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

TL;DR

This paper presents algorithms to optimize Advanced LIGO's interferometer settings for multiple gravitational wave source types simultaneously, achieving high sensitivity across diverse sources with minimal trade-offs.

Contribution

It introduces algorithms for multi-source optimization of LIGO's interferometer parameters, enabling near-maximal sensitivity for binary inspirals, bursts, and millisecond pulsars concurrently.

Findings

Existence of a large parameter space region with near-optimal sensitivity for binary inspirals and bursts.

Identification of a specific regime with ~0.5 sensitivity difference for both sources.

Development of multipurpose regimes that enhance millisecond pulsar detection with minor impact on other sources.

Abstract

We develop here algorithms which allow to find regimes of signal-recycled Fabry-Perot--Michelson interferometer (for example, Advanced LIGO), optimized concurrently for two (binary inspirals + bursts) and three (binary inspirals + bursts + millisecond pulsars) types of gravitational waves sources. We show that there exists a relatevely 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 ~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.