AT1 - Extended Theories of Gravity and Quantum Cosmology |
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Speaker |
Modesto, Leonardo |
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| Talk Title |
Inflation in Nonlocal Gravity |
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Abstract |
We show that the ``Starobinsky’’ inflationary spacetime is an exact solution of the Nonlocal Gravity. This theory is ghost-free, finite at quantum level, and perturbatively unitary. Moreover, the spectrum of the theory consists of the graviton and the scalaron that is responsible for driving the inflation. Notably, any further extension of the spectrum leads to propagating ghost degrees of freedom. Further, we give a special account to the cosmological implications of this theory by considering perturbations during inflation. The Nonlocal Gravity model predicts of a modified value, in comparison to the local Starobinsky model, for the ratio of tensor and scalar power spectra r, which can surely meet future observational constraints. |
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