The exploration of extra dimensions and quantum gravity has long been a frontier of theoretical physics. Recently, Associate Professor Jun Nian and student of the International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) at the University of Chinese Academy of Sciences published a paper in the journal Physical Review D systematically investigating the correction effects of quantum fluctuations near the horizon of near-extremal black branes on the Randall–Sundrum (RS) warped braneworld model. The RS model introduces a warped extra dimension to provide an elegant geometric framework for addressing the hierarchy problem. However, its classical construction does not incorporate quantum gravitational effects or temperature degrees of freedom, which limits its applicability to dynamical processes such as early-universe phase transitions. Over the past decade, Jackiw–Teitelboim (JT) gravity and its boundary Schwarzian mode have proven effective in describing near-horizon quantum fluctuations of near-extremal black holes, offering a natural tool to overcome the above limitation. The present work introduces this technique into the RS model by implanting the Schwarzian mode into the near-horizon geometry of the black brane and deriving the quantum-corrected equations of motion via the Schwinger–Dyson equations, thus achieving a temperature-dependent quantization of the warped compactification background. Within this corrected framework, the team re-calculates the Kaluza–Klein (KK) graviton mass spectrum. They find that the eigenvalues acquire a universal temperature-dependent factor relative to the original classical results. When higher-order corrections are included, the mass corrections for different KK modes show a trend of increasing with the energy level, and the signs of the low-order and higher-order corrections are opposite, suggesting the potential importance of non-perturbative effects. Meanwhile, the study also examines the impact of quantum corrections on the Goldberger–Wise (GW) modulus stabilization mechanism, finding that it is merely equivalent to a renormalization of the GW scalar field mass and does not destabilize the stabilization condition, thereby ensuring the robustness of the RS model’s self-consistency. These results demonstrate that infrared quantum gravitational effects can be incorporated into warped extra-dimensional theories in a controllable manner, and provide new theoretical tools for future studies of brane phase transitions and gravitational wave signals at finite temperature. This work was supported by the International Partnership Program of the Chinese Academy of Sciences (Grant No. 025GJHZ2023106GC) and the National Natural Science Foundation of China (Grants No. 12375067, No. 12147103, and No. 12247103). The research was completed by Ph.D. student Ying-Jian Chen at ICTP AP under the supervision of Associate Professor Jun Nian.Article link:https://doi.org/10.1103/2y2l-cbty
The transport properties of strongly coupled quantum systems constitute an important interdisciplinary problem in high-energy theoretical physics, condensed matter physics, and quantum gravity. Among them, the ratio of the shear viscosity coefficient to the entropy density, η/s, is a core physical quantity for characterizing fluids. Early studies based on gauge/gravity duality found that, in a broad class of strongly coupled quantum field theories with Einstein gravity duals, this ratio takes the universal value η/s= 1/4π, giving rise to the well-known Kovtun–Son–Starinets (KSS) bound conjecture. In recent years, developments in Jackiw–Teitelboim (JT) gravity and AdS2 holography have shown that important quantum fluctuation effects exist in the near-horizon region of near-extremal black branes, enabling systematic investigations of quantum corrections to black brane thermodynamics and related dynamical processes. Recently, a team led by Associate Professor Jun Nian from the International Centre for Theoretical Physics Asia-Pacific at the University of Chinese Academy of Sciences, together with collaborators, published an article in the Journal of High Energy Physics, a leading journal in high-energy theoretical physics. The study systematically investigates how quantum fluctuations in the infrared region of near-extremal black branes modify η/s in strongly coupled systems. Within the framework of gauge/gravity duality, the thermodynamic and transport properties of strongly coupled quantum field theories can be studied through the