Theoretical cosmology meeting

10Nov2017 14:00 - 17:00

Event

Speakers: William Cottrell (UvA) and Vincent Vennin (APC, Paris & Portsmouth U., ICG). Location: Nikhef, Amsterdam

Programme

14:00-15:00  William Cottrell (UvA)

Weak Gravity Constraints in Inflation 

15:00 – 15:30 Coffee

15:30-16:30 Vincent Vennin (APC, Paris & Portsmouth U., ICG) 

Stochastic Inflation and Primordial Black Holes 

16:30 Drinks/Borrel

Abstracts 

William Cottrell (UvA) 

Weak Gravity Constraints in Inflation

Abstract: In this talk I will summarize constraints that the axionic form of the Weak Gravity Conjecture places on inflation models and attempts to circumvent these constraints. I will also discuss applications of the Weak Gravity Conjecture to monodromy models.

Vincent Vennin (APC, Paris & Portsmouth U., ICG) 

Stochastic Inflation and Primordial Black Holes

Abstract: 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 super-Hubble degrees of freedom can be described with a classical stochastic theory, the “stochastic inflation” formalism.In this framework, the short-wavelength quantum fluctuations act as a classical noise on the dynamics of the super-Hubble scales.

I will explain which signatures are left by this quantum backreaction on the correlation functions of primordial cosmological perturbations. I will discuss the conditions under which these can be large even at sub-Planckian 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 from inflation is dominated by these stochastic effects.

Location

Nikhef, room H331, Science Park 105, Amsterdam

Website: http://www.nikhef.nl

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source: THC@NL

Published by  D-ITP