Cosmological constant: relaxation vs multiverse
arXiv:1904.07876 · doi:10.1016/j.physletb.2019.134901
Abstract
We consider a scalar field with a bottom-less potential, such as , finding that cosmologies unavoidably end up with a crunch, late enough to be compatible with observations if . If rebounces avoid singularities, the multiverse acquires new features; in particular probabilities avoid some of the usual ambiguities. If rebounces change the vacuum energy by a small enough amount, this dynamics selects a small vacuum energy and becomes the most likely source of universes with anthropically small cosmological constant. Its probability distribution could avoid the gap by 2 orders of magnitude that seems left by standard anthropic selection.
15 pages, 3 figures; published version
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