gravitational dynamics of higher-dimensional black branes or black holes. For systems at finite chemical potential, the near-horizon limit of charged near-extremal black branes develops an AdS2 geometry. In recent years, it has been recognized that this region is not entirely classical: quantum fluctuations described by JT gravity can significantly modify the low-temperature thermodynamics of near-extremal black branes. This naturally raises an important question: can these quantum effects originating from the near-horizon region of black branes also affect the transport coefficients of strongly coupled quantum systems, especially the low-temperature behavior of η/s?This study is centered on this question. We first start from the standard holographic computation of η/s at finite chemical potential and analyze how the stress-tensor correlation functions in the AdS4 boundary field theory are related to the correlation functions in the near-horizon AdS2 region. The study then combines the infrared AdS2 region of near-extremal black branes with quantum fluctuations in JT gravity, computes the quantum-corrected retarded Green’s function, and further extracts the quantum-corrected shear viscosity coefficient through the Kubo formula. In contrast to the classical case, where η/s is fixed at 1/4π, quantum corrections introduce a nontrivial temperature dependence, leading to richer behavior of η/s in the low-temperature regime.The paper focuses on two distinct temperature regimes: the semiclassical regime and the lower-temperature quantum regime, where quantum effects dominate. In the semiclassical regime, the study finds that η/s deviates from the classical universal value as the temperature decreases and reaches a minimum below the KSS bound near a certain critical temperature. This minimum does not arise from nonmonotonic behavior of the shear viscosity coefficient itself, but is instead driven by the nonmonotonic behavior of the quantum-corrected entropy: the quantum-corrected entropy density develops a peak relative to the classical entropy density, thereby producing a minimum in η/s. This result shows that even small quantum corrections can have appreciable effects on the transport properties of strongly coupled systems.In the lower-temperature quantum regime, the authors find that η/s ncreases rapidly and becomes significantly larger than 1/4π. However, the paper also points out that, at extremely low temperatures, the conventional hydrodynamic description and the expression for the quantum-corrected entropy may no longer be reliable, so the interpretation of results in this regime requires particular caution. In particular, when quantum corrections lead to a negative value in the entropy expression, this signals the breakdown of the semiclassical approximation, meaning that the existing formulae cannot be simply extrapolated to strictly zero temperature. Nevertheless, this study provides important clues for understanding how quantum fluctuations of near-extremal black branes affect low-temperature transport.In addition, the authors compare the resulting shear viscosity coefficient with the quantum-corrected absorption cross section of near-extremal black branes. The results show that, in the two temperature regimes studied, the temperature dependence of η is consistent with the quantum-corrected absorption cross section. This mutual consistency supports the self-consistency of the holographic transport calculation and further demonstrates that near-horizon quantum effects of black branes not only modify thermodynamic quantities but also enter dynamical responses and transport processes.This study shows that near-horizon quantum fluctuations can alter the low-temperature transport properties of strongly coupled systems and cause η/s to exhibit temperature-dependent behavior distinct from the classical universal result. These findings not only extend the applications of JT gravity and quantum corrections to near-extremal black branes in holographic transport studies, but also provide new theoretical insights for further understanding quantum effects in black branes, the dynamics of strongly coupled quantum matter, and the question of the η/s bound.This research was supported by the National Natural Science Foundation of China under Grant Nos. 12375067, 12547104, and 12247103. The work was carried out by Xiao-Long Liu, a master’s graduate of the International Centre for Theoretical Physics Asia-Pacific and currently a Ph.D. student at Lehigh University, under the joint supervision of his master’s advisor, Jun Nian, and his Ph.D. advisor, Professor Sera Cremonini of Lehigh University. The collaborator was Professor Li Li from the Institute of Theoretical Physics, Chinese Academy of Sciences. Article link：https://link.springer.com/article/10.1007/JHEP06(2026)193
