gr-qc papers | Gist.Science

CHRONOS: Cryogenic sub-Hz cROss torsion bar detector with quantum NOn-demolition Speed meter

The paper proposes CHRONOS, a next-generation ground-based gravitational-wave detector utilizing a ring-cavity Sagnac interferometer with torsion-bar test masses and quantum nondemolition speed-meter readout to achieve unprecedented sensitivity in the unexplored 0.1–10 Hz band, thereby enabling the detection of intermediate-mass black hole binaries, probing the stochastic gravitational-wave background, and performing quantum-limited geophysical observations.

Yuki Inoue, Hsiang-Chieh Hsu, Hsiang-Yu Huang, M. Afif Ismail, Vivek Kumar, Miftahul Ma'arif, Avani Patel, Daiki Tanabe, Henry Tsz-King Wong, Ta-Chun YuTue, 10 Ma🔭 astro-ph

Nonlinear Independent Component Analysis Scheme and its application to gravitational wave data analysis

This paper proposes a novel, computationally transparent Independent Component Analysis (ICA) framework capable of estimating and subtracting non-linearly coupled, non-stationary noise from gravitational wave data, as demonstrated through successful applications on both simulated datasets and real KAGRA detector observations.

Jun'ya Kume, Koh Ueno, Tatsuki Washimi, Jun'ichi Yokoyama, Takaaki Yokozawa, Yousuke ItohTue, 10 Ma🔭 astro-ph

Prospective constraints on dark energy from nanohertz individual gravitational wave sources

This study demonstrates that next-generation pulsar timing arrays, by detecting individual nanohertz gravitational waves from supermassive binary black holes and potentially identifying their electromagnetic counterparts, could constrain the dark energy equation-of-state parameter $w$ with a precision of $\Delta w \sim 0.023$ --$0.162$ depending on source hardening timescales and the fraction of detectable counterparts.

Qing Yang, Gu-yue Zhang, Yi Huang, Xiao GuoTue, 10 Ma🔭 astro-ph

Imprints of gravitational-wave polarizations on projected tidal tensor in three dimensions

This paper establishes a theoretical framework demonstrating how extra gravitational-wave polarizations beyond general relativity imprint distinct signatures on the three-dimensional statistical properties of projected galaxy shapes, enabling future large-scale surveys to test modified gravity theories and probe parity violation.

Yusuke Mikura, Teppei Okumura, Misao SasakiTue, 10 Ma🔭 astro-ph

A Deep Learning Framework for Amplitude Generation of Generic EMRIs

This paper introduces a deep learning framework utilizing a convolutional encoder-decoder architecture and transfer learning to rapidly and accurately generate Teukolsky amplitudes for generic Extreme Mass Ratio Inspirals (EMRIs), overcoming the computational limitations of traditional methods for space-borne gravitational wave detection.

Yan-bo Zeng, Jian-dong Zhang, Yi-Ming Hu, Jianwei MeiTue, 10 Ma🔭 astro-ph

Local Origin of Hidden Symmetry in Rotating Spacetimes

This paper demonstrates that the hidden symmetry and separability characteristic of Kerr geometry are inevitable local consequences of the Einstein equations for rotating spacetimes, emerging from a rigid projective alignment enforced by mixed field equations under a minimal local equilibrium condition without requiring vacuum, algebraic speciality, or global boundary assumptions.

Hyeong-Chan KimTue, 10 Ma🔭 astro-ph

Gravitational waves from warm inflation in the weak dissipative regime

This paper extends previous research on gravitational waves from a unified warm inflation and dark sector model to the weak dissipation regime, demonstrating through continuous Bogoliubov coefficient calculations that this scenario significantly enhances the prospects for detection by future gravitational-wave observatories compared to the strong dissipation regime.

Orlando Luongo, Tommaso Mengoni, Paulo M. SáTue, 10 Ma🔭 astro-ph

Shadows and Polarization Images of a Four-dimensional Gauss-Bonnet Black Hole Irradiated by a Thick Accretion Disk

This study utilizes general relativistic ray-tracing to demonstrate that intensity and polarization images of thick accretion disks around four-dimensional Gauss-Bonnet black holes are significantly influenced by the Gauss-Bonnet coupling parameter and disk inclination, offering distinct observational signatures that can probe the intrinsic spacetime structure and near-horizon accretion dynamics.

Xiao-Xiong Zeng, Huan Ye, Muhammad Israr Aslam, Rabia SaleemTue, 10 Ma🔭 astro-ph

Spectral sirens cosmology from binary black holes populations with sharper mass features

By introducing new parametric mass functions with sharper features for binary black holes, this study demonstrates that analyzing the GWTC-4.0 catalog via spectral-sirens inference improves Hubble constant constraints by approximately 50% compared to previous power-law-only models, achieving precision comparable to joint analyses that include neutron stars and galaxy catalogs.

Tom Bertheas, Vasco Gennari, Danièle Steer, Nicola TamaniniTue, 10 Ma🔭 astro-ph

Study of the cosmological tensions and DESI-DR2 in the framework of the Little Rip model

This paper investigates the Little Rip dark energy model as a potential solution to the $H_0$ and $S_8$ cosmological tensions using recent observational data, including DESI-DR2, and finds that while the model reduces the Hubble tension to below $3\sigma $with early-universe data, Bayesian evidence indicates it only provides a statistically improved fit for CMB data compared to the standard$ \Lambda$CDM model.

