Talk detail

Participant	Stahl, Clément
Institution	Valparaiso U., Catolica - Casilla 4950 - Valparaíso - - Chile

Session	SF1	Accepted	Yes	Order	8	Time	17:55	20'
Talk	Oral abstract	Title	Schwinger effect impacting primordial magnetogenesis?
Coauthors
Abstract	We explore the enhancement of an electromagnetic field in an inflationary background with an anti-conductive plasma of scalar particles. The possibility of a negative conductivity was recently put forward in the context of the renormalization of the Schwinger induced current in de Sitter spacetime. While a negative conductivity enhances the produced magnetic field, we find that it is too weak to seed the observed intergalactic magnetic field today. This results on pair creation in inflationary scenario is however important for primordial scenarios of magnetogenesis as the presence of a conductivity alters the spectral index of the magnetic field
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Session	DE2	Accepted	Yes	Order	1	Time	15:15	30'
Talk	Oral abstract	Title	Relativistic corrections to large scale structures
Coauthors	Castiblanco, Lina ; Noreña, Jorge ; Gannouji, Radouane
Abstract	We investigate the relativistic corrections to the standard model of formation of large scale structures. In matter domination and in the Poisson gauge, we use the weak-field approximation which allows to keep compact expressions even for the one-loop bispectrum. Whereas in the Newtonian limit, the choice of gauge is marginally important as all gauge coincides, when relativistic corrections are taken into account, it matters as a change of gauge may induce a change of gravitational potential and introduce fictitious modes in the finial result for the power spectrum. It is precisely what happens in the example presented in this talk as the equivalence principle is not fulfilled in the Poisson gauge and the cancellation of the IR divergence at one-loop does not occur. We will discuss how other choices of gauge may solve this issue.
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