On the trail of dark energy

Details On the trail of dark energy On the trail of dark energy

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009nuphs.194..245j&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 194, p. 245-253.

Physics

Nuclear Physics

Scientific paper

I present some recent results on efforts to constraint the variation of dark energy as a function of redshift. In particular I concentrate on observational determinations of the expansion history H(z). I review a formalism that makes use of quantities similar to the Horizon-flow parameters in inflation and is general enough that can deal with multiscalar quintessence scenarios, exotic matter components, and higher order curvature corrections to General Relativity. I show how the shape of the dark energy potential can be recovered non parametrically using this formalism and I present approximations analogous to the ones relevant to slow-roll inflation. Since presently available data do not allow a non-parametric and exact reconstruction of the potential, I consider a general parametric description. This reconstruction can also be used in other approaches followed in the literature (e.g., the reconstruction of the redshift evolution of the dark energy equation of state w(z)). Using observations of passively evolving galaxies and supernova data I derive constraints on the dark energy potential shape in the redshift range 0.1

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