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Multimessenger cosmology: Correlating cosmic microwave background and stochastic gravitational wave background measurements

Journal Article · · Physical Review. D.
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); OSTI
  2. Univ. of Waterloo, ON (Canada)
  3. Univ. of New South Wales, Sydney, NSW (Australia)
  4. Univ. of Portsmouth (United Kingdom); Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain); Autonomous Univ. of Madrid (Spain)
  5. King's College, London (United Kingdom)
  6. Swansea University (United Kingdom)
+ Show Author Affiliations
Characterizing the physical properties of the stochastic gravitational wave background (SGWB) is a key step towards identifying the nature of its possible origin. We focus our analysis on SGWB anisotropies. The existence of a nontrivial primordial scalar-tensor-tensor (STT) correlation in the squeezed configuration may be inferred from the effect that a long wavelength scalar mode has on the gravitational wave power spectrum: an anisotropic contribution. Crucially, such a contribution is correlated with temperature anisotropies in the cosmic microwave background (CMB). This paper shows that, for inflationary models that generate suitably large STT non-Gaussianities, cross correlating the CMB with the stochastic background of gravitational waves is a very effective probe of early universe physics. The resulting signal can be a smoking gun for primordial SGWB anisotropies.
Research Organization:
University of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0015655
OSTI ID:
1852005
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 2 Vol. 103; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
Astronomy & Astrophysics
Cosmic microwave background
Gravitational waves
Inflation
Physics