# Dr. Dicong Liang's talk 18/10/2021

by **Lijing Shao**

## Dr. Dicong Liang (PKU-KIAA)

#### Constraint on Brans-Dicke theory from Intermediate/Extreme Mass Ratio Inspirals with self-force method

Intermediate/Extreme mass ratio inspiral (IMRI/EMRI) system provides a good tool to test the nature of gravity in strong field. We construct the self-force and use the self-force method to generate accurate waveform templates for IMRIS/EMRIs on quasi-elliptical orbits in Brans-Dicke theory. The extra monopole and dipole emissions in Brans-Dicke theory accelerate the orbital decay, so the observations of gravitational waves may place stronger constraint on Brans-Dicke theory. With a two-year observations of gravitational waves emitted from IMRIs/EMRIs with LISA, we can get the most stringent constraint on the Brans-Dicke coupling parameter ω_0>10^5. [link]

**Place**: KIAA 1st meeting room + zoom Meeting ID: 822 8287 7472, Passcode: astroPKU

**Time**: Monday, October 18, 2021 - 1:30PM to Monday, October 18, 2021 - 2:20PM