COM2 - Dark Energy and Universe Acceleration |
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Speaker |
Lima, J. Ademir |
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Co-autors |
R. F. L. Holanda, J. V. Cunha |
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Talk Title |
Acessing the Acceleration of the Universe with Sunyaev-Zeldovich and X-ray data from Galaxy Clusters |
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Abstract |
A kinematic method to access cosmic acceleration based exclusively on the Sunyaev-Zel'dovich effect (SZE) and X-ray surface brightness data from galaxy clusters is proposed. By using the SZE/X-ray data from 38 galaxy clusters [Bonamente et al. 2006] we find that the present Universe is accelerating and that the transition from an earlier decelerating to a late time accelerating regime occurred relatively recent. Such results are fully independent on the validity of any metric gravity theory, the possible matter-energy contents filling the Universe, as well as on the SNe Ia Hubble diagram from which the presenting accelerating stage was inferred. The ability of the ongoing Planck satellite mission to obtain tighter constraints on the expansion history through SZE/X-ray angular diameters is also discussed. It is argued that such a technique will be competitive with supernova data besides being complementary to it. |
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