The recently observed gravitational wave background is explained in terms of the quantum modification of the general relativity (Qmoger). Some UFO, FRB and supernova flares also can be explained in terms of Qmoger.
For the stochastic gravitational wave backgrounds(SGWBs)search centred at the milli-Hz band,the galactic foreground produced by white dwarf binaries(WDBs)within the Milky Way contaminates the extra-galactic signal sev...For the stochastic gravitational wave backgrounds(SGWBs)search centred at the milli-Hz band,the galactic foreground produced by white dwarf binaries(WDBs)within the Milky Way contaminates the extra-galactic signal severely.Because of the anisotropic distribution pattern of the WDBs and the motion of the space-borne gravitational wave interferometer constellation,the time-domain data stream will show an annual modulation.This property is fundamentally diferent from those of the SGWBs.In this article,we propose a new filtering method for the data vector based on the annual modulation phenomenon.We apply the resulted inverse variance filter to the LISA Data Challenge.The result shows that for the weaker SGWB signal,such as energy density Ω_(astro)=1×10^(-12),the filtering method can enhance the posterior distribution peak prominently.For the stronger signal,such as Ω_(astro)=3×10^(-12),the method can improve the Bayesian evidence from“substantial”to“strong”against null hypotheses.This method is model-independent and self-contained.It does not ask for other types of information besides the gravitational wave data.展开更多
A stochastic background of gravitational waves with astrophysical origins may have＇resulted from the superposition of a large number of unresolved sources since the beginning of stellar activity. Its detection would ...A stochastic background of gravitational waves with astrophysical origins may have＇resulted from the superposition of a large number of unresolved sources since the beginning of stellar activity. Its detection would put very strong constraints on the physical properties of compact objects, the initial mass function and star for- marion history. On the other hand, it could be a ＇noise＇ that would mask the stochastic background of its cosmological origin. We review the main astrophysical processes which are able to produce a stochastic background and discuss how they may differ from the primordial contribution in terms of statistical properties. Current detection methods are also presented.展开更多
The space-based laser interferometers,LISA,Taiji and TianQin,are targeting to observe milliHz gravitational waves(GWs)in the 2030s.The joint observations from multiple space-based detectors yield significant advantage...The space-based laser interferometers,LISA,Taiji and TianQin,are targeting to observe milliHz gravitational waves(GWs)in the 2030s.The joint observations from multiple space-based detectors yield significant advantages.In this work,we recap the studies and investigations for the joint space-based GW detector networks to highlight:1)the high precision of sky localization for the massive binary black hole(BBH)coalescences and the GW sirens in the cosmological implication,2)the effectiveness to test the parity violation in the stochastic GW background observations,3)the efficiency of subtracting galactic foreground,4)the improvement in stellar-mass BBH observations.We inspect alternative networks by trading off massive BBH observations and stochastic GW background observation.展开更多
The measurement of gravitational waves produced by binary black-hole mergers at the Advanced LIGO has encouraged extensive studies on the stochastic gravitational wave background. Recent studies have focused on gravit...The measurement of gravitational waves produced by binary black-hole mergers at the Advanced LIGO has encouraged extensive studies on the stochastic gravitational wave background. Recent studies have focused on gravitational wave sources made of the same species, such as mergers from binary primordial black holes or those from binary astrophysical black holes. In this paper, we study a new possibility - the stochastic gravitational wave background produced by mergers of one primordial black hole and one astrophysical black hole. Such systems are necessarily present if primordial black holes exist. We study the isotropic gravitational wave background produced through the history of the universe. We find it is very challenging to detect such a signal. We also demonstrate that it is improper to treat the gravitational waves produced by such binaries in the Milky Way as a directional stochastic background due to a very low binary formation rate.展开更多
文摘The recently observed gravitational wave background is explained in terms of the quantum modification of the general relativity (Qmoger). Some UFO, FRB and supernova flares also can be explained in terms of Qmoger.
基金supported by the National Key R&D Program of China(Grant Nos.2021YFC2203001,and 2021YFC2203003)National Natural Science Foundation of China(Grant No.12247101)。
文摘For the stochastic gravitational wave backgrounds(SGWBs)search centred at the milli-Hz band,the galactic foreground produced by white dwarf binaries(WDBs)within the Milky Way contaminates the extra-galactic signal severely.Because of the anisotropic distribution pattern of the WDBs and the motion of the space-borne gravitational wave interferometer constellation,the time-domain data stream will show an annual modulation.This property is fundamentally diferent from those of the SGWBs.In this article,we propose a new filtering method for the data vector based on the annual modulation phenomenon.We apply the resulted inverse variance filter to the LISA Data Challenge.The result shows that for the weaker SGWB signal,such as energy density Ω_(astro)=1×10^(-12),the filtering method can enhance the posterior distribution peak prominently.For the stronger signal,such as Ω_(astro)=3×10^(-12),the method can improve the Bayesian evidence from“substantial”to“strong”against null hypotheses.This method is model-independent and self-contained.It does not ask for other types of information besides the gravitational wave data.
