Vanilla Inflation Predicts Negative Running

Vanilla Inflation Predicts Negative Running
Jerome Martin, Christophe Ringeval, Vincent Vennin
arXiv:2404.15089v1 Announce Type: new
Abstract: We show that the simplest, and currently favoured, theoretical realizations of cosmic inflation yield a sharp prediction for the running of the spectral index $alpha_mathrm{S}$. Using latest cosmological data, we compute its marginalized posterior probability distribution over the space of nearly 300 models of single-field slow-roll inflation. The most probable value is $alpha_mathrm{S}=-6.3 times 10^{-4}$, lying within the $98%$ credible interval $-1.8 times 10^{-3}arXiv:2404.15089v1 Announce Type: new
Abstract: We show that the simplest, and currently favoured, theoretical realizations of cosmic inflation yield a sharp prediction for the running of the spectral index $alpha_mathrm{S}$. Using latest cosmological data, we compute its marginalized posterior probability distribution over the space of nearly 300 models of single-field slow-roll inflation. The most probable value is $alpha_mathrm{S}=-6.3 times 10^{-4}$, lying within the $98%$ credible interval $-1.8 times 10^{-3}