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Synergy between CSST galaxy survey and gravitational-wave observation: Inferring the Hubble constant from dark standard sirens

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 7-19页

作者： Ji-Yu Song Ling-Feng Wang Yichao Li Ze-Wei Zhao Jing-Fei Zhang Wen Zhao Xin Zhang Key laboratory of Cosmology and Astrophysics(Liaoning)&College of Sciences Northeastern UniversityShenyang 110819China CAS Key laboratory for researches in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaChinese Academy of SciencesHefei 230026China School of Astronomy and space Sciences University of Science and Technology of ChinaHefei 230026China National Frontiers Science Center for Industrial Intelligence and Systems Optimization Northeastern UniversityShenyang 110819China Key laboratory of Data Analytics and Optimization for Smart Industry(Ministry of Education) Northeastern Universty Shenyang 110819China

Gravitational waves(GWs) from compact binary coalescences encode the absolute luminosity distances of GW sources. Once the redshifts of GW sources are known, one can use the distance-redshift relation to constrain cosmological parameters. One way to obtain the redshifts is to localize GW sources by GW observations and then use galaxy catalogs to determine redshifts from a statistical analysis of redshift information of the potential host galaxies, commonly referred to as the dark siren method. The third-generation(3G) GW detectors are planned to work in the 2030s and will observe numerous compact binary *** these GW events as dark sirens requires high-quality galaxy catalogs from future sky survey projects. The China space Station Telescope(CSST) will be launched in 2024 and will observe billions of galaxies within a 17500 deg^(2) survey area with redshift up to z ~ 4, providing photometric and spectroscopic galaxy catalogs. In this work, we simulate the CSST galaxy catalogs and the 5-year GW data from the 3G GW detectors and combine them to infer the Hubble constant(H_(0)). Our results show that the measurement precision of H0could reach the sub-percent level, meeting the standard of precision cosmology. We conclude that the synergy between CSST and the 3G GW detectors is of great significance in measuring the Hubble constant.

关键词： CSST galaxy survey galaxy catalogs gravitational waves dark sirens the Hubble constant

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The cosmological significance of the Taiji-TianQin-LISA network

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 190-190页

作者： Wen Zhao CAS Key laboratory for researches in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China School of Astronomy and space Science University of Science and Technology of ChinaHefei 230026China

Gravitational waves(GWs)can provide important new probes for exploring the evolution of the *** significant advantage of GWs is their ability to measure absolute distances on cosmological scales,rather than relative distances,which is crucial for cosmological research,especially in determining the Hubble *** to the“standard candles”and“standard ruler”in cosmology,distance measurements based on GWs are referred to as“standard sirens”.

关键词： scales evolution network

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Primordial black hole mass functions as a probe of cosmic origin

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 164-171页

作者： Yi-Fu Cai Chengfeng Tang Geyu Mo Sheng-Feng Yan Chao Chen Xiao-Han Ma Bo Wang Wentao Luo Damien A.Easson Antonino Marcianò Deep space Exploration laboratory/School of Physical Sciences University of Science and Technology of ChinaHefei 230026China CAS Key laboratory for researches in Galaxies and Cosmology/Department of Astronomy School of Astronomy and Space ScienceUniversity of Science and Technology of ChinaHefei 230026China Istituto Nazionale di Fisica Nucleare(INFN) Sezione di MilanoMilano 20146Italy DiSAT Universitàdegli Studi dell'InsubriaComo 22100Italy Jockey Club Institute for Advanced Study The Hong Kong University of Science and TechnologyHong KongChina Department of Physics Arizona State UniversityTempe 85287-1504USA Department of Physics&Center for Field Theory and Particle Physics Fudan UniversityShanghai 200433China Laboratori Nazionali di Frascati INFN Via Enrico Fermi 541 Frascati(Roma)00044Italy INFN sezione Roma Tor Vergata Rome I-00133Italy School of Physics University of Electronic Science and Technology of ChinaChengdu11731China

