Mathematics – Logic
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...62l&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 62-63
Mathematics
Logic
Scientific paper
The equation of state characterizing the dark energy component is constrained by combining Chandra observations of the X-ray luminosity of galaxy clusters with independent measurements of the baryonic matter density and the latest measurements of the Hubble parameter as given by the Hubble Space Telescope key project. By assuming a spatially flat scenario driven by a "quintessence" component with an equation of state px = wrx we place the following limits on the cosmological parameters w and Wm: (i) -1 £ w £ -0.55 and Wm = 0.32+0.027-0.014 (1s) if the equation of state of the dark energy is restricted to the interval -1 £ w < 0 (usual quintessence) and (ii) w = -1.29+0.686-0.792 and Wm = 0.31+0.037-0.034 (1s) if w violates the null energy condition and assume values < -1 (extended quintessence or "phantom" energy). Different constraints are obtained whether the dark energy is modeled by a generalized Chaplygin gas. In this case, the basic cosmological parameters have been constrained through a joint analysis using X-Ray and SN Ia data.
Alcaniz Jailson S.
Cunha V. Jr. J.
Lima A. S. J.
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