Constraint on Brans-Dicke theory from intermediate/extreme mass ratio inspirals
Abstract
Intermediate/Extreme mass ratio inspiral (I/EMRI) system provides a good tool to test the nature of gravity in strong field. Based on the method of osculating orbits, we compute the orbital evolutions of I/EMRIs on quasi-elliptic orbits in both Einstein's general relativity and Brans-Dicke theory. The extra monopolar and dipolar channels in Brans-Dicke theory accelerate the orbital decay, so it is important to consider the effects of monopolar and dipolar emissions on the waveform. With the help of accurate orbital motion, we generate waveform templates which include both monopolar and dipolar contributions for I/EMRIs on eccentric orbits in Brans-Dicke theory. With a two-year observation of gravitational waves emitted from I/EMRIs by LISA, we get the most stringent constraint on the Brans-Dicke coupling parameter .
Keywords
Cite
@article{arxiv.2107.02700,
title = {Constraint on Brans-Dicke theory from intermediate/extreme mass ratio inspirals},
author = {Tong Jiang and Ning Dai and Yungui Gong and Dicong Liang and Chao Zhang},
journal= {arXiv preprint arXiv:2107.02700},
year = {2022}
}
Comments
Major revision by adding discussions on more mass ratios, but conclusions are strengthened, matched to the published JCAP version