SÉMINAIRE DU GRECO
"Dynamics of super-inflation in Loop Quantum Cosmology" |
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N. Nunes |
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We will be looking at the cosmological effects of small scale corrections that arise in Loop Quantum Cosmology (LQC). In particular, we will see how the Friedmann equation is modified under inverse volume and quadratic corrections. We will see that a positively curved universe can undergo a period of several expanding and contracting phases during which a scalar field is displaced in its potential and consequently establishing the initial conditions for standard slow-roll inflation. We will also compute the power spectrum of the perturbed scalar field generated during the super-inflationary phases of the universe and show that it can be scale invariant and that the horizon problem is solved with only a few e-folds of super-inflationary expansion. The talk is purely phenomenological and knowledge of LQC is not necessary. |
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lundi 17 septembre 2007 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
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