A5042376064- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Radio Astronomy Observations and Technology
- Noncommutative and Quantum Gravity Theories
- High-pressure geophysics and materials
- Geophysics and Sensor Technology
- Seismic Waves and Analysis
- Dark Matter and Cosmic Phenomena
- Relativity and Gravitational Theory
- Stellar, planetary, and galactic studies
- Atomic and Subatomic Physics Research
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Superconducting and THz Device Technology
- Particle physics theoretical and experimental studies
- Particle Accelerators and Free-Electron Lasers
- Cold Atom Physics and Bose-Einstein Condensates
- Computational Physics and Python Applications
- Statistical and numerical algorithms
National Astronomical Observatories
2020-2025
Chinese Academy of Sciences
2020-2025
Peking University
2014-2025
Max Planck Institute for Radio Astronomy
2014-2025
Hebei Normal University
2022-2025
First Affiliated Hospital of Wenzhou Medical University
2025
Kavli Institute for Theoretical Sciences
2018-2024
Southeast University
2023-2024
Shanghai East Hospital
2009-2024
Diamond Light Source
2024
We improve the accuracy of effective-one-body (EOB) waveforms that were employed during first observing run Advanced LIGO for binaries spinning, nonprecessing black holes by calibrating them to a set 141 numerical-relativity (NR) waveforms. The NR simulations expand domain calibration toward larger mass ratios and spins, as compared previous EOBNR model. Merger-ringdown computed in black-hole perturbation theory Kerr spins close extremal provide additional inputs calibration. For...
On a time scale of years to decades, gravitational wave (GW) astronomy will become reality.Low frequency (∼10 -9 Hz) GWs are detectable through long-term timing observations the most stable pulsars.Radio observatories worldwide currently carrying out observing programmes detect GWs, with data sets being shared International Pulsar Timing Array project.One likely sources low supermassive black hole binaries (SMBHBs), as background due large number binaries, or continuous burst emission from...
The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about fundamental theory of nature at play in extreme gravity regime, where gravitational interaction is both strong and dynamical. In this white paper, Fundamental Physics Working Group LISA Consortium summarizes current topics physics observations GWs can be expected provide key input. We briefest reviews then delineate avenues for future research directions discuss connections between working group, other...
We propose a space-based interferometer surveying the gravitational wave (GW) sky in milli-Hz to $\mu$-Hz frequency range. By 2040s', band, bracketed between Laser Interferometer Space Antenna (LISA) and pulsar timing arrays, will constitute largest gap coverage of astrophysically relevant GW spectrum. Yet many outstanding questions related astrophysics cosmology are best answered by observations this band. show that detector be truly overarching observatory for scientific community at...
The gravitational-wave astronomical revolution began in 2015 with LIGO's observation of the coalescence two stellar-mass black holes. Over coming decades, ground-based detectors like laser interferometer observatory (LIGO), Virgo and KAGRA will extend their reach, discovering thousands binaries. In 2030s, space-based space antenna (LISA) enable observations massive holes galactic centres. Between observatories LISA lies unexplored dHz frequency band. Here, we show potential a decihertz (DO)...
The bumblebee gravity model, with a vector field nonminimally coupled to gravity, is natural extension of the Einstein-Maxwell theory. In this theory, black hole can carry hair, making metric deviate from Schwarzschild metric. To investigate detectability we consider an extreme-mass-ratio inspiral (EMRI) system, where stellar-mass inspiraling into supermassive hole. We find that, one-year observation EMRI by space-based gravitational-wave detector, probe charge as small...
The bumblebee gravity model is a vector-tensor theory of gravitation where the vector field nonminimally couples to Ricci tensor. By investigating vacuum equations with spherical symmetry, we find two families black-hole (BH) solutions in this model: one has vanishing radial component and other When coupling between tensor set zero, first family becomes Reissner-Nordstr\"om solution while second degenerates Schwarzschild being zero. General numerical both are obtained for nonzero Besides BH...
A shear-improved Smagorinsky model is introduced based on results concerning mean-shear effects in wall-bounded turbulence. The eddy-viscosity modified as v T =(C s δ) 2 (| S |—|〈 〉|): the magnitude of mean shear |〈 〉|is subtracted from instantaneous resolved rate-of-strain tensor | |; C standard constant and Δ denotes grid spacing. This subgrid-scale tested large-eddy simulations plane-channel flows at Reynolds numbers Re τ = 395 590. First comparisons with dynamic direct numerical for...
Gravitational preferred frame effects are generally predicted by alternative theories that exhibit an isotropic violation of local Lorentz invariance gravity. They described three parameters in the parametrized post-Newtonian formalism. One their strong-field generalizations, , induces a precession pulsar's spin around its movement direction with respect to frame. We constrain using non-detection such characteristics pulse profile. In our analysis we use large number observations from 100 m...
Abstract The Square Kilometre Array (SKA) is a planned large radio interferometer designed to operate over wide range of frequencies, and with an order magnitude greater sensitivity survey speed than any current telescope. SKA will address many important topics in astronomy, ranging from planet formation distant galaxies. However, this work, we consider the perspective as facility for studying physics. We review four areas which expected make major contributions our understanding fundamental...
