The balancing act of template bank construction: inspiral waveform template banks for gravitational-wave detectors and optimizations at fixed computational cost

TL;DR

This paper presents methods to optimize the construction of gravitational-wave template banks by adjusting frequency cutoffs and minimal match criteria, enhancing detection sensitivity without additional computational costs.

Contribution

It introduces optimization techniques for template bank parameters, specifically the lower frequency cutoff and minimal match, to improve gravitational-wave detection sensitivity efficiently.

Findings

Optimized lower frequency cutoff improves detection volume.

Adjusting minimal match enhances sensitivity under computational constraints.

Predicted sensitivity gains for future gravitational-wave searches.

Abstract

Gravitational-wave searches for signals from inspiralling compact binaries have relied on matched filtering banks of waveforms (called template banks) to try to extract the signal waveforms from the detector data. These template banks have been constructed using four main considerations, the region of parameter space of interest, the sensitivity of the detector, the matched filtering bandwidth, and the sensitivity one is willing to lose due to the granularity of template placement, the latter of which is governed by the minimal match. In this work we describe how the choice of the lower frequency cutoff, the lower end of the matched filter frequency band, can be optimized for detection. We also show how the minimal match can be optimally chosen in the case of limited computational resources. These techniques are applied to searches for binary neutron star signals that have been previously performed when analyzing Initial LIGO and Virgo data and will be performed analyzing Advanced LIGO and Advanced Virgo data using the expected detector sensitivity. By following the algorithms put forward here, the volume sensitivity of these searches is predicted to improve without increasing the computational cost of performing the search.