MG13 - Talk detail |
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Participant |
Demianski, Marek | |||||||
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Institution |
Institute of Theoretical Physics, Faculty of Physics, University of Warsaw - Hoza 69 - Warsaw - Poland - Poland | |||||||
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Session |
OC3 |
Accepted |
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Order |
Time |
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Talk |
Oral abstract |
Title |
High redshift cosmography: new results and implications for dark energy | |||||
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Abstract |
We use all the available date on high redshift objects (Union2 Type Ia supernovae, GRBs and BAO) to derive constrains on the parameters of FRWL cosmological model without imposing any a priori assumptions about on the dynamical equations for gravity. These data sets allow us to put constrains on the cosmographic expansion up to the fifth order. To perform our analysis we use the Markov Chain Monte Carlo Method. To investigate the dark energy component we use different parametrizations of its equation of state. We show that the deceleration parameter clearly confirms the present acceleration phase of the Universe, there are hints that the dark energy equation of state is evolving and there are possible deviations from the LCDM model. |
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