Replica geometries, as a technique emerged recent years in the study of the black hole information paradox, provide an interpretation of the phase transition of the black hole entropy. Recently, Associate Professor Jun Nian and former postdoctoral researcher Yuan Zhong of the International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) at the University of Chinese Academy of Sciences published a paper in the journal Physical Review D investigating the phase structure induced by the connectivity of replica geometries in the low-dimensional effective theory describing the near-horizon fluctuations of near-extremal Reissner-Nordström black holes. The replica wormhole explanation of black hole entropy phase transitions typically relies on the manual introduction of external entangled systems, such as heat baths or end-of-world branes. This work, by studying the dependence of the entropy of the boundary effective field theory on the coupling constants and the temperature, reveals an intrinsic and rich phase structure of this system. The near-horizon quantum fluctuations of near-extremal RN black holes are described by two-dimensional AdS Jackiw-Teitelboim (JT) gravity coupled to a Maxwell field. This two-dimensional gravity is holographically dual to a one-dimensional field theory described by a Schwarzian mode coupled to a phase mode. The entropy of the one-dimensional field theory system can be computed by the replica trick, which is holographically dual to the replica geometry partition function of the two-dimensional gravity system. By computing the partition functions of the replica geometry in both connected and disconnected configurations, one can determine the phase transition condition. When the entropies contributed by the connected and disconnected geometries cross over each other, a phase transition occurs in the corresponding one-dimensional field theory system. Within this framework, the team computed the dependence of the entropy on the coupling constants and the temperature, and presented the phase structure in the low-temperature limit. This phase structure depends on both the temperature and three coupling constants of the one-dimensional field theory system. The study also examined the effects of quantum corrections of the Schwarzian mode, and found that in different parameter regimes, the phase transition can be either suppressed or shifted. These results provide a new intrinsic perspective on the phase transition behavior in low-dimensional quantum gravity. This work was supported by the National Natural Science Foundation of China (Grants No. 12375067 and No. 12547104). Article link: https://doi.org/10.1103/s5vj-rk9g
The tensions between cosmological parameter measurements from the early-universe and the late-universe datasets offer an exciting opportunity to explore new physics, if not accounted for unknown systematics. Apart from the well-known Hubble tension, a tension up to ∼ 4.9σ in the cosmic dipole has also been reported. While the cosmic dipole is mainly induced by the observer’s kinetic motion, an intrinsic dipole arising from the anisotropy of the universe could also play an import role. Such an intrinsic anisotropy can be a dark energy mimicker that causes the observed accelerating expansion of the universe. As a new and powerful tool, gravitational waves can serve as an independent probe to the cosmic dipole. A useful type of events to achieve this is the “golden dark sirens”, which are near-by well-localized compact binary coalescences whose host galaxies can be identified directly due to precise localization. By forecasting golden dark sirens obtained from 10-year observations using different possible detector networks in the future, we find that the standard LIGO-Virgo-KAGRA detectors are not able to detect a meaningful amount of golden dark sirens, and hence next-generation ground-based detectors are essential to obtain a strong constraint on the cosmic dipole. In particular, we find that a three-detector network consisting of more than one next-generation detectors can yield a constraint on the cosmic dipole at an order of 10−3 when jointly measured with H0. Moreover, a constraint on the cosmic dipole at an order of 10−4 can be achieved when fixing H0.Link:https://doi.org/10.1088/1475-7516/2025/07/076Contact:Anson Chen: chena@ucas.ac.cnInternational Center for Theoretical Physics (Asia-Pacific)
