Theoretical Cosmology meetings

To actively encourage the field of theoretical cosmology and to set an informal stage for the exchange of ideas, the Dutch theoretical cosmology community organizes Friday afternoon meetings approximately 6 times a year — usually on the first Friday of the month. The meetings typically start in the afternoon with a main speaker, followed by a short break to continue with another seminar or journal club discussion on some topic of current interest. We end the afternoon with drinks. The supporting institutes in Leiden, Amsterdam, Groningen, Utrecht where recently joined by the strings and cosmology group in Leuven and take turns in hosting the event.

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Groningen Spring 2016

13/05/2016 @ 12:00 - 18:00

Date: Friday, May 13, 2016

Location: Rijksuniversiteit Groningen (downtown), Faculty of Law building (next to the Harmonie building, entrance in the Uurwerksgang), room T01


12:00 Talk by David Marsh (Cambridge)
Title: Simple emergent power spectra from complex inflationary physics
Abstract: The primordial perturbations inferred from observations of the Cosmic Microwave Background and the large-scale structure of the universe are quite simple, to a good approximation Gaussian and approximately scale-invariant, and consistent with some of the simplest models of single-field slow-roll inflation. Embeddings of inflation in string theory however tend to be rather complex, involving many fields (moduli and axions) with complicated interactions. Unfortunately, constructing explicit models of inflation with many fields is computationally very challenging, and not much is known about the observational predictions of complex many-field models of inflation.  In this talk, I will report on some recent advances on this problem: using techniques from non-equilibrium random matrix theory, ensembles of complicated inflationary models with many fields can be constructed, and their observational predictions computed. Strikingly, as the number of interacting fields (and hence the complexity of the model) increases, the power spectra of curvature perturbations simplify, and become more predictive. I will explain how these results can be understood in terms of universal properties of large, random matrices.

13:00 lunch (not provided)

14:00 Talk by Alessandra Silvestri (Leiden)

Title: Parametrized approaches to modified gravity

Abstract: I will focus on the challenge posed by cosmic acceleration and discuss theoretical issues involved in finding an optimal framework to  test gravity on cosmological scales with upcoming high precision measurements of the large scale structure. I will give an overview or recent progress and in particular discuss in detail the practical aspects of the effective field theory approach to dark energy and its implementation in CAMB.

15:00 coffee (provided )

 15.30 Talk by Remko Klein (Groningen)
Title: Towards the most general scalar-tensor theory


12:00 - 18:00
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Rijksuniversiteit Groningen
Groningen, Groningen 9712 EK Netherlands
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