Speaker
Description
Next-generation gravitational wave (GW) observatories, such as the Einstein Telescope, will enable tests of General Relativity (GR) with unprecedented precision. Parameter estimation, however, typically assumes detector noise to be Gaussian and stationary, an assumption that is violated by transient noise artifacts, or “glitches”. These must be carefully accounted for and removed from the data before performing the sensitive tests of GR. Recent studies have shown that current glitch-mitigation techniques can introduce biases in parameter estimation due to residual glitch power leaking into the reconstructed signal. Given the high sensitivity of parameterised GR tests, such leakage could potentially lead to false violations of GR when glitches overlap with astrophysical signals.
In this work, we assess the robustness of null-stream-based glitch mitigation for tests of GR, taking parameterised tests as an example. We analyse the impact a single glitch has on the TIGER testing framework, depending on its onset time in a non-GR-violating gravitational waveform. We then investigate the impact of the glitch mitigation method on the TIGER tests by cleaning the data using the null stream of a triangular detector and comparing this to standard glitch-mitigation methods applied two non-colocated, L-shaped detectors.