The exploration of extra dimensions and quantum gravity has long been a frontier of theoretical physics. Recently, Associate Professor Jun Nian and student of the International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) at the University of Chinese Academy of Sciences published a paper in the journal Physical Review D systematically investigating the correction effects of quantum fluctuations near the horizon of near-extremal black branes on the Randall–Sundrum (RS) warped braneworld model. The RS model introduces a warped extra dimension to provide an elegant geometric framework for addressing the hierarchy problem. However, its classical construction does not incorporate quantum gravitational effects or temperature degrees of freedom, which limits its applicability to dynamical processes such as early-universe phase transitions. Over the past decade, Jackiw–Teitelboim (JT) gravity and its boundary Schwarzian mode have proven effective in describing near-horizon quantum fluctuations of near-extremal black holes, offering a natural tool to overcome the above limitation. The present work introduces this technique into the RS model by implanting the Schwarzian mode into the near-horizon geometry of the black brane and deriving the quantum-corrected equations of motion via the Schwinger–Dyson equations, thus achieving a temperature-dependent quantization of the warped compactification background.Within this corrected framework, the team re-calculates the Kaluza–Klein (KK) graviton mass spectrum. They find that the eigenvalues acquire a universal temperature-dependent factor relative to the original classical results. When higher-order corrections are included, the mass corrections for different KK modes show a trend of increasing with the energy level, and the signs of the low-order and higher-order corrections are opposite, suggesting the potential importance of non-perturbative effects. Meanwhile, the study also examines the impact of quantum corrections on the Goldberger–Wise (GW) modulus stabilization mechanism, finding that it is merely equivalent to a renormalization of the GW scalar field mass and does not destabilize the stabilization condition, thereby ensuring the robustness of the RS model’s self-consistency. These results demonstrate that infrared quantum gravitational effects can be incorporated into warped extra-dimensional theories in a controllable manner, and provide new theoretical tools for future studies of brane phase transitions and gravitational wave signals at finite temperature.This work was supported by the International Partnership Program of the Chinese Academy of Sciences (Grant No. 025GJHZ2023106GC) and the National Natural Science Foundation of China (Grants No. 12375067, No. 12147103, and No. 12247103). The research was completed by Ph.D. student Ying-Jian Chen at ICTP‑AP under the supervision of Associate Professor Jun Nian.Article link:https://doi.org/10.1103/2y2l-cbty
序号题目作者期刊年份卷期页备注1Chinese gravitational-wave hunt hits crunch timeCYRANOSKI D[J]. Nature2016531(7593): 150-151中国空间引力波探测任务概述2The Taiji Program in Space for gravitational wave physics and the nature of gravityHu W R, Wu Y L[J]. National Science Review20174(5): 685-686任务宏观介绍3A brief analysis to Taiji: Science and technologyLuo Z R, Guo Z K, Jin G, Wu Y L, Hu W R[J]. Results in Physics202016: 102918科学目标简述和关键技术综述4Introduction of Chinese space-borne gravitational wave detection program “Taiji” and “Taiji-1” satellite missionLuo Z R, Zhang M, Jin G, et al.[J]. 深空探测学报 (中英文)20207(1): 3-10太极三步走规划和太极一号进展5 The Taiji program: A concise overviewLuo Z R, Wang Y, Wu Y L, Hu W R, Jin G[J]. Progress of Theoretical and Experimental Physics20212021(5): 05A108路线图、载荷配置和技术分解6Taiji program: Gravitational-wave sourcesRuan W H, Guo Z K, Cai R G, et al.[J]. International Journal of Modern Physics A202035(17): 2050075科学目标7The lisa–taiji networkRuan W H, Liu C, Guo Z K, et al[J]. Nature Astronomy20204(2): 108-109联合观测8Alternative LISA-TAIJI networksWang G, Ni W T, Han W B, et al.