摘要
We perform the first search for an isotropic non-tensorial gravitational-wave background(GWB) allowed in general metric theories of gravity in the North American Nanohertz Observatory for Gravitational Waves(NANOGrav) 12.5-year data set. By modeling the GWB as a power-law spectrum, we find strong Bayesian indication for a spatially correlated process with scalar transverse(ST) correlations whose Bayes factor versus the spatially uncorrelated common-spectrum process is 107 ± 7, but no statistically significant evidence for the tensor transverse, vector longitudinal, and scalar longitudinal polarization modes. The median and the 90% equal-tail amplitudes of ST mode are ■ , or equivalently the energy density parameter per logarithm frequency is ■, at frequency of 1/year.
基金
supported by the National Key Research and Development Program of China (Grant No.2020YFC2201502)
the National Natural Science Foundation of China (Grant Nos.11975019,11690021,11991052,and 12047503)
the Key Research Program of Frontier Sciences,Chinese Academy of Sciences (Grant No.ZDBS-LY-7009)
the Chinese Academy of Sciences Project for Young Scientists in Basic Research (Grant No.YSBR006)
the Key Research Program of the Chinese Academy of Sciences (Grant No.XDPB15)。
作者简介
Corresponding author:Qing-Guo Huang,email:huangqg@itp.ac.cn。
