Improved reconstruction of a stochastic gravitational wave background with LISA

By Raphael Flauger, N. Karnesis, G. Nardini, M. Pieroni, A. Ricciardone, Jesús Torrado. Journal of Cosmology and Astroparticle Physics, 2020

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We present a data analysis methodology for a model-independent reconstruction of the spectral shape of a stochastic gravitational wave background with LISA. We improve a previously proposed reconstruction algorithm that relied on a single Time-Delay-Interferometry (TDI) channel by including a complete set of TDI channels. As in the earlier work, we assume an idealized equilateral configuration. We test the improved algorithm with a number of case studies, including reconstruction in the presence of two different astrophysical foreground signals. We find that including additional channels helps in different ways: it reduces the uncertainties on the reconstruction; it makes the global likelihood maximization less prone to falling into local extrema; and it efficiently breaks degeneracies between the signal and the instrumental noise.

Subfields: Astronomy and Astrophysics, Oceanography

View Paper: https://www.semanticscholar.org/paper/96e308075c4ecb90c882127dfd1515b9b2ab1927

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In Astronomy and Astrophysics

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Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation (2020, result): “given by comparison to the ‘binned PLIS’ [63, 64].”