[J]. Physical Review D2021104(2): 024012联合编队方案讨论9On networks of space-based gravitational-wave detectorsCai R G, Guo Z K, Hu B, et al[J]. Fundamental Research20232023联合观测科学目标讨论10China's first step towards probing the expanding universe and the nature of gravity using a space borne gravitational wave antennaThe Taiji Scientific Collaboration[J]. Communications Physics2021 4(1): 34太极科学目标及太极一号总体介绍11Taiji program in space for gravitational universe with the first run key technologies test in Taiji-1The Taiji Scientific Collaboration[M]. International Journal of Modern Physics A202136(11/12): 2102002太极一号文集12Taiji Data Challenge for Exploring Gravitational Wave UniverseRen Z, Zhao T, Cao Z, et al[J].Frontiers of Physics202318, 64302太极数据挑战13Review and Scientific Objectives of Spaceborne Gravitational Wave Detection Missions (in Chinese)Wu Y L, Hu W R, et al[J].Chinese Journal of Space Science202343(4): 589-599国家空间科学中长期发展规划-空间天文领域-空间引力波探测14Exploring the nature of black hole and gravity with an imminent merging binary of supermassive black holesZhong X Y, Han W B, Luo Z R, Wu Y L[J].Science China Physics, Mechanics & Astronomy202366(3): 230411设计指标需求分析，科学目标探讨15Space gravitational wave detection: Progress and outlookWei-Tou NISCIENTIA SINICA Physica, Mechanica & Astronomica2024Volume 54, Issue 7, 2024, Pages 270402-空间引力波探测相关技术和科学应用系统专题16Challenges in space-based gravitational wave data analysis and applications of artificial intelligenceWANG He, DU MingHui, XU Peng, ZHOU Yu-FengSCIENTIA SINICA Physica, Mechanica & Astronomica2024Volume 54, Issue 7, 2024, Pages 270403-空间引力波探测相关技术和科学应用系统专题17Inertial sensor for space gravitational wave detection and its key technologiesShaoXin WANG, WeiChuan GUO, PingAn ZHAO, Juan WANG, Peng DONG, Peng XU, ZiRen LUO, KeQi QISCIENTIA SINICA Physica, Mechanica & Astronomica2024Volume 54, Issue 7, 2024, Pages 270404-空间引力波探测相关技术和科学应用系统专题18Advance and prospect in the study of laser interferometry technology for space gravitational wave detectionJuan WANG, KeQi QI, ShaoXin WANG, RuiHong GAO, Pan LI, Ran YANG, HeShan LIU, ZiRen LUOSCIENTIA SINICA Physica, Mechanica & Astronomica2024Volume 54, Issue 7, 2024, Pages 270405-空间引力波探测相关技术和科学应用系统专题19Research progress on torsion pendulum in ground testing of gravitational reference sensor: a reviewHuaDong LI, ZhiYong GAO, Zhi WANGSCIENTIA SINICA Physica, Mechanica & Astronomica2024Volume 54, Issue 7, 2024, Pages 270406-空间引力波探测相关技术和科学应用系统专题20Calibration test method of capacitance sensor for multiple degrees of freedom based on inertial sensorDongXu LIU, ShaoXin WANG, KeQi QI, Peng DONG, WeiChuan GUO, JianJun JIASCIENTIA SINICA Physica, Mechanica & Astronomica2024Volume 54, Issue 7, 2024, Pages 270407-空间引力波探测相关技术和科学应用系统专题21Chiral gravitational wave background in millihertz from axion-like fieldsDING KeYi, FU ChengJie, XU Bao-Yu, ZHANG Yun-LongSCIENTIA SINICA Physica, Mechanica & Astronomica2024Volume 54, Issue 7, 2024, Pages 270408-空间引力波探测相关技术和科学应用系统专题论文下载.rar
Einstein predicted the existence of gravitational waves in 1916, and the LIGO（Laser Interferometer Gravitational Wave Observatory）Collaboration announced the first direct detection of gravitational waves in human history on 11th February,2016 after a century’s exploration, which opens a new window to explore the universe. The detection of gravitational wave signals in the low and mid-frequency bands is needed in order to hear the motions of more massive objects. There are a lots of new gravitational waves sources in this band, which require the construction of space-based gravitational wave observatories. Taiji Program proposed by Chinese scientists is one of the space-based GW detection plans, which is proposed to launch three spacecrafts which will form an equilateral triangle in orbit around the Sun, with 3million kilometers length of each side, composing three sets of Michelson Interferometers.Taiji ProgramTaiji-1, as the technology verification satellite of the Taiji Program, was successfully launched on August 31, 2019, and has completed verification on key technologies, taking the first step towards China’s space-borne gravitational waves detection. The Gravity Reference Sensor (GRS), a main payload of the Taiji-1 satellite, is the endpoint and reference of the laser link of the future space-based gravitational wave detection satellite, to ensure that the test mass moves perfectly along the geodesic line, which is a prerequisite for the detection of gravitational wave signals. The inertial reference of the GRS is determined by the residual acceleration noise of its test mass, which means that the ambient noise need to be suppressed or subtracted.The calibration of the GW detection device’s core payload is a critical step in achieving the space-based GW detection. Recently, the research of calibration