121 citations · 737 across the 21 of their papers we have counts for
21 papers
Moment of Inertia for Axisymmetric Neutron Stars in the Standard-Model Extension
Yiming Dong, Zexin Hu, Rui Xu +1
We develop a consistent approach to calculate the moment of inertia (MOI) for axisymmetric neutron stars (NSs) in the Lorentz-violating Standard-Model Extension (SME) framework. To…
Classical radiation fields for scalar, electromagnetic, and gravitational waves with spacetime-symmetry breaking
Quentin G. Bailey, Alexander S. Gard, Nils A. Nilsson +2
An effective field theory framework is used to investigate some Lorentz-violating effects on the generation of electromagnetic and gravitational waves, complementing previous work…
Extended thermodynamics of the bumblebee black holes
Zhan-Feng Mai, Rui Xu, Dicong Liang +1
As a vector-tensor theory including nonminimal coupling between the Ricci tensor and a vector field, the bumblebee gravity is a potential theory to test Lorentz symmetry violation.…
Bumblebee black holes in light of Event Horizon Telescope observations
Rui Xu, Dicong Liang, Lijing Shao
We report the existence of novel static spherical black-hole solutions in a vector-tensor gravitational theory called the bumblebee gravity model which extends the Einstein-Maxwell…
A Four-Parameter Black-Hole Solution in the Bumblebee Gravity Model
Rui Xu
The bumblebee gravity model includes a class of vector-tensor theories of gravitation where the vector field couples to the Ricci tensor quadratically. We obtain an analytical sphe…
Probing vector hair of black holes with extreme mass ratio inspirals
Dicong Liang, Rui Xu, Zhan-Feng Mai +1
The bumblebee gravity model, with a vector field nonminimally coupled to gravity, is a natural extension of the Einstein-Maxwell theory. In this theory, a black hole can carry a ve…
Static spherical vacuum solutions in the bumblebee gravity model
Rui Xu, Dicong Liang, Lijing Shao
The bumblebee gravity model is a vector-tensor theory of gravitation where the vector field nonminimally couples to the Ricci tensor. By investigating the vacuum field equations wi…
Polarizations of Gravitational Waves in the Bumblebee Gravity Model
Dicong Liang, Rui Xu, Xuchen Lu +1
Lorentz violation modifies the dispersion relation of gravitational waves (GWs), and induces birefringence and anisotropy in propagation. Our study shows that Lorentz violation can…
Oscillation Modes and Gravitational Waves from Strangeon Stars
Hong-Bo Li, Yong Gao, Lijing Shao +2
The strong interaction at low energy scales determines the equation of state (EOS) of supranuclear matters in neutron stars (NSs). It is conjectured that the bulk dense matter may…
Neutron stars in massive scalar-Gauss-Bonnet gravity: Spherical structure and time-independent perturbations
Rui Xu, Yong Gao, Lijing Shao
The class of scalar-tensor theories with the scalar field coupling to the Gauss-Bonnet invariant has drawn great interest since solutions of spontaneous scalarization were found fo…
Scalarized neutron stars in massive scalar-tensor gravity: X-ray pulsars and tidal deformability
Zexin Hu, Yong Gao, Rui Xu +1
Neutron stars (NSs) in scalar-tensor theories of gravitation with the phenomenon of spontaneous scalarization can develop significant deviations from general relativity. Cases with…
Signature of Lorentz Violation in Continuous Gravitational-Wave Spectra of Ellipsoidal Neutron Stars
Rui Xu, Yong Gao, Lijing Shao
We study effects of Lorentz-invariance violation on the rotation of neutron stars (NSs) in the minimal gravitational Standard-Model Extension framework, and calculate the quadrupol…
Precession of spheroids under Lorentz violation and observational consequences for neutron stars
Rui Xu, Yong Gao, Lijing Shao
The Standard-Model Extension (SME) is an effective-field-theoretic framework that catalogs all Lorentz-violating field operators. The anisotropic correction from the minimal gravit…
Triaxially-deformed Freely-precessing Neutron Stars: Continuous electromagnetic and gravitational radiation
Yong Gao, Lijing Shao, Rui Xu +3
The shape of a neutron star (NS) is closely linked to its internal structure and the equation of state of supranuclear matters. A rapidly rotating, asymmetric NS in the Milky Way u…
Strong-field effects in massive scalar-tensor gravity for slowly spinning neutron stars and application to X-ray pulsar pulse profiles
Rui Xu, Yong Gao, Lijing Shao
Neutron stars (NSs) in scalar-tensor (ST) theories of gravitation can acquire scalar charges and generate distinct spacetimes from those in General Relativity (GR) through the cele…
Modifications to Plane Gravitational Waves from Minimal Lorentz Violation
Rui Xu
General Relativity predicts two modes for plane gravitational waves. When a tiny violation of Lorentz invariance occurs, the two gravitational wave modes are modified. We use pertu…
Neutron Star Structure in the Minimal Gravitational Standard-Model Extension and the Implication to Continuous Gravitational Waves
Rui Xu, Junjie Zhao, Lijing Shao
Tiny violation of Lorentz invariance has been the subject of theoretic study and experimental test for a long time. We use the Standard-Model Extension (SME) framework to investiga…
Constraining Spacetime Nonmetricity with Neutron Spin Rotation in Liquid He-4
Ralf Lehnert, W. M. Snow, Zhi Xiao +1
General spacetime nonmetricity coupled to neutrons is studied. In this context, it is shown that certain nonmetricity components can generate a rotation of the neutron's spin. Avai…
Constraints on Nonmetricity from Bounds on Lorentz Violation
Joshua Foster, Alan Kostelecky, Rui Xu
Spacetime nonmetricity can be studied experimentally through its couplings to fermions and photons. We use recent high-precision searches for Lorentz violation to deduce first cons…
Looking for Lorentz Violation in Short-Range Gravity
Rui Xu
General violations of Lorentz symmetry can be described by the Standard-Model Extension (SME) framework. The SME predicts modifications to existing physics and can be tested in hig…
Short-range gravity and Lorentz violation
Quentin G. Bailey, Alan Kostelecky, Rui Xu
Comparatively few searches have been performed for violations of local Lorentz invariance in the pure-gravity sector. We show that tests of short-range gravity are sensitive to a b…