文摘A stochastic background of gravitational waves with astrophysical origins may have＇resulted from the superposition of a large number of unresolved sources since the beginning of stellar activity. Its detection would put very strong constraints on the physical properties of compact objects, the initial mass function and star for- marion history. On the other hand, it could be a ＇noise＇ that would mask the stochastic background of its cosmological origin. We review the main astrophysical processes which are able to produce a stochastic background and discuss how they may differ from the primordial contribution in terms of statistical properties. Current detection methods are also presented.
基金supported in part by the National Natural Science Foundation of China(11821505)supported in part by the National Key Research and Development Program of China(2020YFC2201501)+7 种基金in part by the National Natural Science Foundation of China(12075297 and 12235019)supported in part by the National Key R&D Program of China(2021YFC2203001)supported by the National Natural Science Foundation of China(12147132)supported by the National Key Program for Science and Technology Research and Development(2020YFC2201400,2022YFC2205201)supported in part by the National Key R&D Program of China under(2021YFC2201901)supported in part by JSPS Kakenhi Grant-in-Aid for Scientific Research(17H06358,19K03870 and 23K03385)supported by the National Key R&D Program of China(2021YFC2201903)National Natural Science Foundation of China(12003059).
文摘The space-based laser interferometers,LISA,Taiji and TianQin,are targeting to observe milliHz gravitational waves(GWs)in the 2030s.The joint observations from multiple space-based detectors yield significant advantages.In this work,we recap the studies and investigations for the joint space-based GW detector networks to highlight:1)the high precision of sky localization for the massive binary black hole(BBH)coalescences and the GW sirens in the cosmological implication,2)the effectiveness to test the parity violation in the stochastic GW background observations,3)the efficiency of subtracting galactic foreground,4)the improvement in stellar-mass BBH observations.We inspect alternative networks by trading off massive BBH observations and stochastic GW background observation.
基金Supported by the National Key Research and Development Program of China (2020YFC2201501)supported by the National Natural Science Foundation of China (12025507, 12150015, 12047503)+4 种基金the Strategic Priority Research Program and Key Research Program of Frontier Science of the Chinese Academy of Sciences (XDB21010200, XDB23010000, ZDBS-LY-7003)CAS project for Young Scientists in Basic Research YSBR-006supported by the International Postdoctoral Exchange Fellowship Programby the National Science Foundation of China (12022514,11875003)supported by U.S. Department of Energy(DESC0009959)
文摘The measurement of gravitational waves produced by binary black-hole mergers at the Advanced LIGO has encouraged extensive studies on the stochastic gravitational wave background. Recent studies have focused on gravitational wave sources made of the same species, such as mergers from binary primordial black holes or those from binary astrophysical black holes. In this paper, we study a new possibility - the stochastic gravitational wave background produced by mergers of one primordial black hole and one astrophysical black hole. Such systems are necessarily present if primordial black holes exist. We study the isotropic gravitational wave background produced through the history of the universe. We find it is very challenging to detect such a signal. We also demonstrate that it is improper to treat the gravitational waves produced by such binaries in the Milky Way as a directional stochastic background due to a very low binary formation rate.
基金supported in part by the National Key R&D Program of China(2021YFC2203100)CAS Young Interdisciplinary Innovation Team(JCTD-2022–20)+8 种基金the National Natural Science Foundation of China(11875113,11961131007,12261131497,12003029,11833005,and 12192224)the 111 Project for“Observational and Theoretical Research on Dark Matter and Dark Energy”(B23042)Fundamental Research Funds for Central Universitiesthe Disposizione del Presidente INFN n.24433 in INFN Sezione di MilanoChina Postdoctoral Science Foundation(2023TQ0355)CSC Innovation Talent FundsUSTC Fellowship for International CooperationUSTC Research Funds of the Double First-Class InitiativeCAS project for young scientists in basic research(YSBR-006)。
基金supported by the National Natural Science Foundation of China(12105248,11821505,12075300,and 12335005)the Peng-Huan-Wu Theoretical Physics Innovation Center(12047503)+1 种基金the Key R&D Program of the Ministry of Science and Technology(2017YFA0402204)the Key Research Program of the Chinese Academy of Sciences(XDPB15)。
