spring workshop on gravity and cosmology

Session

Inflation and PBH (III)

17 May 2019, 09:00

2.46 (faculty of physics)

Conveners

Inflation and PBH (III)

• Krzysztof Turzynski (University of Warsaw)

12. Numerical simulation of Primordial Black Holes

Albert Escrivà

17/05/2019, 09:00

In this talk I will present a fast and new procedure to calculate the averaged mass excess threshold δc of primordial black holes from a given cosmological perturbation profile using pseudo-spectral methods, numerically solving the Misner-Sharp equations. I apply the method in the cosmological context to put constraints on the inflationary power spectrum.

10. Primordial Black Holes abundance

Cristiano Germani

17/05/2019, 09:30

In this talk I will discuss how to calculate the abundance of primordial black holes given an inflationary power spectrum

13. Failure of the stochastic approach to inflation beyond slow-roll

Diego Cruces (ICC. UB)

17/05/2019, 10:45

After giving a pedagogical review I will clarify that the stochastic approach to inflation is generically reliable only at zeroth order in the (geometrical) slow-roll parameter ϵ_1 if and only if ϵ2_2≪6/ϵ_1, with the notable exception of slow-roll. This is due to the failure of the stochastic ΔN formalism in its standard formulation. However, by keeping the formalism in its regime of validity,...

8. Inflationary correlators from the stochastic spectral expansion

Mr Tommi Markkanen

17/05/2019, 11:15

Continuing on the topic of the stochastic formalism, in this talk I will present the lesser known stochastic spectral expansion and show how it can be used to calculate correlation functions generated during inflation. I also discuss the shortcomings of some of the commonly used approximations and present the full stochastic calculation for the isocurvature spectrum of a decoupled spectator,...

14. free discussion

17/05/2019, 12:00

15. Properties of the primordial power spectrum for PBH production

Ioannis Dalianis ( NTU Athens)

17/05/2019, 14:00

I will discuss the properties of the primordial power spectrum so that PBHs are produced in accordance with the constraints coming from the CMB and BBN observables. I will mainly focus on the large wavenumbers of the power spectrum where, if there is a peak, PBH with sub-solar masses are generated. Then I will describe the scenario that the dark matter in the universe is comprised either of...

16. Oscillations that mimick weak lensing

Guillem Domenech (uni. heidelberg)

17/05/2019, 15:15

The latest Planck’s analysis of the power spectrum finds 10% more lensing smoothing than predicted by LCDM at 2 sigma. If it is not a statistical fluke, it could indicate new physics that mimick the smoothing effect of lensing. What could that be and how was generated? First, I will show you that oscillations in the primordial power spectrum with the same frequency as the acoustic peaks but...

17. free discussion

17/05/2019, 16:00