TY  - EJOUR
AU  - Bartolo, Nicola
AU  - Domcke, Valerie
AU  - Figueroa, Daniel G.
AU  - Garcia-Bellido, Juan
AU  - Peloso, Marco
AU  - Pieroni, Mauro
AU  - Ricciardone, Angelo
AU  - Sakellariadou, Mairi
AU  - Sorbo, Lorenzo
AU  - Tasinato, Gianmassimo
TI  - Probing non-Gaussian Stochastic Gravitational Wave Backgrounds with LISA
IS  - DESY-18-086
M1  - PUBDB-2018-02233
M1  - DESY-18-086
M1  - CERN-TH-2018-130
M1  - UMN-TH-3720-18
M1  - IFT-UAM-CSIC-18-58
M1  - KCL-PH-TH-2018-22
M1  - ACFI-T18-08
M1  - arXiv:1806.02819
PY  - 2018
AB  - The stochastic gravitational wave background (SGWB) contains a wealth of information on astrophysical and cosmological processes. A major challenge of upcoming years will be to extract the information contained in this background and to disentangle the contributions of different sources. In this paper we provide the formalism to extract, from the correlation of three signals in the Laser Interferometer Space Antenna (LISA), information about the tensor three-point function, which characterizes the non-Gaussian properties of the SGWB. Compared to the two-point function, the SGWB three-point function has a richer dependence on the gravitational wave momenta and chiralities, and a larger number of signal channels. It can be used therefore as a powerful discriminator between different models. We provide LISA's response functions to a general SGWB three-point function. As examples, we study in full detail the cases of an equilateral and squeezed SGWB bispectra, and provide the explicit form of the response functions, ready to be convoluted with any theoretical prediction of the bispectrum to obtain the observable signal. We further derive the optimal estimator to compute the signal-to-noise ratio. Our formalism covers general shapes of non-Gaussianity, and can be extended straightaway to other detector geometries. Finally, we provide a short overview of models of the early universe that can give rise to non-Gaussian SGWB.
LB  - PUB:(DE-HGF)25 ; PUB:(DE-HGF)29
DO  - DOI:10.3204/PUBDB-2018-02233
UR  - https://bib-pubdb1.desy.de/record/405621
ER  -