The Taiji program: A concise overview

Luo, Ziren; Wang, Yan; Wu, Yue; Hu, Wenrui; Jin, Gang

doi:10.1093/ptep/ptaa083

Cited by 120 publications

(72 citation statements)

References 28 publications

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“…In the future, TianQin (Luo et al 2016) and Taiji (Luo et al 2020) could also join the multimessenger observation strategies. The sensitive frequency of Taiji is slightly lower than LISA, which allows the joint observation of Taiji and SKA to detect more PSR-NS systems with a bit larger P b .…”

Section: Scalar-tensor Theorymentioning

confidence: 99%

Stringent Tests of Gravity with Highly Relativistic Binary Pulsars in the Era of LISA and SKA

Miao,

Xu,

Shao

et al. 2021

Preprint

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At present, 19 double neutron star (DNS) systems are detected by radio timing and 2 merging DNS systems are detected by kilo-hertz gravitational waves. Because of selection effects, none of them has an orbital period P b in the range of a few tens of minutes. In this paper we consider a multimessenger strategy proposed by Kyutoku et al. (2019), jointly using the Laser Interferometer Space Antenna (LISA) and the Square Kilometre Array (SKA) to detect and study Galactic pulsar-neutron star (PSR-NS) systems with P b ∼ 10-100 min. We assume that we will detect PSR-NS systems by this strategy. We use standard pulsar timing software to simulate times of arrival of pulse signals from these binary pulsars. We obtain the precision of timing parameters of short-orbitalperiod PSR-NS systems whose orbital period P b ∈ (8, 120) min. We use the simulated uncertainty of the orbital decay, Ṗb , to predict future tests for a variety of alternative theories of gravity. We show quantitatively that highly relativistic PSR-NS systems will significantly improve the constraint on parameters of specific gravity theories in the strong field regime. We also investigate the orbital periastron advance caused by the Lense-Thirring effect in a PSR-NS system with P b = 8 min, and show that the Lense-Thirring effect will be detectable to a good precision.

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Section: Scalar-tensor Theorymentioning

confidence: 99%

Stringent Tests of Gravity with Highly Relativistic Binary Pulsars in the Era of LISA and SKA

Miao,

Xu,

Shao

et al. 2021

Preprint

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“…The noise level of Taiji is 8 pm=Hz 1=2 over an inter-satellite distance of 3 × 10 6 km. The measurement frequency band is about 10 −4 Hz to 1 Hz [18][19][20] . Achieving such high performance of laser interferometry in space is a huge challenge, and the performance of laser interferometry directly determines the sensitivity of space-based GW detection.…”

Section: Introductionmentioning

confidence: 99%

Analysis and suppression of thermal effect of an ultra-stable laser interferometer for space-based gravitational waves detection

Wang

Huang³

et al. 2022

中国光学快报

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In this paper, we present a suppression method for the thermal drift of an ultra-stable laser interferometer. The detailed analysis on the Michelson interferometer indicates that the change in optical path length induced by temperature variation can be effectively reduced by choosing proper thickness and/or incident angle of a compensator. Taking the optical bench of the Laser Interferometer Space Antenna Pathfinder as an example, we analyze the optical bench model with a compensator and show that the temperature coefficient of this laser interferometer can be reduced down to 1 pm/K with an incident angle of 0.267828 rad. The method presented in this paper can be used in the design of ultra-stable laser interferometers, especially for space-based gravitational waves detection.

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“…Missions for micro-Newton thruster applications have become prosperous in recent years, and one of the greatest challenges comes from searching for gravitational waves in space [1,2]. To cancel the non-gravitational effects and compensate for the non-symmetric disturbance on the spacecraft, micro thrusters used for the attitude and orbit control are required to achieve high precision of 0.1 µN resolution and wide dynamic range between 1 µN-50 µN, and low thrust amplitude spectral density (ASD) down to 0.1 µN/Hz 1/2 within 0.1 mHz-1 Hz [3,4]. Accordingly, a more accurate thrust measurement system is in need to measure the variance of the micro-Newton thrusters on the ground, which is hard for the case of an ultra-low thrust-to-weight ratio (TWR) less than 10 −9 .…”

Section: Introductionmentioning

confidence: 99%

Thermal Noise Decoupling of Micro-Newton Thrust Measured in a Torsion Balance

Cong

Liu

et al. 2021

Symmetry

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The space gravitational wave detection and drag free control requires the micro-thruster to have ultra-low thrust noise within 0.1 mHz–0.1 Hz, which brings a great challenge to calibration on the ground because it is impossible to shield any spurious couplings due to the asymmetry of torsion balance. Most thrusters dissipate heat during the test, making the rotation axis tilt and components undergo thermal drift, which is hysteretic and asymmetric for micro-Newton thrust measurement. With reference to LISA’s research and coming up with ideas inspired from proportional-integral-derivative (PID) control and multi-timescale (MTS), this paper proposes to expand the state space of temperature to be applied on the thrust prediction based on fine tree regression (FTR) and to subtract the thermal noise filtered by transfer function fitted with z-domain vector fitting (ZDVF). The results show that thrust variation of diurnal asymmetry in temperature is decoupled from 24 μN/Hz1/2 to 4.9 μN/Hz1/2 at 0.11 mHz. Additionally, 1 μN square wave modulation of electrostatic force is extracted from the ambiguous thermal drift background of positive temperature coefficient (PTC) heater. The PID-FTR validation is performed with experimental data in thermal noise decoupling, which can guide the design of thermal control and be extended to other physical quantities for noise decoupling.

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The Taiji program: A concise overview

Cited by 120 publications

References 28 publications

Stringent Tests of Gravity with Highly Relativistic Binary Pulsars in the Era of LISA and SKA

Stringent Tests of Gravity with Highly Relativistic Binary Pulsars in the Era of LISA and SKA

Analysis and suppression of thermal effect of an ultra-stable laser interferometer for space-based gravitational waves detection

Thermal Noise Decoupling of Micro-Newton Thrust Measured in a Torsion Balance

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