Probing cosmic anisotropy with gravitational waves as standard sirens

作者：Rong-Gen Cai, Tong-Bo Liu, Xuewen Liu, Shao-Jiang Wang, Tao Yang · 发表于：Physical review. D/Physical review. D. · 年份：2018 · DOI：10.1103/physrevd.97.103005 · 被引用次数：84 · 研究领域：Pulsars and Gravitational Waves Research、Cosmology and Gravitation Theories、Radio Astronomy Observations and Technology

The gravitational wave (GW) as a standard siren directly determines the luminosity distance from the gravitational waveform without reference to the specific cosmological model, of which the redshift can be obtained separately by means of the electromagnetic counterpart like GW events from binary neutron stars and massive black hole binaries (MBHBs). To see to what extent the standard siren can reproduce the presumed dipole anisotropy written in the simulated data of standard siren events from typical configurations of GW detectors, we find that (1) for the Laser Interferometer Space Antenna with different MBHB models during five-year observations, the cosmic isotropy can be ruled out at $3\ensuremath{\sigma}$ confidence level (C.L.) and the dipole direction can be constrained roughly around 20% at $2\ensuremath{\sigma}$ C.L., as long as the dipole amplitude is larger than 0.04, 0.06 and 0.03 for MBHB models Q3d, pop III and Q3nod with increasing constraining ability, respectively; (2) for the Einstein telescope with no less than 200 standard siren events, the cosmic isotropy can be ruled out at $3\ensuremath{\sigma}$ C.L. if the dipole amplitude is larger than 0.06, and the dipole direction can be constrained within 20% at $3\ensuremath{\sigma}$ C.L. if the dipole amplitude is near 0.1; (3) for the Deci-Hertz Interferometer Gravitational wave Observatory with no less than 100 standard siren events, the cosmic isotropy can be ruled out at $3\ensuremath{\sigma}$ C.L. for dipol...