Assessing the data-analysis impact of LISA orbit approximations using a GPU-accelerated response model

Understand

The analysis of gravitational wave (GW) datasets is based on the comparison of measured time series with theoretical templates of the detector's response to a variety of source parameters.

• For LISA, the main scientific observables will be the so-called time-delay interferometry (TDI) combinations, which suppress the otherwise overwhelming laser noise.
• Computing the TDI response to GW involves projecting the GW polarizations onto the LISA constellation arms, and then combining projections delayed by a multiple of the light propagation time along the arms.
• Both computations are difficult to perform efficiently for generic LISA orbits and GW signals.