A5041521211- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Advanced Frequency and Time Standards
- Black Holes and Theoretical Physics
- Geophysics and Sensor Technology
- Noncommutative and Quantum Gravity Theories
- Geophysics and Gravity Measurements
- Scientific Measurement and Uncertainty Evaluation
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Quantum Electrodynamics and Casimir Effect
- Relativity and Gravitational Theory
- Experimental and Theoretical Physics Studies
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Applications
- Advanced Electrical Measurement Techniques
- Radioactive Decay and Measurement Techniques
- Advanced Measurement and Metrology Techniques
- Seismic Waves and Analysis
- Astrophysical Phenomena and Observations
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Semiconductor Lasers and Optical Devices
- Gamma-ray bursts and supernovae
Huazhong University of Science and Technology
2016-2025
University of Chinese Academy of Sciences
2025
Novel (United States)
2024
Physical Measurement Laboratory
2022-2024
University of Surrey
2020
Instituto de Ciencias Agrarias
2020
China University of Geosciences
2018
Beijing University of Posts and Telecommunications
2013
Institute of Theoretical Physics
2001-2010
Hubei University of Education
2007-2010
TianQin is a proposal for space-borne detector of gravitational waves in the millihertz frequencies. The experiment relies on constellation three drag-free spacecraft orbiting Earth. Inter-spacecraft laser interferometry used to monitor distances between test masses. designed be capable detecting signal with high confidence from single source within few months observing time. We describe preliminary mission concept TianQin, including candidate and experimental designs. present estimates...
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...
We report a new test of the gravitational inverse square law at millimeter ranges by using dual-modulation torsion pendulum. An I-shaped symmetric pendulum and attractors were adopted to realize null experimental design. The non-Newtonian force between two macroscopic tungsten plates is measured separations ranging down 0.4 mm, validity design was checked non-null Newtonian gravity measurements. find no deviations from with 95% confidence level, this work establishes most stringent...
We report a test of the universality free fall (UFF) related to spin-gravity coupling effects by comparing gravity acceleration $^{87}$Rb atoms in $m_F=+1$ versus that $m_F=-1$, where corresponding spin orientations are opposite. A Mach-Zehnder-type atom interferometer is exploited sequentially measure these two sublevels, and resultant E$\rm{\ddot{o}}$tv$\rm{\ddot{o}}$s ratio determined this work ${\eta_S} =(-0.2\pm1.5)\times 10^{-5}$. The using or $m_F=-1$ highly sensitive magnetic field...
We improve the test of gravitational inverse-square law at submillimeter range by suppressing vibration electrostatic shielding membrane to reduce disturbance coupled from residual surface potential. The result shows that, a 95% confidence level, holds (|α|≤1) down length scale λ=48 μm. This work establishes strongest bound on magnitude α Yukawa violation in 40-350 μm, and improves previous bounds up factor 3 λ≈70 Furthermore, constraints power-law potentials are improved about 2 for k=4 5.
By using a torsion pendulum and rotating eightfold symmetric attractor with dual modulation of both the interested signal gravitational calibration signal, new test inverse-square law at separations down to $295\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ is presented. A dual-compensation design by adding masses on was adopted realize null experiment. The experimental result shows that, 95% confidence level, holds ($|\ensuremath{\alpha}|\ensuremath{\le}1$) length scale...
Loop quantum gravity, as one branch of holds the potential to explore fundamental nature black holes. Recently, according Oppenheimer-Snyder model in loop cosmology, a novel corrected hole de Sitter spacetime has been discovered. Here, we first investigate corresponding quasinormal modes and late-time behavior massless neutral scalar field perturbations based on such quantum-modified spacetime. The frequency time domain analysis lowest-lying is derived by Prony method, matrix method well...
We present a new value of the Newtonian gravitational constant $G$ by using time-of-swing method. Several improvements greatly reduce uncertainties: (1) measuring anelasticity fiber directly; (2) spherical source masses minimizes effects density inhomogeneity and eccentricities; (3) quartz block pendulum simplifies its vibration modes uncertainty inertial moment; (4) setting both in vacuum chamber reduces error relative positions. By two individual experiments, we obtain $G=6.673\text{...
Short-range experiments testing the gravitational inverse-square law at submillimeter scale offer uniquely sensitive probes of Lorentz invariance. A combined analysis results from short-range gravity HUST-2015, HUST-2011, IU-2012, and IU-2002 permits first independent measurements 14 nonrelativistic coefficients for violation in pure-gravity sector level 10^{-9} m^{2}, improving by an order magnitude sensitivity to numerous types involving quadratic curvature derivatives couplings.
The Newtonian gravitational constant
A new determination of the Newtonian gravitational constant $G$ is presented by using a torsion pendulum with time-of-swing method. Compared our previous measurement same method, several improvements greatly reduced uncertainties as follows: (i) two stainless steel spheres more homogeneous density are used source masses instead cylinders in experiment, and offset mass center from geometric measured found to be much smaller than that cylinders; (ii) rectangular glass block main body pendulum,...