of the in-orbit center-of-mass of TaiJi-1 was published in Physical Review D [Phys. Rev. D 108 (2023) 082001]. Xiaotong Wei, a Ph.D. student of the class of 2020 at the International Center for Theoretical Physics-Asia-Pacific (ICTP-AP), is the first author and co-corresponding author of this paper, and his advisor, Prof. Jibo He, is the co-corresponding author as well. After calibration, the acceleration noise level of the gravitational reference sensor readout data in the medium-and-low-frequency band (0.001 to 0.1 Hz) was significantly reduced. The study was favorably reviewed by the referees of Physical Review D:“…Calibration of space-borne instruments is an important foundation for science…In general, the paper and the results are really good…”.This research was supported by the colleagues from the partner institutions of Taiji Alliance and the Strategic Priority Research Program of the Chinese Academy of Sciences (CAS)(XDA15020700, XDA15021100), as well as the Special Funds of the Fundamental Research Funds for Central Universities from the Ministry of Education of the People's Republic of China.Download the paper: https://doi.org/10.1103/PhysRevD.108.082001Center-of-mass calibration before (red dashed line) and after (blue) GRS triaxial readout of acceleration amplitude spectrum density
Various observations from particle physics, astrophysics, and cosmology have suggested that the standard model of particle physics for describing the microscopic structure of matter is not complete. It is then one of the vital scientific problems of current particle physics and cosmological observations to search for the signals of new physics beyond the standard model of particle physics. Many new physics models beyond the standard model of particle physics predict the cosmological first-order phase transitions during the evolution of our Universe. With the temperature decreasing due to the expansion of the Universe, symmetries at high energy scales would be broken simultaneously, and the associated quantum field would decay into the true vacuum from the false vacuum by quantum tunneling via the nucleation and expansion of true-vacuum bubbles, resulting in the energy transfer into the kinetic energy of bubble walls and background fluid, similar to the violent process of frozen ice from supercooling water. The following collisions among expanding bubbles would induce large fluctuations in the energy density. Therefore, as a violent process in the early Universe, the cosmological first-order phase transitions could produce various observational effects, including the stochastic gravitational wave background, primordial magnetic field, and baryon asymmetry, making it feasible to probe or constrain the new physics from astrophysical and cosmological observations. The gravitational-wave observation from cosmological first-order phase transition is also one of the main scientific targets of many gravitational-wave observational projects.Recently, the postdoc Dr. Jing Liu from the International Centre for Theoretical Physics Asia-Pacific of the University of Chinese Academy of Sciences, the associate researcher Prof. Ligong Bian from Chongqing University, the researchers Prof. Rong-Gen Cai, Prof. Zong-Kuan Guo, and the postdoc Dr. Shao-Jiang Wang from the Institute of Theoretical Physics of Chinese Academy of Sciences have proposed a new mechanism for the productions of primordial black holes, and given rise to rigorous constraints on the properties of cosmological first-order phase transitions from the astrophysical observational data. Due to the randomness of quantum tunneling, the progress of vacuum decay varies in different regions. Note that the false vacuum energy density barely changes with the cosmological expansion, while the energy densities of other matter components like radiations and cold dark matter are rapidly diluted with the expansion of the Universe. Therefore, the regions of vacuum decay that fall behind the others would admit higher energy densities after the phase transition. This is to say that the cosmological first-order phase transition would induce fluctuations in energy density. These high-energy-density regions would eventually produce primordial black holes via gravitational collapse, and these primordial black holes are almost monochromatic in their mass spectrum. The relevant paper has been published as a Letter in Phys. Rev.D 105 (2022) L021303. The primordial black holes produced with this mechanism and the associated