NEBRIC

Non-linear effects and backreaction in classical and quantum cosmology

Coordinatore	UNIVERSITE DE GENEVE    more  Organization address address: Rue du General Dufour 24 city: GENEVE postcode: 1211 contact info Titolo: Prof. Nome: Ruth Cognome: Durrer Email: send email Telefono: +41 223796884 Fax: +41 223796870
Nazionalità Coordinatore	Switzerland [CH]
Totale costo	248˙451 €
EC contributo	248˙451 €
Programma	FP7-PEOPLE Specific programme "People" implementing the Seventh Framework Programme of the European Community for research, technological development and demonstration activities (2007 to 2013)
Code Call	FP7-PEOPLE-2011-IEF
Funding Scheme	MC-IEF
Anno di inizio	2012
Periodo (anno-mese-giorno)	2012-09-01   -   2015-08-31

 Partecipanti

#	participant	country	role	EC contrib. [€]
1	UNIVERSITE DE GENEVE  Organization address address: Rue du General Dufour 24 city: GENEVE postcode: 1211 contact info Titolo: Prof. Nome: Ruth Cognome: Durrer Email: send email Telefono: +41 223796884 Fax: +41 223796870	CH (GENEVE)	coordinator	248˙451.40

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 Obiettivo del progetto (Objective)

'Cosmology has gone through an amazing revolution during the last decade owing to the large amount of new precise observational data. These data strongly indicate the existence of two periods of accelerated expansion in the history of the Universe. One in the primordial universe, the so-called inflationary phase, and one at the present era. The link between data and models is made mostly by linear perturbation theory on a spatially homogeneous and isotropic Friedmann Universe. But beyond linear order many interesting effects appear, such as the non-Gaussianity, that should be present in the CMB, and backreaction (BR) effects. In particular, quantum BR of primordial fluctuations can significantly modify the dynamics of the early universe and its observational signatures, while classical BR of large scale structure (LSS) might contribute to the observed late time acceleration. The goal of my project is to quantify these non-linear effects more precisely. First, I want to connect the BR of the LSS to observations using a light-cone averaging prescription. Then, I want to evaluate BR effects from magnetic fields generated during inflation in a consistent way both using the effective equation for the cosmological backreaction and the data inside the backward light-cone of a physical observer. I also plan to obtain observational bounds on BR from the study of the effective equation of state it induces and from its effect on early phases of expansion, from preheating to CMB decoupling passing through the relativistic era that takes place before the Big-bang nucleosynthesis. Also an alternative approach compared to the BR of the LSS will be then considered, I will investigate how a smooth expand Universe can be obtained from small, static inhomogeneous cells that are glued together. This possibility is more challenging and almost unexplored. Finally, I want to investigate how non-Gaussianity (and other observables) can change as consequences of the loop corrections.'