The spectrum of tensor perturbations in warm inflation

Abstract

We compute the spectrum of tensor perturbations in warm inflation. We find that the spectrum, besides the standard component $\propto H^2/M_P^2$ associated to the amplification of the tensor vacuum fluctuations, acquires a component $\propto {\ell }_{\mathrm{mfp}}{T}^5/M_P^4$, where ${\ell }_{\mathrm{mfp}}$ and $T$ are respectively the mean free path and the temperature of the thermal degrees of freedom. The new contribution is due to the direct production of gravitational waves by the thermal bath, and can exceed the standard one in a viable region of parameter space. This contribution is dominated by thermal fluctuations at scales longer than ${\ell }_{\mathrm{mfp}}$.

arXiv comment5 pages, 1 figure

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Cited by in corpus (2)

• Gravitational wave background from vacuum and thermal fluctuations during axion-like inflation
• Shapes of non-Gaussianity in warm inflation