gravitational waves could explain the merger rate of black hole binaries observed in LIGO-Virgo collaborations as well as the signal from the NANOGrav observation.They also discovered that the first-order phase transition could induce superhorizon curvature perturbations, and in turn probe and constrain the phase-transition properties from the observations of the curvature perturbations at small cosmological scales. The nucleation rate of true vacuum bubbles per unit time and per unit volume could be obtained from the quantum tunneling. After the phase transition, the regions with a scale larger than the product of phase-transition duration and light speed share no causal connection, and the causality requires the energy density spectrum of curvature perturbations to be proportional to the cube of wavenumber. Hence, if the superhorizon scale is considered, the induced curvature perturbations from phase transitions could largely surpass the primordial perturbations from the early-universe inflation so that it can be probed by various astrophysical observations, including the temperature anisotropies and spectrum distortion in the cosmic microwave background radiations and the number density in ultra-compact minihalos. In turn, we could also constrain the phase-transition properties via the upper bounds on the curvature perturbations from these astrophysical observations.Figure 1: Constraints on the parameter space of phase transition from different observations on the curvature perturbations, where alpha denotes the phase-transition strength, beta/H_* denotes the phase-transition rate, and T_* is the phase-transition temperature. The gray solid curves and gray dotted curves in the left and middle panels are constraints from the gravitational-wave background and big bang nucleosynthesis, respectively.They have obtained the power spectrum of the curvature perturbations induced from the first-order phase transitions, and for the first time given rise to rigorous constraints on the phase-transition parameters from the upper bounds on the curvature perturbations from astrophysical observations. The relevant paper has been published in Phys. Rev. Lett 130 (2023) 051001. As shown in Figure 1, all constraints on the cosmological first-order phase transitions below the electroweak scale are obtained from the upper bounds on the curvature perturbations from the big bang nucleosynthesis (blue curves), the temperature anisotropies and spectrum distortion in the cosmic microwave background radiations (green curves), and the number density in ultra-compact minihalos (orange solid curves from pulsar timing array and orange dashed curves from Gamma-ray detections). This study largely enhances the previous constraints from the stochastic gravitational-wave background (gray solid curves) and big bang nucleosynthesis (gray dotted curves) on the QCD first-order phase transition, low-energy dark-sector first-order phase transition, and some of the electroweak first-order phase transition, in particular the low-energy transitions and slow first-order phase transitions.This study is supported by relevant projects from the National Natural Science Foundation of China, the Ministry of Science and Technology of China, and the Chinese Academy of Sciences.Link: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.130.051001Contact:Jing Liu: liujing@ucas.ac.cnInternational Centre for Theoretical Physics Asia-Pacific
International Journal of Modern Physics AVolume 36, Issue 11n12 (30 April 2021)Special Issue on Taiji Program in Space for Gravitational Universe with the First Run Key Technologies Test in Taiji-1 世界科学出版社的《现代物理国际期刊》（International Journal of Modern Physics A）以专辑形式发布了来自180余位研究人员，30余家合作单位的研究成果，以及“太极一号”卫星更为详尽的实验结果。本专辑的论文涵盖了干涉仪系统、引力参考传感器、微推进系统、无拖曳控制、超稳超静卫星技术等，并详细介绍了“太极一号”数据处理流程。S/NTitleAuthorsYear，Volume and Page1The pilot of Taiji program—From the ground to Taiji-2 The Taiji Scientific Collaboration2021,36,11 & 12, 2102001 (6 pages)2Taiji program in space for gravitational universe with the first run key technologies test in Taiji-1 The Taiji Scientific Collaboration2021,36,11 & 12,2102002 (2 pages)3Successful Application of Optical Bench in Taiji-1 Laser InterferometerThe Taiji Scientific Collaboration2021,36,11 & 12,2140001 (15 pages)4Exploration of the coupling between thrust and interference in Taiji-1The Taiji Scientific Collaboration2021,36,11 & 12,2140002 (11 pages)5Preliminary simulation analysis of the temperature fluctuation effect on Taiji-1 laser