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Title: Probing non-Gaussian stochastic gravitational wave backgrounds with LISA

Journal Article · · Journal of Cosmology and Astroparticle Physics
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10]
  1. Univ. degli Studi di Padova (Italy); Istituto Nazionale di Fisica Nucleare (INFN), Padova (Italy); Istituto Nazionale di Astrofisica (INAF), Padova (Italy); DOE/OSTI
  2. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  3. École Polytechnique Fédérale de Lausanne (EPFL), Lausanne (Switzerland). Laboratory of Particle Physics and Cosmology Institute of Physics (LPPC)
  4. European Organization for Nuclear Research (CERN), Geneva (Switzerland); Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain)
  5. Univ. degli Studi di Padova (Italy); Univ. of Minnesota, Minneapolis, MN (United States)
  6. Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain)
  7. University of Stavanger (Norway)
  8. Univ. of London (United Kingdom)
  9. Univ. of Massachusetts, Amherst, MA (United States)
  10. Swansea University (United Kingdom)
+ Show Author Affiliations

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. This observable can be crucial to discriminate whether a SGWB has a primordial or astrophysical origin. Compared to the two-point function, the SGWB three-point function has a richer dependence on the gravitational wave momenta and chiralities. It can be used therefore as a powerful discriminator between different models. For the first time we provide the response functions of LISA 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 a non-Gaussian SGWB.

Research Organization:
University of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0011842
OSTI ID:
1611677
Journal Information:
Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 11 Vol. 2018; ISSN 1475-7516
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Effects of parity violation on non-gaussianity of primordial gravitational waves in Hořava-Lifshitz gravity text January 2013
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Observed parity-odd CMB temperature bispectrum text January 2014
Gravitational Waves and Scalar Perturbations from Spectator Fields text January 2014
Distinctive signatures of space-time diffeomorphism breaking in EFT of inflation text January 2015
Axion Inflation with an SU(2) Gauge Field: Detectable Chiral Gravity Waves text January 2016
Primordial Gravitational Waves from Axion-Gauge Fields Dynamics text January 2016
Gravitational waves at interferometer scales and primordial black holes in axion inflation text January 2016
Higgsed Gauge-flation text January 2017
Simplifying the EFT of Inflation: Generalized Disformal Transformations and Redundant Couplings text January 2017
Large Tensor Non-Gaussianity from Axion-Gauge Fields Dynamics text January 2017
Stochastic gravitational wave background from smoothed cosmic string loops text January 2017
CMB bounds on tensor-scalar-scalar inflationary correlations text January 2017
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Gravitational waves from gauge preheating text January 2018
Acoustic Signatures in the Primary Microwave Background Bispectrum text January 2000
Non-Gaussian features of primordial fluctuations in single field inflationary models text January 2002
Gravitational lensing as a contaminant of the gravity wave signal in CMB text January 2003
The shape of non-Gaussianities text January 2004
Gravitational wave bursts from cosmic strings text January 2000
Gravitational wave bursts from cusps and kinks on cosmic strings text January 2001
Detecting a stochastic background of gravitational radiation: Signal processing strategies and sensitivities text January 1997
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Cited By (15)

Detecting circular polarisation in the stochastic gravitational-wave background from a first-order cosmological phase transition journal October 2020
Cross-correlations as a diagnostic tool for primordial gravitational waves journal March 2021
A new mechanism to enhance primordial tensor fluctuations in single field inflation journal December 2018
Tensor non-gaussianities from non-minimal coupling to the inflaton journal February 2019
Cosmological shapes of higher-spin gravity journal April 2019
Squeezed tensor non-Gaussianity in non-attractor inflation journal September 2019
Anisotropies and non-Gaussianity of the cosmological gravitational wave background journal December 2019
Gravitational perturbations from oscillons and transients after inflation journal June 2019
Tensor Non-Gaussianity Search: Current Status and Future Prospects journal July 2019
A new mechanism to enhance primordial tensor fluctuations in single field inflation text January 2018
Imprints of Primordial Non-Gaussianity on Gravitational Wave Spectrum text January 2018
Cosmological Shapes of Higher-Spin Gravity text January 2019
Squeezed tensor non-Gaussianity in non-attractor inflation text January 2019
Gravitational perturbations from oscillons and transients after inflation text January 2019
Anisotropies and non-Gaussianity of the Cosmological Gravitational Wave Background text January 2019

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