Non-Gaussian Stochastic Gravitational Waves from Phase Transitions
arXiv:2102.05665 · doi:10.1007/JHEP11(2021)107
Abstract
Cosmological phase transitions in the primordial universe can produce anisotropic stochastic gravitational wave backgrounds (GWB), similar to the cosmic microwave background (CMB). For adiabatic perturbations, the fluctuations in GWB follow those in the CMB, but if primordial fluctuations carry an isocurvature component, this need no longer be true. It is shown that in non-minimal inflationary and reheating settings, primordial isocurvature can survive in GWB and exhibit significant non-Gaussianity (NG) in contrast to the CMB, while obeying current observational bounds. While probing such NG GWB is at best a marginal possibility at LISA, there is much greater scope at future proposed detectors such as DECIGO and BBO. It is even possible that the first observations of inflation-era NG could be made with gravitational wave detectors as opposed to the CMB or Large-Scale Structure surveys.
12+3 pages, 2 figures
References in corpus (7)
- GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
- Gravitational Wave Production by Collisions: More Bubbles
- Gravitational Waves from Warped Spacetime
- Searching for cosmological gravitational-wave backgrounds with third-generation detectors in the presence of an astrophysical foreground
- Maximum likelihood map-making with the Laser Interferometer Space Antenna
- Subtraction-noise projection in gravitational-wave detector networks
- General treatment of isocurvature perturbations and non-Gaussianities
Cited by in corpus (9)
- Cosmology with the Laser Interferometer Space Antenna
- Probing Anisotropies of the Stochastic Gravitational Wave Background with LISA
- Detection of Early-Universe Gravitational Wave Signatures and Fundamental Physics
- A quasar-based supermassive black hole binary population model: implications for the gravitational-wave background
- Enhancing gravitational wave anisotropies with peaked scalar sources
- New universal property of cosmological gravitational wave anisotropies
- Sensitivity to Dark Sector Scales from Gravitational Wave Signatures
- Large Primordial Fluctuations in Gravitational Waves from Phase Transitions
- Primordial Clocks within Stochastic Gravitational Wave Anisotropies