalization of the effective field theory of inflationary fluctuations from gravitational interactions

This paper demonstrates that within the Effective Field Theory of inflation, one-loop gravitational corrections to primordial power spectra can be fully renormalized using dimensional regularization, resulting in exactly conserved scalar and tensor spectra on super-horizon scales and proving that propagation speeds remain immune to radiative corrections from gravitational nonlinearities.

Matteo Braglia, Lucas PinolWed, 11 Ma🔭 astro-ph

Cosmological Spacetimes with Sign-Changing Spatial Curvature and Topological Transitions

This paper investigates cosmological spacetimes where the spatial curvature $k$ is promoted to a time-dependent function, demonstrating that such sign-changing transitions—which allow for topological changes from closed to open universes while avoiding infinite initial energy densities—are consistent with global hyperbolicity under specific conditions and constructing three distinct geometries that exhibit these properties.

Gerardo García-Moreno, Bert Janssen, Alejandro Jiménez Cano, Marc Mars, Miguel Sánchez, Raül VeraWed, 11 Ma🔭 astro-ph

Relativistic Corrections to the Formation Rate of Extreme Mass-Ratio Inspirals

This paper presents a relativistically self-consistent analytic framework for estimating Extreme Mass-Ratio Inspirals (EMRIs) that, by generalizing the loss-cone angular momentum and revising the plunge pericenter in Schwarzschild spacetime, reveals that relativistic effects increase predicted event rates by approximately a factor of eight compared to Newtonian treatments, thereby underscoring their critical importance for space-based gravitational-wave detectors like LISA and Taiji.

Chen Feng, Yong TangWed, 11 Ma🔭 astro-ph

Deep Learning Search for Gravitational Waves from Compact Binary Coalescence

This paper proposes a hybrid deep learning approach that combines matched-filtering concepts with Convolutional Neural Networks to achieve detection efficiency comparable to standard methods while significantly reducing computational costs for future gravitational-wave searches.

Lorenzo Mobilia, Tito Dal Canton, Gianluca Maria GuidiWed, 11 Ma🔭 astro-ph

Binary Black Hole inspirals cannot hide their eccentricity

This paper introduces a fast, phenomenological method using time-frequency domain energy analysis and Bayesian-inspired sampling to rapidly constrain orbital eccentricity in binary black hole inspirals, demonstrating the ability to achieve estimates within 0.2 of the true value in just five minutes.

Johann Fernandes, Praveer Tiwari, Archana PaiWed, 11 Ma🔭 astro-ph

Dual Cutler-Vallisneri Corrections: Mitigating PSD Drift in Zero-Latency Gravitational-Wave Searches

This paper develops a perturbative framework extending the Cutler-Vallisneri formalism to derive analytic corrections for timing, phase, and SNR biases caused by power spectral density drift in zero-latency gravitational-wave searches, demonstrating that these corrections are essential to prevent significant sky-localization errors and detection losses when using minimum-phase whitening.

James KenningtonWed, 11 Ma🔭 astro-ph

Scalar shortcut to beyond-Kerr ringdown tests and their complementarity with black-hole shadow observations

This paper proposes a scalar shortcut method that uses exact scalar field quasinormal mode deviations as an accurate proxy for gravitational corrections in beyond-Kerr scenarios, demonstrating that current ringdown constraints can be comparable to or more stringent than black hole shadow observations while offering complementary tests of gravity.

Paolo Pani, Andrea P. SannaWed, 11 Ma🔭 astro-ph

Scattering from compact objects: Debye series and Regge-Debye poles

This paper investigates elastic scattering of massless scalar waves by horizonless compact objects in curved spacetime by introducing an exact Debye-series decomposition of the scattering matrix, which reveals how Regge-Debye pole spectra and branch-cut contributions govern scattering phenomena differently in neutron-star-like versus ultracompact regimes.

Mohamed Ould El HadjWed, 11 Ma🔭 astro-ph

Testing Screened Modified Gravity with Strongly Lensed Gravitational Waves

This paper develops a refined theoretical and statistical framework to test screened modified gravity theories using strongly lensed gravitational waves, demonstrating that future next-generation detectors can provide stringent constraints on the post-Newtonian parameter $\gamma_{\text{PN}}$ and detect deviations from General Relativity on kpc-Mpc scales by leveraging precise time delay measurements to resolve mass-sheet degeneracy.

Chengsheng Mu, Shuo Cao, Shuxun Tian, Xinyue Jiang, Chenfa Zheng, Dadian ChengWed, 11 Ma🔭 astro-ph

Statistical consistency of sign-switching vacuum energy with cosmological observations

Using exact non-Gaussian consistency diagnostics on CMB, BAO, and supernova data, this study finds that while Gaussian metrics may overstate tensions, both the standard $\Lambda$ CDM and its sign-switching extension $\Lambda_{\rm s}$ CDM show excellent consistency between observations, with the latter offering modest geometric improvements at intermediate redshifts.

