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- W2038733703 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 well-motivated 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." @default.
- W2038733703 created "2016-06-24" @default.
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- W2038733703 date "2015-01-22" @default.
- W2038733703 modified "2023-09-30" @default.
- W2038733703 title "Gravitational Wave Consistency Relations for Multifield Inflation" @default.
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- W2038733703 doi "https://doi.org/10.1103/physrevlett.114.031301" @default.
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