Inflation in string theory confronts data/Les mod\`eles d'inflation en th\'eorie des cordes face aux observations

摘要

Following the 2015 Planck release, we briefly comment on the status and someongoing opportunities in the interface between inflationary cosmology, stringtheory, and CMB data. The constraints in the $r$-$n_s$ plane introduce a newparameter into inflationary cosmology relative to the simplest quadraticinflation model, in a direction which fits well with couplings to heavy fieldsas occurs in string theory. The precision of the data permits further searchesfor and constraints on additional model-dependent features, such as oscillatory$N$-spectra, a program requiring specific theoretically motivated shapes. Sincethe perturbations can easily be affected by additional sectors and couplings,null results can usefully bound such contributions. We also review the broaderlessons string theory has contributed to our understanding of primordialinflation, and close with some approaches to a more complete framework.Published in a special volume of Comptes Rendus on Inflation: Theoretical andObservational Status.