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Article overview
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Gravitational wave consistency relations for multifield inflation | Layne C. Price
; Hiranya V. Peiris
; Jonathan Frazer
; Richard Easther
; | Date: |
8 Sep 2014 | Abstract: | We study the tensor spectral index $n_t$ and the tensor-to-scalar ratio $r$
in the simplest multifield extension to single-field, slow-roll inflation
models. We show that multifield models with potentials $V sim sum_i lambda_i
|phi_i|^p$ have different predictions for $n_t/r$ than single-field models,
even when all the couplings are equal $lambda_i=lambda_j$, due to the
probabilistic nature of the fields’ initial values. We analyze simple prior
probabilities for the $lambda_i$ and initial conditions to make detailed
predictions for the marginalized probability distribution of $n_t/r$. With
$mathcal O (100)$ fields and $p>3/4$, we find that $n_t/r$ differs from the
single-field result of $n_t/r=-1/8$ at the 5$sigma$ level. This gives a novel
and testable prediction for the simplest multifield inflation models. | Source: | arXiv, 1409.2498 | Services: | Forum | Review | PDF | Favorites |
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