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gr-qc2026

Testing General Relativity with Binary Lens Microlensing Events

Xinyang Jin, Shuo Cao, Xuanni Chen +3

Einstein's General Relativity (GR), which has been precisely tested on galaxy and solar system scales, is still poorly constrained in extremely weak gravitational fields (with dime…

gr-qc2026

Null test of general relativity based on gravitational waves

Dawen Chen, Zeyuan Kang, Zhoujian Cao

Several hundreds of gravitational wave events have been detected. They are good tools to investigate various fundamental problems, including tests of general relativity (GR) theory…

gr-qc2026

Gravitational caloric theory: From early dark energy to a wide variety of gravitational phenomena

S. X. Tian

We propose gravitational caloric theory (GCT) --- an extension of general relativity that features a vector field sourced by and non-minimally coupled to the fluid sector whi…

gr-qc2026

Degenerate Limits of Scalar-Tensor Gravity

Bekir Baytaş, Xiao-Kan Guo

We study the degenerate limits of the scalar-tensor theory of gravity in its Hamiltonian connection dynamics formulation. The degenerate limit of the spatial triad is effectuated b…

gr-qc2026

Solving Hamiltonian Constraint Equation with Physics-Informed Neural Networks

Yu-Chen Zhou, Hao Ma, Zhoujian Cao +6

Numerical relativity (NR), solving Einstein equation numerically, plays an important role in source modelling for gravitational wave astronomy. Traditional methods for NR including…

gr-qc2026

Tidal Love numbers and the dynamical instability of AdS bubbles

Gerui Chen, Yu Tian, Hongbao Zhang

In this work, we study non-radial perturbations of AdS bubbles and their tidal Love numbers (TLNs). The odd- and even-parity TLNs are computed up to in the limit $k \to \inft…

gr-qc2026

Constraining Kerr supermassive black hole properties using gravitational waves from inspiraling stellar-mass binary black holes

Jie Wu, Jin-Tao Yao, Mengfei Sun +2

We study the capability of future space-based gravitational-wave (GW) detectors to constrain supermassive black hole (SMBH) properties through observations of inspiraling stellar-m…

gr-qc2026★ 2 cited

GW240925 and GW250207: Astrophysical Calibration of Gravitational-wave Detectors

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1839

GW240925 and GW250207 are two loud gravitational-wave signals from binary black hole coalescences observed with network signal-to-noise ratios and , respectively…

gr-qc2026★ 1 cited

Searches for Continuous Gravitational Waves from Supernova Remnants in the first part of the LIGO-Virgo-KAGRA Fourth Observing run

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1764

We present results from directed searches for continuous gravitational waves from a sample of 15 nearby supernova remnants, likely hosting young neutron star candidates, using data…

gr-qc2026

Cosmic anisotropic hair of nonlocal RT gravity

Jiajun Zhou, Shuxun Tian, Zong-Hong Zhu

Nonlocal RT gravity has proven effective in explaining the late-time cosmic acceleration while remaining consistent with local gravity tests. However, most previous cosmological st…

gr-qc2026

High Sensitivity Methodologies to Detect Radio Band Gravitational Waves

Wei Hong, Peng He, Tong-Jie Zhang +2

Gravitational waves (GWs) can resonate with magnetic fields through the Gertsenshtein-Zeldovich effect, producing electromagnetic signals at the same frequency. In pulsar magnetosp…

gr-qc2026

Narrowband searches for continuous gravitational waves from known pulsars in the first two parts of the fourth LIGO--Virgo--KAGRA observing run

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1853

Rotating non-axisymmetric neutron stars (NSs) are promising sources for continuous gravitational waves (CWs). Such CWs can, if detected, inform us about the internal structure and…

gr-qc2026★ 2 cited

Expansion operators in spherically symmetric loop quantum gravity

Xiaotian Fei, Gaoping Long, Yongge Ma +1

The ingoing and outgoing null expansions associated to a spatial 2-sphere are quantized in the spherically symmetric model of loop quantum gravity. It is shown that the resulting e…

gr-qc2026★ 1 cited

Constraints on gravitational waves from the 2024 Vela pulsar glitch

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1774

Among known neutron stars, the Vela pulsar is one of the best targets for gravitational-wave searches. It is also one of the most prolific in terms of glitches, sudden frequency ch…

gr-qc2026

Nonlinear tails of massive scalar fields around a black hole

Caiying Shao, Zhen-Tao He, Jiageng Jiao +5

Nonlinear effects play a fundamental role in the late-time ringdown of black holes, with direct implications for gravitational-wave observations. For massive fields, these dynamics…

gr-qc2026

Constraining Lorentz and parity violations in gravity with multiband gravitational wave observations

Zhi-Xin Jia, Tao Zhu, Zhoujian Cao

This study evaluates the capability of future multi-band observations of gravitational waves emitted from binary black hole coalescences, utilizing joint third-generation ground-ba…