A5022692145- Pulsars and Gravitational Waves Research
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- Earthquake Detection and Analysis
- Statistical Mechanics and Entropy
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Nonlinear Waves and Solitons
- Complex Systems and Time Series Analysis
- GNSS positioning and interference
- Astronomical Observations and Instrumentation
- Geophysics and Sensor Technology
- Advanced Mathematical Physics Problems
- Statistical and numerical algorithms
- Advanced Frequency and Time Standards
- Atomic and Subatomic Physics Research
- Seismic Waves and Analysis
- Space Technology and Applications
- Stellar, planetary, and galactic studies
Sun Yat-sen University
2020-2025
Henan Normal University
2025
Huazhong University of Science and Technology
2016-2022
TianQin is a planned space-based gravitational wave (GW) observatory consisting of three earth orbiting satellites with an orbital radius about $10^5~{\rm km}$. The will form equilateral triangle constellation the plane which nearly perpendicular to ecliptic plane. aims detect GWs between $10^{-4}~{\rm Hz}$ and $1~{\rm that can be generated by wide variety important astrophysical cosmological sources, including inspiral Galactic ultra-compact binaries, stellar-mass black hole extreme mass...
In this work, we study the prospect of detecting stochastic gravitational-wave background with TianQin Observatory. We consider sources both astrophysical and cosmological origin, including stellar-mass binary black holes, neutron stars, Galactic white dwarves, inflation, first-order phase transitions, cosmic defects. For detector configurations, TianQin, $\mathrm{I}+\text{II}$, $\mathrm{TianQin}+\text{LISA}$. detectability backgrounds cross correlation null channel methods, present...
We explore the prospects of detecting Galactic double white dwarf (DWD) binaries with space-based gravitational wave (GW) observatory TianQin. In this work, we analyze both a sample currently known DWDs and realistic synthetic population to assess number guaranteed detections full capacity mission. find that TianQin can detect 12 out $\sim100$ DWDs; GW signals these be modeled in detail ahead mission launch, therefore they used as verification sources. Besides estimate has potential many...
The capture of compact objects by massive black holes in galaxies or dwarf will generate short gravitational wave signals, called extreme-mass-ratio bursts (EMRBs), before evolving into inspirals. Their detection provide an investigation the hole properties and shed light on astronomy astrophysics. In this work, we investigate number TianQin observatory EMRBs. Our result shows that can detect tens EMRBs events during its mission lifetime. For those detected events, use Fisher information...
Abstract The opening of the gravitational wave window has significantly enhanced our capacity to explore universe's most extreme and dynamic sector. In mHz frequency range, a diverse range compact objects, from massive black holes at farthest reaches Universe lightest white dwarfs in cosmic backyard, generate complex symphony signals. Once recorded by detectors, these unique fingerprints have potential decipher birth growth structures over wide scales, stellar binaries clusters galaxies...
The opening of the gravitational wave window has significantly enhanced our capacity to explore universe's most extreme and dynamic sector. In mHz frequency range, a diverse range compact objects, from massive black holes at farthest reaches Universe lightest white dwarfs in cosmic backyard, generate complex symphony signals. Once recorded by detectors, these unique fingerprints have potential decipher birth growth structures over wide scales, stellar binaries clusters galaxies large-scale...
The method of time-delay interferometry (TDI) is proposed to cancel the laser noise in space-borne gravitational-wave detectors. Among all different TDI combinations, most commonly used ones are orthogonal channels A, E, and T, where A E signal-sensitive T signal-insensitive. Meanwhile, for detection stochastic background, one needs introduce overlap reduction function characterize correlation between channels. For calculation function, it often convenient work low-frequency approximation,...
The detection of stochastic gravitational wave background (SGWB) is among the leading scientific goals space-borne observatory, which would have significant impact on astrophysics and fundamental physics. In this work, we developed a data analysis software, tqsgwb, can extract isotropic SGWB using Bayes method based TianQin detector. We find that for noise cross spectrum, there are imaginary components they play an important role in breaking degeneracy position common laser link. When...
Weak-signal limit is often used in estimating stochastic gravitational-wave background (SGWB) intensities. This approximation fails and the signal-to-noise ratio (SNR) can be much weaker when signals are loud compared to detector noise. In this work, we find that issue especially significant dealing with networks of detectors widely separated. For TianQin + LISA network, SNR estimated under weak-signal might off by as large an order magnitude. Contour plots over parameter spaces also...
