丁香园AV

Synopsis

The cosmological constant (cc) problem is one of the most difficult problems in theoretical physics and cosmology. The observational upper bound on the cc is smaller than what is naively expected quantum mechanically by 120 orders of magnitude. At present there is no theory that can convincingly explain this small value. In this talk I present a cosmological model of an early-time scenario that incorporates a relaxation process of the would-be large vacuum energy, followed by a reheating era connecting to the standard hot big bang universe.