On the Three Primordial Numbers

Roberto Gobbetti, Enrico Pajer, Diederik Roest

OnderzoeksoutputAcademicpeer review

12 Citaten (Scopus)
249 Downloads (Pure)


Cosmological observations have provided us with the measurement of just three numbers that characterize the very early universe: $ 1-n_{s} $, $ N $ and $\ln\Delta_R^2$. Although each of the three numbers individually carries limited information about the physics of inflation, one may hope to extract non-trivial information from relations among them. Invoking minimality, namely the absence of ad hoc large numbers, we find two viable and mutually exclusive inflationary scenarios. The first is the well-known inverse relation between $1- n_{s} $ and $ N $. The second implies a new relation between $ 1-n_{s} $ and $\ln\Delta_R^2$, which might provide us with a handle on the beginning of inflation and predicts the intriguing $\textit{lower}$ bound on the tensor-to-scalar ratio $ r> 0.006 $ ($ 95\% $ CL).
Originele taal-2English
TijdschriftJournal of Cosmology and Astroparticle Physics
StatusPublished - 25-sep-2015

Citeer dit