Continuous spectrum on cosmological collider
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Publication:6044330
DOI10.1088/1475-7516/2023/04/002zbMATH Open1522.83272arXiv2301.07920OpenAlexW4362578869MaRDI QIDQ6044330
Author name not available (Why is that?)
Publication date: 17 May 2023
Published in: (Search for Journal in Brave)
Abstract: We study the effects of a massive field with a continuous spectrum (continuum isocurvaton) on the inflationary bispectrum in the squeezed limit. As a concrete example, we extend the quasi-single field inflation model to include a continuum isocurvaton with a well-motivated spectral density from extra dimensions and focus on a contribution to the bispectrum with a single continuum isocurvaton exchange. In contrast to the usual case without the continuous spectrum, the amplitude of the bispectrum has a damping feature in the deep squeezed limit, which can be strong evidence for the continuous spectrum.
Full work available at URL: https://arxiv.org/abs/2301.07920
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