We present a detailed investigation into the properties of GW170729, gravitational wave with most massive and distant source confirmed to date. employ an extensive set waveform models, including new improved models that incorporate effect higher-order modes which are particularly important for systems. find no indication spin-precession, but inclusion in results estimate mass ratio $(0.3-0.8)$ at 90\% credible level. Our updated measurement excludes equal masses also lead data being more...
The standard model extension is an effective field theory introducing all possible Lorentz-violating (LV) operators to the and general relativity (GR). In pure-gravity sector of minimal extension, nine coefficients describe dominant observable deviations from GR. We systematically implemented 27 tests 13 pulsar systems tightly constrain eight linear combinations these with extensive Monte Carlo simulations. It constitutes first detailed systematic test state-of-the-art observations. No...
We report measurements of the gravitationally lensed secondary image -- first in an infinite series so-called "photon rings" around supermassive black hole M87* via simultaneous modeling and imaging 2017 Event Horizon Telescope (EHT) observations. The inferred ring size remains constant across seven days EHT observing campaign is consistent with theoretical expectations, providing clear evidence that such probe spacetime a striking confirmation models underlying set results. residual diffuse...
We report the results of testing gravitational-wave birefringence using largest population events currently available. Gravitational-wave birefringence, which can arise from effective field theory extension general relativity, occurs when parity symmetry is broken, causing left- and right-handed polarizations to propagate following different equations motion. perform Bayesian inference on 94 reported by 4th-Open Catalog (4-OGC) a parity-violating waveform. find no evidence for violation...
Benefitting from the unequaled precision of pulsar timing technique, binary pulsars are important testbeds gravity theories, providing some tightest bounds on alternative theories gravity. One class well-motivated scalar-tensor gravity, predict large deviations general relativity for neutron stars through a nonperturbative phenomenon known as spontaneous scalarization. This effect, which cannot be tested in Solar System, can now tightly constrained using latest results set 7 (PSRs...
Lorentz violation modifies the dispersion relation of gravitational waves (GWs), and induces birefringence anisotropy in propagation. Our study shows that can also activate multiple polarizations GWs. We use gauge invariants to investigate GWs bumblebee gravity model, obtain following results. (i) For a vector background ${b}^{\ensuremath{\mu}}$ with only nonzero temporal component ${b}^{t}$, there are five independent propagating degrees freedom (d.o.f.), which is similar Einstein-\ae{}ther...
As a vector-tensor theory including nonminimal coupling between the Ricci tensor and vector field, bumblebee gravity is potential to test Lorentz symmetry violation. Recently, new class of numerical spherical black holes in was constructed. In this paper, we investigate associated local thermodynamic properties. By introducing pair conjugated quantities $X$ $Y$, which can be interpreted as an extension electric charge Reissner Nordstr\"om holes, numerically construct first law thermodynamics...
An effective-field theory framework, the Standard Model Extension, is used to investigate existence of Lorentz and $CPT$-violating effects during gravitational wave propagation. We implement a modified equation for dispersion waves that includes isotropic, anisotropic birefringent dispersion. Using LIGO-Virgo-KAGRA algorithm library suite, we perform joint Bayesian inference source parameters coefficients spacetime-symmetry breaking. From sample 45 high-confidence events selected in GWTC-3...
Abstract We report the existence of novel static spherical black hole solutions in a vector–tensor gravitational theory called bumblebee gravity model, which extends Einstein–Maxwell by allowing vector to nonminimally couple Ricci curvature tensor. A test strong-field regime is performed for first time using recent observations supermassive shadows galaxy M87 and Milky Way from Event Horizon Telescope Collaboration. The parameter space found largely unexcluded more experiments are needed...
We derive novel constraints on millicharged dark matter and ultralight axion-like particles using pulsar timing fast radio burst observations. Millicharged affects the dispersion measure of time arrival pulses in a way analogous to free electrons. Light pseudo-scalar matter, other hand, causes polarization angle signals oscillate. show that current future data can set strong both cases. For charge $εe$, these are $ε/{m_{\rm milli}} \lesssim 10^{-8}{\rm eV}^{-1}$, for masses $m_{\rm...
Effective-one-body (EOB) numerical-relativity (NR) waveform models for spin-aligned binary black holes (BBHs), known as the SEOBNR models, are based on EOB theoretical framework and NR simulations. have played an important role in LIGO scientific collaboration (LSC) gravitational wave (GW) data analysis both signal search parameter estimation. quasi-circular orbits evolved through version 1 to 4 by extending their validity domain including more results. Along another direction, we recently...
Pulsar timing and laser-interferometer gravitational-wave observations are two powerful astronomical tools for testing our understanding of gravity. A new analysis demonstrates the complementarity these techniques. As observatories come online in coming years, combining measurements could improve constraints on an illustrative class theories that modify Einstein's general theory relativity.