Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session C10: Large-Scale Structure and Cosmic Microwave Background
1:30 PM–3:18 PM,
Saturday, April 13, 2019
Sheraton
Room: Governor's Square 12
Sponsoring
Unit:
DAP
Abstract: C10.00004 : Imprints of Primordial Non-Gaussianity on Gravitational Wave Spectrum*
2:06 PM–2:18 PM
Presenter:
Caner Unal
(CEICO, Czech Academy of Sciences, University of Minnesota)
Author:
Caner Unal
(CEICO, Czech Academy of Sciences, University of Minnesota)
Although Cosmic Microwave Background and Large Scale Structure probe the largest scales of our universe with ever increasing precision, our knowledge about the smaller scales is still very limited other than the bounds on Primordial Black Holes. We show that the statistical properties of the small scale quantum fluctuations can be probed via the stochastic gravitational wave background, which is induced as the scalar modes re-enter the horizon. We found that even if scalar curvature fluctuations have a subdominant non-Gaussian component, these non-Gaussian perturbations can source a dominant portion of the induced GWs. Moreover, the GWs sourced by non-Gaussian scalar fluctuations peaks at a higher frequency and this can result in distinctive observational signatures. If the induced GW background is detected, but not the signatures arising from the non-Gaussian component, this translates into stringent bounds on non-Gaussianity depending on the amplitude of the GW signal.
*I will be funded by The COST Action CA16104 Gravitational waves, black holes and fundamental physics (GWverse).
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