Gravitational Wave Timing Array @LISAcommunity

Uploaded July 2022 | Updated September 2026, 1 hour ago

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.

Authors: Maria Jose Bustamante-Rosell, Joel Meyers, Aaron Zimmerman, Cynthia Trendafilova, Noah Pearson
Presenter: Maria Jose Bustamante-Rosell

$Calibrating credible intervals for EMRI parameters One of the most exciting gravitational wave source type LISA expects to detect are Extreme Mass-Ratio Inspirals (EMRIs). An EMRI is the slow inspiral of a small compact object (1 - 10 solar masses) into a massive black hole with mass range between 10^{4} and 10^{7} solar masses. EMRI waveforms are modelled using black-hole perturbation theory, where the background black-hole spacetime is perturbed by the self-force effects of the compact objectâ€™s gravitational field on its own orbit. However, the generation of EMRI waveforms to the degree of accuracy that is required for LISA science can be difficult to achieve, both theoretically and computationally. Therefore, LISA analysis will likely make use of approximate waveform models that are faster to generate at the expense of accuracy. Here we present a procedure for estimating the operational coverage of Bayesian credible sets for EMRI signal parameters that are inferred using approximate models. This allows us to quantify the approximation error and enables a subsequent adjustment of the nominal coverage levels. Author and Presenter: Kate Lee$ $Background for gravitational wave signal at LISA from refractive index of solar wind plasma$

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