Reconstructing the spectral shape of a stochastic gravitational wave background with LISA

By C. Caprini, Daniel G. Figueroa, Raphael Flauger, G. Nardini, Marco Peloso, M. Pieroni, A. Ricciardone, G. Tasinato. Journal of Cosmology and Astroparticle Physics, 2019

258 citations recorded by the source corpus.

We present a set of tools to assess the capabilities of LISA to detect and reconstruct the spectral shape and amplitude of a stochastic gravitational wave background (SGWB) . We first provide the LISA power-law sensitivity curve and binned power-law sensitivity curves, based on the latest updates on the LISA design. These curves are useful to make a qualitative assessment of the detection and reconstruction prospects of a SGWB . For a quantitative reconstruction of a SGWB with arbitrary power spectrum shape, we propose a novel data analysis technique: by means of an automatized adaptive procedure, we conveniently split the LISA sensitivity band into frequency bins, and fit the data inside each bin with a power law signal plus a model of the instrumental noise. We apply the procedure to SGWB signals with a variety of representative frequency profiles, and prove that LISA can reconstruct their spectral shape. Our procedure, implemented in the code SGWBinner, is suitable for homogeneous and isotropic SGWBs detectable at LISA, and it is also expected to work for other GW observatories.

View Paper: https://www.semanticscholar.org/paper/7139cf4c98c9e95242a4386643962ce1f573aa0f

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Citations in the corpus

Science case for the Einstein telescope (2019, unknown): “To separate the cosmological and the astrophysical backgrounds the first step will be to use any distinct spectral dependence of the average (monopole) amplitude ΩGW [144].”
Oscillations in the stochastic gravitational wave background from sharp features and particle production during inflation (2020, methodology): “Tools have already been developed to successfully reconstruct the spectral shape of mock SGWB signals with LISA [60], including a wiggly signal.”
Generating PBHs and small-scale GWs in two-field models of inflation (2020, background): “conrm or reject this scenario (or even tell the dierence between the two non-canonical coupling) by reconstructing the GW signal in the lucky event of a detection of a SBGW by future GW experiments [111,112]. 7 Discussion We have presented a generic mechanism that operates in models where in ation c”
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Updated predictions for gravitational waves produced in a strongly supercooled phase transition (2020, methodology): “22 in this model the LHC lower limit on mZ′ reduces the chances for detection of a GW signal by LISA [66, 67], and that the suppression by matter domination of the peak for large mZ′ appears to preclude measurement of this GW signal by ET [72, 73].”
Probing the gravitational wave background from cosmic strings with LISA (2019, methodology): “[175] is required to assess the S/N for a given detection, see also [177].”
Improved reconstruction of a stochastic gravitational wave background with LISA (2020, methodology): “[42] from a single channel to the use of the three TDI 1.”