Single gravitational-wave detectors face inherent limitations in detecting the anisotropy of stochastic background. In this work, we explore sensitivity to anisotropic backgrounds with a network space-borne detectors. We find that separation between plays an important role determining sensitivity. For first time, observe as large three orders magnitude enhancement detection for multipoles $l=5$ and 6, compared coinciding Coordinating optimizing two can significantly enhance network's...
This paper explores the detection capability of space-borne detectors to anisotropic stochastic gravitational-wave background (SGWB) without relying on low-frequency approximation. To assess performance, we calculate power-law integrated sensitivity (PLIS) curve. Our results demonstrate that a single detector has limited capabilities in detecting multipole moments beyond monopole ($l=0$), quadrupole ($l=2$), and hexadecapole ($l=4$). However, when multiple are combined, presence pointing...
TianQin and LISA are space-based laser interferometer gravitational wave (GW) detectors planned to be launched in the mid-2030s. Both will detect low-frequency GWs around $10^{-2}\,{\rm Hz}$, however, is more sensitive frequencies above this common sweet-spot while below Hz}$. Therefore, able same sources but with different accuracy depending on source its parameters. We consider some of most important astrophysical -- massive black hole binaries, stellar-mass double white dwarfs, extreme...
We derive an ansatz for the five dimensional equal-rotation Kerr-Newman metric that contains two unknown functions. By solving these functions through perturbation series, we find can be cast into Kerr-Shild form in a background is flat at spatial infinity.
Weak-signal limit is often used in estimating stochastic gravitational-wave background (SGWB) intensities. This approximation fails and the signal-to-noise ratio (SNR) can be much weaker when signals are loud compared to detector noise. In this work, we highlight limitation for SGWB detection using space-borne networks. For TianQin + LISA network, SNR estimated under weak-signal might off by as large an order of magnitude. Contour plots over parameter spaces also presented indicate regions...
Space-borne detectors, including TianQin and Laser Interferometry Space Antenna (LISA), are tasked with the simultaneous observation of Galactic foreground, astrophysical cosmological stochastic gravitational-wave backgrounds (SGWBs). For first time, we employ a space-borne detector network to identify multi-component SGWB. Specifically, develop tailored likelihood for cross-correlation detection such networks. Combined likelihood, use simulated datasets + LISA conduct model selection...
In the milli-Hertz frequency band, stochastic gravitational-wave background can be composed of both astronomical and cosmological sources, anisotropic. Numerically depicting these anisotropies critical in revealing underlying properties their origins. For first time, we perform a theoretical analysis constraining ability TianQin on multiple moments background. First, find that with one-year operation, for signal-to-noise ratio 16, recover up to $l=4$. We also identified unique feature sky...
Space-based gravitational wave detectors such as TianQin, LISA, and TaiJi have the potential to outperform themselves through joint observation. To achieve this, it is desirable practice data analysis in advance on simulated that encodes intrinsic correlation among signals found different operate simultaneously. In this paper, we introduce \texttt{GWSpace}, a package can simulate detection from TaiJi. The software not groundbreaking work starts scratch. Rather, use many open-source resources...
The detection of stochastic gravitational wave background (SGWB) is among the leading scientific goals space-borne observatory, which would have significant impact on astrophysics and fundamental physics. In this work, we developed a data analysis software, \texttt{TQSGWB}, can extract isotropic SGWB using Bayes method based TianQin detector. We find that for noise cross spectrum, there are imaginary components they play an important role in breaking degeneracy position common laser link....
The capture of compact objects by massive black holes in galaxies or dwarf will generate short gravitational wave signals, called extreme-mass-ratio bursts (EMRBs), before evolving into inspirals. Their detection provide an investigation the hole properties and shed light on astronomy astrophysics. In this work, we investigate number TianQin observatory EMRBs. Our result shows that can detect tens EMRBs events during its mission lifetime. For those detected events, use Fisher information...
The method of time delay interferometry (TDI) is proposed to cancel the laser noise in space-borne gravitational-wave detectors. Among all different TDI combinations, most commonly used ones are orthogonal channels A, E and T, where A signal-sensitive T signal-insensitive. Meanwhile, for detection stochastic background, one needs introduce overlap reduction function characterize correlation between channels. For calculation function, it often convenient work low-frequency approximation,...