LitePIG: A Lite Parameter Inference system for the Gravitational wave in the millihertz band

Understand

We present a python based parameter inference system for the gravitational wave (GW) measured in the millihertz band.

• This system includes the following features: the GW waveform originated from the massive black hole binaries (MBHB), the stationary instrumental gaussian noise, the higher-order harmonic modes, the full response function from the time delay interferometry (TDI) and the gaussian likelihood function with the dynamic nested parameter sampler.
• In particular, we highlight the role of higher-order modes.
• By including these modes, the luminosity distance estimation precision can be improved roughly by a factor of 50, compared with the case with only the leading order ($\ell=2,|m|=2$) mode.