当前位置：
X-MOL 学术
›
J. Cosmol. Astropart. Phys.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Testing gravity with frequency-dependent overlap reduction function in Pulsar Timing Array
Journal of Cosmology and Astroparticle Physics ( IF 5.3 ) Pub Date : 2024-10-30 , DOI: 10.1088/1475-7516/2024/10/097 Qiuyue Liang, Ippei Obata, Misao Sasaki
Journal of Cosmology and Astroparticle Physics ( IF 5.3 ) Pub Date : 2024-10-30 , DOI: 10.1088/1475-7516/2024/10/097 Qiuyue Liang, Ippei Obata, Misao Sasaki
The positive evidence of a nano-hertz gravitational wave background recently found by several pulsar timing array (PTA) collaborations opened up a window to test modified gravity theories in a unique frequency band in parallel to other gravitational wave detection experiments.
In particular, the overlap reduction function (ORF) in PTA observation is sensitive to the phase velocity of gravitational waves.
In this work, we provide analytical expressions for the coefficients of the multipole moments in the ORF, and utilize these analytical results to study constraints on
the phase velocity from the frequency dependent overlap reduction function obtained from the Chinese PTA (CPTA) data.
While the data contain large error bars yet, interesting constraints are found in the frequency-dependent ORF in the case of subluminal phase velocity. This makes us expect that the nano-hertz band gravitational wave background will become one of the important arenas for exploring modified gravity theories.
更新日期：2024-10-30
京公网安备 11010802027423号