Report/Journal Article

PUBDB-2018-05008

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Probing non-Gaussian stochastic gravitational wave backgrounds with LISA

Bartolo, N. ; Domcke, V.DESY* ; Figueroa, D. G. ; Garcia-Bellido, J. ; Peloso, M. ; Pieroni, M. ; Ricciardone, A. (Corresponding author) ; Sakellariadou, M. ; Sorbo, L. ; Tasinato, G.

2018
IOP London

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Please use a persistent id in citations: doi:10.1088/1475-7516/2018/11/034  doi:10.3204/PUBDB-2018-05008

Report No.: ACFI-T18-08; CERN-TH-2018-130; DESY-18-086; IFT-UAM-CSIC-18-58; KCL-PH-TH-2018-22; UMN-TH-3720-18; arXiv:1806.02819

Abstract: 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.

Note: © IOP Publishing Ltd and Sissa Medialab

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF3-611) (POF3-611)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2018

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint/Report Bartolo, N. ; Domcke, V.DESY* ; Figueroa, D. G. (Corresponding author) ; Garcia-Bellido, J. ; Peloso, M. ; Pieroni, M. ; Ricciardone, A. ; Sakellariadou, M. ; Sorbo, L. ; Tasinato, G.
Probing non-Gaussian Stochastic Gravitational Wave Backgrounds with LISA
[10.3204/PUBDB-2018-02233]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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