Optimizing the regimes of the Advanced LIGO gravitational wave detector for multiple source types

Abstract

We developed algorithms which allow us to find regimes of the signal-recycled Fabry-Perot--Michelson interferometer [for example, the Advanced Laser Interferometric Gravitational Wave Observatory (LIGO)], optimized concurrently for two (binary inspirals $+$ bursts) and three (binary inspirals $+$ bursts $+$ millisecond pulsars) types of gravitational wave sources. We show that there exists a relatively large area in the interferometer parameters space where the detector sensitivity to the first two kinds of sources differs only by a few percent from the maximal ones for each kind of source. In particular, there exists a specific regime where this difference is $\ensuremath{\approx}0.5%$ for both of them. Furthermore, we show that even more multipurpose regimes are also possible that provide significant sensitivity gain for millisecond pulsars with only minor sensitivity degradation for binary inspirals and bursts.