Timing-residual power spectrum of a polarized stochastic gravitational-wave background in pulsar-timing-array observation
學年 111
學期 1
出版（發表）日期 2022-09-02
作品名稱 Timing-residual power spectrum of a polarized stochastic gravitational-wave background in pulsar-timing-array observation
作品名稱（其他語言）
著者 Guo-Chin Liu; Kin-Wang Ng
單位
出版者
著錄名稱、卷期、頁數 Physical Review D 106, 064004
摘要 We study the observation of a stochastic gravitational-wave background (SGWB) made by a pulsar-timing array in the spherical harmonic space of the observable. The observable is a timing residual which is the time-averaged redshift fluctuation of a pulsar over the duration of observation. Using the Sachs-Wolfe line-of-sight integral for the redshift fluctuation, we derive the power spectrum of the timing residual, from which we develop a fast algorithm to compute the overlap reduction functions for the SGWB intensity and polarization anisotropies. We find that the algorithm is less complicated and more efficient than our previous work which is based on the expansion of the polarization basis tensors in terms of spherical harmonics. Also, we use the power spectrum to construct the bipolar spherical harmonic coefficients that characterize the statistical isotropy of the SGWB. In particular, the coefficients for the linear-polarization anisotropy are worked out for the first time. Our harmonic-space method is useful for the data analysis in future pulsar-timing-array observation on a large number of pulsars as well as for the measurement of the statistical isotropy of the SGWB.
關鍵字 Gravitational wave detection;Gravitational waves
語言 en_US
ISSN
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 否
國別 USA
公開徵稿
出版型式 ,電子版
相關連結

機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/124309 )