Sehjal Khandelwal, Abraão J. S. Capistrano, Suresh KumarWed, 11 Ma🔭 astro-ph

Dynamics of thin accretion disks and accretion around a charged-PFDM black hole

This paper investigates the dynamical behavior of steady spherical accretion and thin accretion disks around a magnetically charged black hole embedded in perfect fluid dark matter, using M87* shadow observations to constrain parameters and revealing that while local radiative flux and temperature are reduced, the overall radiative efficiency and luminosity are enhanced compared to a Schwarzschild black hole.

Taiyang Zhang, Zhongyuan Qin, Qian Feng, Zheng-Wen LongWed, 11 Ma🔭 astro-ph

Maximally Symmetric Boost-Invariant Solutions of the Boltzmann Equation in Foliated Geometries

This paper presents a unified exact solution to the relativistic Boltzmann equation for a boost-invariant conformal gas on $dS_3 \times \mathbb{R}$ across all constant-curvature slicings, which reproduces known Bjorken and Gubser flows while introducing a novel analytic "Grozdanov flow" for hyperbolic foliations that naturally encompasses both hydrodynamic and free-streaming regimes.

Mauricio Martinez, Christopher PlumbergWed, 11 Ma⚛️ hep-ph

Bounds on screened dark energy from near-Earth space-based measurements

This paper utilizes near-Earth space-based measurements, including Gravity Probe B, LAGEOS-2, and prospective Sagnac interferometry with advanced clocks, to establish stringent bounds on chameleon, symmetron, and dilaton screened dark energy models, demonstrating that such experiments can exclude significant portions of their previously allowed parameter space.

Fabiano Feleppa, Welmoed Marit de Graaf, Philippe Brax, Gaetano LambiaseWed, 11 Ma⚛️ hep-ph

Pure Natural Inflation Passes the ACT

This paper demonstrates that pure natural inflation, a top-down single-field model, is compatible with the latest Atacama Cosmology Telescope CMB constraints under both instantaneous and standard reheating scenarios, thereby validating a significant portion of its parameter space and that of its phenomenological extensions.

Cristóbal Zenteno Gatica, Alexandros Papageorgiou, Matteo FasielloWed, 11 Ma⚛️ hep-ph

All-Loop Renormalization and the Phase of the de Sitter Wavefunction

This paper demonstrates that for shift-symmetric scalars in de Sitter space, a quantum anomaly in renormalization forces the late-time wavefunction to acquire an imaginary part that is entirely determined by its renormalization scale dependence to all loop orders, thereby establishing an infinite set of relations among correlators of massless fields and their conjugate momenta.

Alexander Farren, Ciaran McCulloch, Enrico Pajer, Xi TongWed, 11 Ma⚛️ hep-ph

Binary Black Holes population synthesis based on the current LVK observations

This paper analyzes LIGO-Virgo-KAGRA observations from 2015 to early 2024 to demonstrate that the binary black hole population is best explained by a combination of first-generation stellar remnants, hierarchical merger products, and potentially primordial black holes, rather than solely by the collapse of massive stars.

Mehdi El Bouhaddouti, Ilias Cholis, Muhsin AljafWed, 11 Ma⚛️ hep-ph

Field Quantisations in Schwarzschild Spacetime: Theory versus Low-Energy Experiments

This paper demonstrates that the propagator of a Hawking particle in the far-horizon region of Schwarzschild spacetime, derived using quantum field theory in curved spacetime, differs from the result obtained via the path-integral formalism, thereby highlighting a theoretical discrepancy between the standard description of high-energy quantum fields in curved spacetime and the low-energy quantum mechanical phenomena observed in Earth's gravitational field.

Viacheslav A. EmelyanovWed, 11 Ma⚛️ quant-ph

Schwinger's variational principle in Einstein $-$ Cartan gravity

By applying Schwinger's variational principle to the Einstein-Cartan action, the authors derive quantum commutation relations between the metric and torsion tensors.

Nikodem PopławskiWed, 11 Ma⚛️ quant-ph

Can gravity mediate the transmission of quantum information?

This paper proposes an experiment using two isolated optomechanical systems to test the quantum nature of gravity by demonstrating that if a gravitationally induced optical channel can preserve entanglement (a phenomenon termed "gravitationally induced transparency"), then gravity itself must be non-classical, a conclusion reached without assuming a specific quantum gravity model.

Andrea Mari, Stefano Zippilli, David VitaliWed, 11 Ma⚛️ quant-ph

The Spacetime Positive Mass Theorem with Multiple Time Dimensions

This paper generalizes the spacetime positive mass theorem to multiple time dimensions, proving that energy remains nonnegative and bounded by the trace norm of linear momenta, with equality implying a foliation by flat submanifolds and, under an umbilicity assumption, an isometric embedding into a generalized pp-wave.

Sven Hirsch, Alec Payne, Yiyue ZhangTue, 10 Ma🔢 math

← Previous Next →

gr-qc