MG15 - Talk detail

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Abstract

So far large and different data sets revealed the accelerated expansion rate of the Universe, which is usually assumed to be driven by the so called dark energy, that, according to recent estimates, provides about 70% of the total amount of the matter- energy in the Universe. The nature of dark energy is yet unknown. Whatever future data discover, the simple plot of the Hubble diagram (HD) as a function of redshift will remain one of the primary tool for cosmological investigations, as the conversion between redshift and distance depends on the specific parameters of the underlying models. We show that different dark energy models can be tested, by using a high redshift GRBS HD, obtained calibrating the Ep,i- Eiso correlation in long GRBs. It turns out that the Cosmological Constant model is not favored by the present data.

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