Constraint on Brans-Dicke theory from intermediate/extreme mass ratio inspirals. Issue 12 (1st December 2022)

• Record Type: Journal Article
• Authors: Jiang, Tong; Dai, Ning; Gong, Yungui; Liang, Dicong; Zhang, Chao
• Is Part Of: Journal of cosmology and astroparticle physics. Volume 2022:Issue 12(2022)
• Publication Date: 2022-12-01
• Subjects: Gravitational waves in GR and beyond : theory -- gravitational waves / theory -- modified gravity; Cosmology -- Periodicals; Astrophysics -- Periodicals; 523.0105
• DOI: 10.1088/1475-7516/2022/12/023
• Languages: English
• ISSNs: 1475-7516

Abstract

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 ω 0 > 10 6 .