MSSM-inspired Multifield Inflation and Cosmological Attractors

by Prof. Sergey Vernov (Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University)

Monday 10 Jul 2017, 15:00 → 16:00 Europe/Rome

Aula Teorici (Dipartimento di Fisica e Astronomia)

Despite the fact that experimentally with a high degree of statistical significance only a single Standard Model--like Higgs boson is discovered at the LHC, extended Higgs sectors with multiple scalar fields not excluded by combined fits of the data are more preferable theoretically for internally consistent realistic models of particle physics. We analyze the inflationary scenarios which could be induced by the two-Higgs-doublet potential of the Minimal Supersymmetric Standard Model (MSSM) where five scalar fields have nonminimal couplings to gravity. Observables following from such MSSM-inspired multifield inflation are calculated and a number of consistentinflationary scenarios are constructed. Cosmological evolution with different initial conditions for the multifield system leads to consequences fully compatible with observational data on the spectral index and the tensor-to-scalar ratio. It is demonstrated that the strong coupling approximation is precise enough to describe such inflationary scenarios. The talk is based on the recent paper: M.N. Dubinin, E.Yu. Petrova, E.O. Pozdeeva, M.V. Sumin and S.Yu. Vernov, arXiv:1705.09624 [hep-ph].