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Improved reconstruction of a stochastic gravitational wave background with LISA

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arxiv 2009.11845 v2 pith:RFAFYG3A submitted 2020-09-24 astro-ph.CO gr-qchep-ph

Improved reconstruction of a stochastic gravitational wave background with LISA

classification astro-ph.CO gr-qchep-ph
keywords reconstructionincludingalgorithmbackgroundchannelsdifferentgravitationalimproved
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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