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- W1999192875 abstract "We compare the WMAP temperature power spectrum and SNIa data to models with a generalized Chaplygin gas as dark energy. The generalized Chaplygin gas is a component with an exotic equation of state, pX = −A/ραX (a polytropic gas with negative constant and exponent). Our main result is that, restricting to a flat universe and to adiabatic pressure perturbations for the generalized Chaplygin gas, the constraints at 95% CL to the present equation of state wX = pX/ρX and to the parameter α are −1 ≤ wX < −0.8, 0 ≤ α < 0.2, respectively. Moreover, we show that a Chaplygin gas (α = 1) is ruled out as a candidate for dark energy by our analysis at more than the 99.99% CL. A generalized Chaplygin gas appears much less likely as a unified dark matter candidate (ΩCDM = 0) than as a dark energy model, although its χ2 is only two sigma away from the expected value." @default.
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- W1999192875 date "2003-07-08" @default.
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- W1999192875 title "WMAP and the generalized Chaplygin gas" @default.
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- W1999192875 doi "https://doi.org/10.1088/1475-7516/2003/07/005" @default.
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