Squeezed tensor non-Gaussianity in non-attractor inflation
| Autor: | Gianmassimo Tasinato, Cari Powell, Ivonne Zavala, Maria Mylova, Susha L. Parameswaran, Ogan Özsoy |
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| Rok vydání: | 2019 |
| Předmět: |
High Energy Physics - Theory
Inflation (cosmology) Physics Cosmology and Nongalactic Astrophysics (astro-ph.CO) Field (physics) 010308 nuclear & particles physics Gravitational wave FOS: Physical sciences Spectral density Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Gravitational wave background High Energy Physics - Theory (hep-th) Non-Gaussianity 0103 physical sciences Tensor Bispectrum Astrophysics - Cosmology and Nongalactic Astrophysics Mathematical physics |
| Zdroj: | Journal of Cosmology and Astroparticle Physics |
| ISSN: | 1475-7516 |
| DOI: | 10.1088/1475-7516/2019/09/036 |
| Popis: | We investigate primordial tensor non-Gaussianity in single field inflation, during a phase of non-attractor evolution when the spectrum of primordial tensor modes can be enhanced to a level detectable at interferometer scales. Making use of a tensor duality we introduced in arXiv:1808.10475, we analytically compute the full bispectrum of primordial tensor fluctuations during the non-attractor era. During this epoch the shape of the tensor bispectrum is enhanced in the squeezed limit, its amplitude can be amplified with respect to slow-roll models, and tensor non-Gaussianity can exhibit a scale dependence distinctive of our set-up. We prove that our results do not depend on the frame used for the calculations. Squeezed tensor non-Gaussianity induces a characteristic quadrupolar anisotropy on the power spectrum of the stochastic background of primordial tensor perturbations. As a step to make contact with gravitational wave experiments, we discuss the response function of a ground based Michelson interferometer to a gravitational wave background with such a feature. Comment: 34 pages, 4 figures |
| Databáze: | OpenAIRE |
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