We discuss a novel window to probe the origin of our universe via the mass functions of primordial black holes(PBHs).The mass functions of PBHs are simply estimated using the conventional Press-Schechter formalism for two paradigms of cosmic origin,including inflationaryΛCDM and bounce *** standard inflationaryΛCDM model cannot generate an appreciable number of massive PBHs;however,non-trivial inflation models with blue-tilted power spectra at small scales and matter bounce cosmology provide formation mechanisms for heavy PBHs,which in turn,may seed the observed supermassive black holes(SMBHs).By fitting the SMBH mass functions at high redshift(z~6)derived from Sloan Digital Sky Survey(SDSS)and Canada-France High-z Quasar Survey(CFHQS)quasars,for two paradigms of cosmic origin,we derive constraints on the PBH density fraction fPBHat z~6 and the characteristic mass M_(★),with the prior assumption that all SMBHs stem from *** demonstrate that this newly proposed procedure,relying on astronomical measurements that utilize deep-field surveys of SMBHs at high redshift,can be used to constrain models of cosmic ***,although not the main focus of this paper,we evolve the mass function from z~6 to z~0 through an assumption of 3×10^(8)-year Eddington’s accretion,and give a rough estimation of fPBHat z~0.

关键词： origin cosmic massive

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Quintom cosmology and modified gravity after DESI 2024

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Science Bulletin 2024年第17期69卷 2698-2704页

作者： Yuhang Yang Xin Ren Qingqing Wang Zhiyu Lu Dongdong Zhang Yi-Fu Cai Emmanuel N.Saridakis Department of Astronomy School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026China CAS Key laboratory for researches in Galaxies and Cosmology School of Astronomy and Space ScienceUniversity of Science and Technology of ChinaHefei 230026China Deep space Exploration laboratory Hefei 230088China Department of Physics Tokyo Institute of TechnologyTokyo 152-8551Japan Kavli IPMU(WPI) UTIASThe University of TokyoChiba 277-8583Japan National Observatory of Athens Lofos Nymfon 11852Greece Departamento de Matemáticas Universidad Católica del NorteAntofagasta 1270398Chile

We reconstruct the cosmological background evolution under the scenario of dynamical dark energy through the Gaussian process approach,using the latest Dark Energy Spectroscopic Instrument(DESI)baryon acoustic oscillations(BAO)combined with other *** results reveal that the reconstructed dark-energy equation-of-state(EoS)parameter w(z)exhibits the so-called quintom-B behavior,crossing-1 from phantom to quintessence regime as the universe *** investigate under what situation this type of evolution could be achieved from the perspectives of field theories and modified *** particular,we reconstruct the corresponding actions for f(R),f(T),and f(Q)gravity,*** explicitly show that,certain modified gravity can exhibit the quintom dynamics and fit the recent DESI data efficiently,and for all cases the quadratic deviation from theΛCDM scenario is mildly favored.

关键词： DESI Dark energy Quintom cosmology Modified gravity

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Review on thermal management technologies for electronics in spacecraft environment

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Energy Storage and Saving 2024年第3期3卷 153-189页

作者： Yi-Gao Lv Yao-Ting Wang Tong Meng Qiu-Wang Wang Wen-Xiao Chu Key laboratory of Thermo-fluid Science and Engineering Ministry of EducationXi’an Jiaotong UniversityXi’an710049China Xi’an Institute of space Radio Technology Xi’an710100China

Due to the rapid development of the space industry,ever higher demands are being made for the optimization and improvement of spacecraft thermal management *** control technology has become one of the key bottlenecks that restrict the level of spacecraft *** this paper,the thermal management technologies(TMTs)for spacecraft electronics are reviewed according to the different heat transfer processes,including heat acquisition,heat transport,and heat *** researches on efficient heat acquisition include the utilization of high thermal conductance materials,the development of novel package structure based on micro-/nanoelectromechanical system(MEMS/NEMS)technologies,and advanced near-junction microfluidic cooling *** the heat transport process,various heat pipes and mechanical pumped fluid loops(MPFLs)are widely implemented to transport heat from heat generation components to the ultimate heat *** heat pipes are divided into two categories based on their structure layout,i.e.,separated heat pipes and unseparated heat *** merits and demerits of these heat pipes and MPFLs(including the single-phase MPFL and the two-phase MPFL)are discussed and summarized *** terms of the heat rejection for spacecraft,thermal radiators are normally the sole option due to the unique space *** meet the requirements of large heat dissipation power and fluctuated thermal environment,research efforts on the radiators mainly focus on the development of deployable radiators,variable emissivity radiators,and the combination with other *** to the fluctuated characteristics of the heat power of internal electronics and the outer thermal environment,the phase change materials(PCMs)exhibit great advantages in this scenario and have attracted a lot of research *** review aims to serve as a reference guide for the development of thermal management system in the future spacecraft.

