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Résumé |
I will talk about the cosmological consequences of Weyl anomalies
arising from the renormalization of composite operators in a theory of
gravity with a cosmological constant. Near two dimensions, the relevant
anomaly can be computed explicitly using results from Liouville theory
and leads to a non-local quantum effective action. The resulting quantum
energy momentum tensor is non-local and leads to a decaying vacuum
energy in a homogeneous and isotropic expanding universe.
I will discuss a generalization of these results to four dimensions and
possible implications for inflation, the cosmological constant problem,
and de Sitter spacetime. |