Safae Dahmani, Imad El Bojaddaini, Amine Bouali, Ahmed Errahmani, Taoufik OualiTue, 10 Ma🔭 astro-ph

A Reproducible Black Hole-Neutron Star Merger Gallery Example for the Einstein Toolkit

This paper presents a fully reproducible black hole-neutron star merger simulation targeting the GW230529 event, performed using the Einstein Toolkit at multiple resolutions and released as a new gallery example to establish a standard reference configuration for future research.

Rahime Matur, Beyhan Karakas, Roland Haas, Ian Hawke, Nils Andersson, Steven R. BrandtTue, 10 Ma🔭 astro-ph

Modified Teukolsky formalism: Null testing and numerical benchmarking

This paper validates a modified Teukolsky framework for predicting gravitational-wave ringdown spectra in effective field theories by successfully passing two rigorous null tests and confirming consistency between two independent numerical methods, thereby establishing its reliability for future strong-field tests of General Relativity.

Fawzi Aly, Mahmoud A. Mansour, Luis Lehner, Dejan Stojkovic, Dongjun Li, Pratik WagleTue, 10 Ma⚛️ hep-ph

Grand Unification Higgs- $\mathcal{R}^2$ Inflation: Complementarity between Proton Decay and CMB Observables

This paper proposes a predictive $SO(10)$ Grand Unified Theory in Palatini gravity where a Higgs field drives inflation and breaks symmetry, linking CMB observables and proton decay lifetimes to offer a testable framework that resolves monopole abundance issues and accommodates current cosmological data.

Nilay Bostan, Rafid H. Dejrah, Anish GhoshalTue, 10 Ma⚛️ hep-ph

Revisiting the Chern-Simons interaction during inflation with a non-canonical pseudo-scalar

This paper proposes a non-canonical pseudo-scalar extension of the Chern-Simons inflation mechanism that, by reducing the field's sound speed, effectively suppresses sourced scalar perturbations to allow for a dominant, nearly totally polarized chiral gravitational wave background without violating non-Gaussianity constraints.

Jun'ya Kume, Marco Peloso, Nicola BartoloTue, 10 Ma⚛️ hep-ph

Black Hole Mergers as the Fastest Photon Ring Scramblers

The paper demonstrates that the final state of a binary black hole merger corresponds with remarkable accuracy to the configuration that maximizes the instability rate of null geodesics, suggesting a deep connection between merger dynamics and the efficiency of photon ring scrambling.

D. Giataganas, G. F. Giudice, A. Ianniccari, A. J. Iovino, A. Kehagias, F. Quevedo, D. Perrone, A. RiottoTue, 10 Ma⚛️ hep-ph

Circular stable orbits in $f(R)$ realistic static and spherically-symmetric spacetimes

This paper numerically investigates geodesic structures in static, spherically symmetric neutron star spacetimes within the quadratic Starobinsky $f(R)$ gravity model, revealing that stable circular orbits for massive particles exist in discrete radial bands sensitive to stellar properties and the model parameter, while no photon spheres are found outside the star.

Néstor Rivero González, Álvaro de la Cruz Dombriz, Gonzalo J. OlmoTue, 10 Ma⚛️ hep-ph

Gravitational waves in metric-affine bumblebee gravity

This paper investigates gravitational wave propagation and emission in metric-affine bumblebee gravity, deriving modified dispersion relations and radiation patterns that depend on the orientation of the Lorentz-violating background vector, and uses multimessenger observations of GW170817 to constrain the theory's parameters.

A. A. Araújo FilhoTue, 10 Ma⚛️ hep-ph

Fundamental Limits of Quantum Sensors for Gravitational Wave Detection

This paper demonstrates that while advanced quantum sensors cannot directly detect gravitational waves via internal atomic or center-of-mass coupling due to negligible signal gains, they can still enhance existing laser and atom interferometers by factors of 1.04 to 2.4 by exploiting the light-propagation coupling mechanism and addressing specific noise limitations.

Sergio GaudioTue, 10 Ma🔬 physics.atom-ph

Emergent fracton strings from covariant bi-form gauge field theory

This paper introduces a covariant rank-4 tensor gauge field theory that naturally generates fractonic string excitations and a novel generalized dipole conservation law through symmetry principles, while also revealing a deep connection to linearized area-metric gravity.

Erica Bertolini, Hyungrok Kim, Giandomenico PalumboTue, 10 Ma🔬 cond-mat.mes-hall

Torsion-Induced Quantum Fluctuations in Metric-Affine Gravity using the Stochastic Variational Method

This review paper demonstrates that spatial torsion in Metric-Affine Gravity induces non-linear quantum fluctuations affecting spinless degrees of freedom through the Stochastic Variational Method, revealing a competitive interplay with Levi-Civita curvature and a structural parallelism with information geometry.

Tomoi Koide, Armin van de VennTue, 10 Ma⚛️ quant-ph

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