interferometerXiaoqin Deng,Yu Niu2021,36,11 & 12,2192001 (2 pages)6In-orbit performance of the laser interferometer of Taiji-1 experimental satellite.Heshan Liu, Sha Wei, Ziren Luo*.2021,36,11 & 12,2140004 (8 pages)7The phasemeter of Taiji-1 experimental satelliteZiren Luo, Tao Yu, Heshan Liu.2021,36,11 & 12,2140005 (7 pages)8High stability laser source for Taiji-1 satelliteGuangwei sun, dijun chen, weibiao chen2021,36,11 & 12,2140006 (7 pages)9A spaceborne neodymium-doped yttrium aluminum garnet laser with nonplanar-ring-oscillator configurationJ. Peng, L. Liufeng,and L. Chen2021,36,11 & 12,2140007 (7 pages)10Development and on orbit test of Taiji-1 inertial referenceWang, Z. , and J. G. Lei2021 Vol. 36, No. 11n12, 2140008 11Electronic noise analysis and in-orbit resolution verification of an electrostatic accelerometer Zuo-Lei Wan and Jian Min2021,36,11 & 12,2140009 (9 pages)12Implementation of High-precision Inertial Reference for Taiji-1 Satellite and Its Ground Evaluation Based on Torsion Pendulum SystemHua-Dong Li, Zhi Wang2021,36,11 & 12,, 214001013Performance tests and simulations for Taiji-1 inertial sensor Jian Min, Jun-Gang Lei，et al.2021,36,11 & 12,2140011 (13 pages)14Adaptive preload controller design and analysis for electrostatic suspension systemYukun Wang and Zhi Wang2021,36,11 & 12,2140012 (14 pages)15First result of orbit verification of Taiji-1 hall micro thruster.Xu S Y , Xu L X , Cong L X , Qiao C F.2021,36,11 & 12,2140013 (16 pages)16Ground performance tests and evaluation of RF ion microthrusters for Taiji-1 satelliteJian-Wu He, Li Duan and Qi Kang2021,36,11 & 12,2140014 (11 pages)17A torsional thrust stand for measuring the thrust response time of micro-Newton thrustersChao Yang, Jian-Wu He, Li Duan* and Qi Kang2021,36,11 & 12,2140015 (17 pages)18Ground semi-physical simulation experiment study of one-dimensional drag-free control Chu Zhang,Qi Kang2021,36,11 & 12,2140016 (24 pages)19The impact of neutralizer-free ignition of a radio frequency ion thruster on the lifetime of the ion optics system Long-Fei Ma, Qi Kang2021,36,11 & 12,2140017 (13 pages)20Design of high-resolution flow sensor used in cold gas micro propulsion system Xiaocheng Zhu,Xiaoliang Guo2021,36,11 & 12,2140018 (12 pages)21The drag-free control design and in-orbit experimental results of “Taiji-1”Zhiqiang Hu, Pengcheng Wang, Yueliang Wu, Qi Kang,Yonghe Zhang2021,36,11 & 12,2140019 (16 pages)22Satellite architecture and preliminary in-orbit experiment of Taiji-1Zhiming Cai, Jianfeng Deng, Jinpei Yu, Huawang Li，Xingjian Shi2021,36,11 & 12,2140020 (14 pages)23Key technologies analysis and design of ultra-clean & ultra-stable spacecraft for gravitational wave detectionKun Chen, Xiaofeng Zhang, Tong Guo, Zhi-Ming Cai2021,36,11 & 12,2140021 (11 pages)24Temperature stability of the Taiji-1 satellite in operational orbitXiaofeng Zhang, Hong Liang, Heping Tan, Jinchao Feng, Huawang Li2021,36,11 & 12,2140022 (13 pages)25Testing, modeling and estimation of Taiji-1’s in-orbit magnetic parameters magnetic parametersXingjian Shi* and Zhiming Cai2021,36,11 & 12,2140023 (7 pages)26A temperature measurement system with high resolution and low noiseBing Zhang, Xiaoyi Zhu, Xiaofeng Zhang, Bing Xue, Hong Liang, Jiang Li, Peng Su2021,36,11 & 12,2140024 (10 pages)27The pipeline of data processing for TAIJI-1 space mission in the TAIJI program for the detection of gravitational waveHongbo Jin, Peng Xu2021,36,11 & 12,2140025 (18 pages)28System modeling in data processing of Taiji-1 missionXiaodong Peng, Hongbo Jin, Peng Xu and et. al.2021,36,11 & 12,2140026 (23 pages)29Erratum Preliminary simulation analysis of the temperature fluctuation effect on Taiji-1 laser interferometerXiaoqin Deng,Yu Niu2021,36,11 & 12,2192001 (2 pages)论文下载：https://indico.ictp-ap.org/
2019年 12卷 第3期 “空间引力波探测”专栏聚焦空间引力波探测所需核心关键技术刊登了11篇论文 ，涉及惯性传感器技术、无拖曳控制技术、激光干涉测量技术、绝对距离测量及通信技术、卫星入轨误差分析以及极端质量比旋进系统高精度重校准引力波建模等，为后续引力波探测领域研究提供有益的参考。序号论文题目作者1 太极计划激光指向调控方案介绍高瑞弘,刘河山,罗子人,靳刚2应用于空间精密测量的全玻璃光纤耦合器的系统设计赵亚, 姚东, 王智, 方超, 李钰鹏3Highly accurate recalibrate waveforms for extreme-mass-ratio inspirals in effective-one-body framesCHENG Ran, HAN Wen-biao4电极不对称性对惯性传感器性能损失的研究王少鑫,齐克奇,王玉坤, 王智,陈立恒5无拖曳航天任务检验质量的设计和比较傅江良,甘庆波,张扬,赵柯昕,袁洪6用于引力波关键技术验证的近地低成本商业卫星设计陈琨,蔡志鸣,侍行剑,邓剑峰,余金培,李华旺7空间引力波探测中的绝对距离测量及通信技术刘河山,高瑞弘,罗子人,靳刚8空间引力波探测任务的入轨误差分析李卓,王有亮,郑建华,李明涛9无拖曳控制技术研究及在我国空间引力波探测中的应用邓剑峰,蔡志鸣,陈琨,侍行剑,余金培, 李华旺10星上剩磁对惯性传感器的影响柴国志,黄亮,乔亮,张冠茂11亚微牛级推力测量系统设计及实验研究杨超,贺建武,康琦,段俐论文下载链接：Home · Indico (ictp-ap.org)
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