关键词： Thermal management Electronics spacecraft Heat pipe Mechanically pumped fluid loop Radiator Phase change material

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Adiabatic regularization and Green's function of a scalar field in de Sitter space: Positive energy spectrum and no trace anomaly

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Science China(Physics,Mechanics & Astronomy) 2020年第5期63卷 59-91页

作者： Yang Zhang Xuan Ye Bo Wang Department of Astronomy Key Laboratory for Researches in Galaxies and CosmologySchool of Astronomy and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China

In the conventional adiabatic regularization the vacuum ultraviolet divergences of a quantum field in curved spacetime are removed by subtracting the k-mode of the stress tensor to the 4 *** a scalar field in de Sitter space,we find that the4 th-order regularized spectral energy density is ***,the 2 nd-order regularization for minimal coupling(ξ=0)and the 0 th-order regularization for conformal coupling(ξ=1/6) yield a positive and UV-convergent spectral energy density and power *** regularized stress tensor in the vacuum is maximally symmetric and can drive inflation,while its k-modes representing the primordial fluctuations are nonuniformly *** regularization of a Green's function in position space is generally plagued by a log IR *** in the massless case with ξ=0 or 1/6,we can directly regularize the Green's functions and obtain vanishing results that agree with the adiabatic regularization *** this case,the regularized power spectrum and stress tensor are both zero,and no trace anomaly *** overcome the log IR divergence problem in the massive cases with ξ=0 and 1/6,we perform Fourier transformation of the regularized power spectra and obtain the regularized analytical Green's functions which are IR-and UV-convergent.

关键词： inflationary universe mathematical and relativistic aspects of cosmology quantum fields in curved spacetimes

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A massless scalar field in Robertson-Walker spacetimes:Adiabatic regularization and Green’s function

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Chinese Physics C 2020年第9期44卷 194-209页

作者： Yang Zhang Bo Wang Xuan Ye Department of Astronomy CAS Key Laboratory for Researches in Galaxies and CosmologySchool of Astronomy and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China

We study adiabatic regularization of a coupling massless scalar field in general spatially flat Robertson-Walker(RW)*** the conformal coupling,the 2nd-order regularized power spectrum and 4th-order regularized stress tensor are zero,and no trace anomaly exists in general RW *** is a new result that exceeds those found in de Sitter *** the minimal coupling,the regularized spectra are also zero in the radiationdominant and matter-dominant stages,as well as in de Sitter *** vanishing of these adiabatically regularized spectra is further confirmed by direct regularization of the Green's *** a general coupling and general RW spacetimes,the regularized spectra can be negative under the conventional *** a higher order of regularization,the spectra will generally become positive,but will also acquire IR divergence,which is inevitable for a massless *** avoid the IR divergence,the inside-horizon regularization is *** these procedures,nonnegative UV-and IR-convergent power spectrum and spectral energy density will eventually be achieved.

关键词： quantum fields in curved spacetimes inflationary universe mathematical and relativistic aspects of cosmology

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Estimation of spectrum and parameters of relic gravitational waves using space-borne interferometers

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Research in Astronomy and Astrophysics 2019年第2期19卷 77-110页

作者： Bo Wang Yang Zhang Key laboratory for researches in Galaxies and Cosmology Department of Astronomy University of Science and Technology of China

