Statut  Confirmé 
Série  APCTH 
Domaines  hepth 
Date  Mardi 19 Septembre 2017 
Heure  14:00 
Institut  APC 
Salle  483A  Malevitch 
Nom de l'orateur  Vennin 
Prenom de l'orateur  Vincent 
Addresse email de l'orateur  
Institution de l'orateur  APC 
Titre  Stochastic Inflation and Primordial Black Holes 
Résumé  In the inflationary paradigm, the transition from quantum fluctuations to classical but stochastic density perturbations plays an important role. In particular, it implies that the open quantum system comprising the superHubble degrees of freedom can be described with a classical stochastic theory, the “stochastic inflation” formalism. In this framework, the shortwavelength quantum fluctuations act as a classical noise on the dynamics of the superHubble scales. I will explain which quantum backreaction signatures are left by this effect on the correlation functions of primordial cosmological perturbations. I will discuss the conditions under which these can be large even at subPlanckian energy, and I will explain which prospects it opens for probing quantum gravity effects on inflationary dynamics. As an application, I will show how the formation of primordial black holes formation from inflation is dominated by these stochastic effects. 
Numéro de preprint arXiv  
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