Gravitational Wave Timing Array
Mar\'ia Jos\'e Bustamante-Rosell, Joel Meyers, Noah Pearson, Cynthia, Trendafilova, Aaron Zimmerman

TL;DR
This paper proposes a gravitational wave timing array using space-based detectors like LISA to explore the nanohertz to microhertz frequency band, filling a gap between existing methods without requiring new experiments.
Contribution
It introduces a novel scheme to detect low-frequency gravitational waves by leveraging data from space-based detectors, extending sensitivity into a previously underexplored frequency range.
Findings
Provides sensitivity in the nanohertz to microhertz band
Fills the frequency gap between pulsar timing arrays and LISA
Utilizes existing space-based detector data without additional design changes
Abstract
We describe the design of a gravitational wave timing array, a novel scheme that can be used to search for low-frequency gravitational waves by monitoring continuous gravitational waves at higher frequencies. We show that observations of gravitational waves produced by Galactic binaries using a space-based detector like LISA provide sensitivity in the nanohertz to microhertz band. While the expected sensitivity of this proposal is not competitive with other methods, it fills a gap in frequency space around the microhertz regime, which is above the range probed by current pulsar timing arrays and below the expected direct frequency coverage of LISA. The low-frequency extension of sensitivity does not require any experimental design change to space-based gravitational wave detectors, and can be achieved with the data products that would already be collected by them.
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