Abstract While general relativity predicts only two tensor modes for gravitational-wave (GW) polarization, metric theories of gravity allow up to four additional modes, including vector and scalar modes. Observing the polarization GWs could provide a direct test modified gravity. The stochastic GW background (SGWB), which can be detected by space-based laser-interferometric detectors at design sensitivity, will an opportunity directly measure alternative polarization. In this paper, we...
Dual-comb ranging allows rapid and precise distance measurement can be universally implemented on different comb platforms, e.g., fiber combs microcombs. To date, dual-fiber-comb has become a mature powerful tool for metrology industry, but the speed is often at kilohertz level due to lower repetition rates. Recently, dual-microcomb given rise new opportunity measurement, in consequence of its small footprint high rates, full-comb stabilization challenging. Here, we report dual-hybrid-comb...
A null experimental test of the Newtonian inverse-square law at submillimeter range using a torsion pendulum was presented. Under dual modulations both expected signal and gravitational torque for calibration, our data concluded with 95% confidence that no new forces were observed any gravitational-strength Yukawa ($|\ensuremath{\alpha}|\ensuremath{\ge}1$) must have length scale $\ensuremath{\lambda}<66\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$, agreeing well latest result E\"ot-wash group....
A search for sidereal variations in the non-Newtonian force between two tungsten plates separated at millimeter ranges sets experimental limits on Lorentz invariance violation involving quadratic couplings of Riemann curvature. We show that finite flat is dominated by edge effects, which includes a suppression effect leading to lower than previous rough estimates. From this search, we determine current best constraints violating coefficients level ${10}^{\ensuremath{-}8}\text{ }\text{...
TianQin is a space-based laser interferometric gravitational wave detector aimed at detecting waves low frequencies (0.1 mHz -- 1 Hz). It formed by three identical drag-free spacecrafts in an equilateral triangular constellation orbiting around the Earth. The distance between each pair of approximately $1.7 \times 10^{5} ~\rm{km}$. are interconnected infrared beams forming up to Michelson-type interferometers. detailed mission design and study science objectives for project depend crucially...
Abstract The Newtonian gravitational constant G , which is one of the earliest fundamental constants introduced by human beings, plays an important role in cosmology, astrophysics, geophysics, metrology, and so on. In spite measurement having a relative longer history more than 200 results been obtained during past years, still remains least precisely known among all physical up to now. Over three decades, many experimental physicists devoted themselves with various methods resulted dozen...
The squeeze-film-damping effect is one of the main limits in many precision experiments, especially study short-range interactions, and its physical mechanism still not very clear. We develop a torsion pendulum to measure damping effects caused by thermal motion residual gas between cubic test mass pair symmetric movable plates. measured results are consistent with model that synthesized elastic inelastic collisions introducing accommodation coefficient (TAC). In our research, pressure...
We have investigated Lorentz violation through analyzing tides-subtracted gravity data measured by superconducting gravimeters. At the level of precision gravimeters, we brought up and resolved an existing issue accuracy due to unaccounted local tidal effects in previous solid-earth model used. Specifically, taken tides into account with a brand new first-principles ocean included, as well removed potential bias from using worldwide array 12 Compared test more accurate competitive bound on...
Precision measurements of the inverse-square law via experiments on short-range gravity provide sensitive tests Lorentz symmetry. A combined analysis data from at Huazhong University Science and Technology Indiana sets simultaneous limits all 22 coefficients for violation correcting Newton force as inverse sixth power distance. Results are consistent with no effect level 10^{-12} m^{4}.
The principal aim of the space-based gravitational wave detectors is to explore waves in 0.1 mHz-1 Hz frequency band. To maximize potential capability experimental apparatus regarding instrument performance, one needs acquire accurate information on its sensitivity limit. curve question, by definition, depends amplitudes signal and noise involved measurement. In this work, we explicitly derive, under rather universal assumptions irrelevant detailed form time-delay interferometry combination,...
We generalize the combinatorial algebraic approach first proposed by Dhurandhar et al. to construct various classes of modified second-generation time-delay interferometry (TDI) solutions. The main idea behind algorithm is enumerate, in a given order, specific type commutator between two monomials defined products particular time-displacement operators. On one hand, above commutators can be systematically rewritten as elements left ideal, l.h.s. relevant equation for TDI solution. other...
With the accumulation of pulsar timing data, evidence stochastic gravitational wave background (SGWB) in nanohertz is becoming more and significant. It gradually possible to study theory gravity with data. Since arrays (PTAs) can observe multiple pulsars at same time, their different spatial correlation patterns caused by SGWB various polarizations make it detect gravitational-wave polarization. In this paper, we investigate alternative NANOGrav 15-year dataset (NG15). First, frequentist...
Gas molecules within the gravitational reference sensor (GRS) subjected to temperature fluctuations can give rise a net disturbance force on test mass (TM), known as radiometer effect, which limits low frequency sensitivity of space-borne wave (GW) detection. Prior research relied infinite-plate model evaluate this supplemented by correction factor account for GRS geometric configuration, whose specific form remains unknown and is accessible solely through experiments or simulations. In...