We present a study of spectrum estimation of relic gravitational waves(RGWs) as a Gaussian stochastic background from output signals of future space-borne interferometers, like LISA and *** the target of detection, the analytical spectrum of RGWs generated during inflation is described by three parameters: the tensor-scalar ratio, the spectral index and the running index. The Michelson interferometer is shown to have a better sensitivity than Sagnac and symmetrized Sagnac. For RGW detection, we analyze the auto-correlated signals for a single interferometer, and the cross-correlated, integrated as well as unintegrated signals for a pair of interferometers, and give the signal-to-noise ratio(SNR) for RGW, and obtain lower limits of the RGW parameters that can be detected. By suppressing noise level, a pair has a sensitivity2 orders better than a single for one year observation. SNR of LISA will be 4–5 orders higher than that of Advanced LIGO for the default RGW. To estimate the spectrum, we adopt the maximum likelihood(ML)estimation, calculate the mean and covariance of signals, obtain the Gaussian probability density function(PDF) and the likelihood function, and derive expressions for the Fisher matrix and the equation of the ML estimate for the spectrum. The Newton-Raphson method is used to solve the equation by iteration. When the noise is dominantly large, a single LISA is not effective for estimating the RGW spectrum as the actual noise in signals is not known accurately. For cross-correlating a pair, the spectrum cannot be estimated from the integrated output signals either, and only one parameter can be estimated with the other two being either fixed or marginalized. We use the ensemble averaging method to estimate the RGW spectrum from the un-integrated output signals. We also adopt a correlation of un-integrated signals to estimate the spectrum and three parameters of RGW in a Bayesian approach. For all three methods, we provide simulations to illustr

关键词： gravitational waves cosmological parameters instrumentation:detectors early universe

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A photometric study of two neglected eclipsing binaries

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Research in Astronomy and Astrophysics 2021年第7期21卷 192-198页

作者： V.Kudak M.Fedurco V.Perig S.Parimucha laboratory of space researches Uzhhorod National UniversityUzhhorodDaleka Str.2A88000Ukraine Institute of Physics Faculty of ScienceUniversity of P.J.SafarikKosicePark Angelinum 904001Slovakia

We present the first BVR photometry,period variation and photometric light curve analysis of two poorly studied eclipsing binaries,V1321 Cyg and CR *** were carried out from November 2017 to January 2020 at the observatory of Uzhhorod National *** variations were studied using all available early published as well as our minima *** used the newly developed ELIS a code for the light curve analysis and determination of photometric parameters for both *** found that V1321 Cyg is a close detached eclipsing system with a low photometric mass ratio of q=0.28 which suggests that the binary is a post-mass transfer *** significant period changes in this system are *** Tau is,on the other hand,a semi-detached system where the secondary component almost fills its Roche *** detected a long-term period increase at a rate of 1.49 × 10^(-7) d yr^(-1),which supports mass transfer from the lower mass secondary component to the more massive primary.

关键词： binaries:close binaries:eclipsing stars:individual(V1321 Cyg CR Tau)

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Is the W-boson mass enhanced by the axion-like particle,dark photon,or chameleon dark energy?

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Science China(Physics,Mechanics & Astronomy) 2022年第12期65卷 145-152页

作者： Guan-Wen Yuan Lei Zu Lei Feng Yi-Fu Cai Yi-Zhong Fan Key laboratory of Dark Matter and space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing210023China School of Astronomy and space Science University of Science and Technology of ChinaHefei230026China Department of Astronomy School of Physical SciencesUniversity of Science and Technology of ChinaHefei230026China CAS Key laboratory for researches in Galaxies and Cosmology University of Science and Technology of ChinaHefei230026China

The W-boson mass(m W=(80.4335±0.0094)Ge V)measured by the Collider Detector at Fermilab Collaboration is greater than the standard model(SM)prediction at a confidence level of 7σ,strongly suggesting the presence of new particles or *** the literature,various new particles and/or fields have been introduced to explain the astrophysical and experimental data,and their presence,in principle,may also enhance the W-boson *** this study,we investigate axion-like particle(ALP),dark photon(DP),and chameleon dark energy(DE)models for a solution to the W-boson mass *** find that the ALP and DP interpretations have been significantly narrowed down by global electroweak *** possibility of attributing the W-boson mass anomaly to the chameleon DE is ruled out by other experiments.

关键词： W-boson mass axion-like particle dark photon chameleon dark energy

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