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Theoretical Physycs Group at Scuola Normale Superiore
Piazza dei Cavalieri, 7
56100 Pisa PI - Italy
ph. +39 050 509203
ph. +39 050 509111

Enrico Trincherini (SNS & INFN, Pisa)

Relaxing the Cosmological Constant

I will present a scenario whereby an initially large cosmological constant is relaxed down to the observed value due to the dynamics of a scalar field evolving on a very shallow potential. The model crucially relies on a sector that violates the null energy condition (NEC) and gets activated only when the Hubble rate becomes sufficiently small, of the order of the present one. As a result of NEC violation, this low-energy universe evolves into inflation, followed by reheating and the standard Big Bang cosmology.