TY - JOUR
T1 - Multimessenger cosmology
T2 - Correlating cosmic microwave background and stochastic gravitational wave background measurements
AU - Adshead, Peter
AU - Afshordi, Niayesh
AU - Dimastrogiovanni, Emanuela
AU - Fasiello, Matteo
AU - Lim, Eugene A.
AU - Tasinato, Gianmassimo
N1 - Funding Information:
We are delighted to thank Ameek Malhotra for insightful input on Sec. . The work of P. A. was supported by the US Department of Energy through Grant No. DE-SC0015655. N. A. acknowledges support by the University of Waterloo, Natural Sciences and Engineering Research Council of Canada, and the Perimeter Institute for Theoretical Physics (PITP). Research at P. I. T. P. is supported in part by the Government of Canada through the Department of Innovation, Science and Economic Development Canada and by the Province of Ontario through the Ministry of Colleges and Universities. The work of M. F. is supported in part by the UK STFC Grant No. ST/S000550/1 and the “Atracción de Talento” Grant No. 2019-T1/TIC-15784. E. A. L. is supported by an STFC AGP-AT grant (No. ST/P000606/1). The work of G. T. is partially funded by STFC Grant No. ST/P00055X/1. P. A., E. D., and M. F. acknowledge the hospitality of the Kavli Institute for Theoretical Physics, which is supported in part by the National Science Foundation under Grant No. NSF-PHY-1748958. We thank the organizers of the “Gravitational Waves from the Early Universe” workshop at NORDITA for their hospitality where some of this work was done.
Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/1/26
Y1 - 2021/1/26
N2 - 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). We show 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.
AB - 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). We show 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.
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U2 - 10.1103/PhysRevD.103.023532
DO - 10.1103/PhysRevD.103.023532
M3 - Article
AN - SCOPUS:85100313916
SN - 2470-0010
VL - 103
JO - Physical Review D
JF - Physical Review D
IS - 2
M1 - 023532
ER -