Status: Bibliographieeintrag
Standort: ---
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| Online-Ressource |
Verfasst von: | Amendola, Luca [VerfasserIn]  |
Titel: | WMAP and the generalized Chaplygin gas |
Verf.angabe: | L. Amendola, F. Finelli, C. Burigana, and D. Carturan |
Fussnoten: | Gesehen am 17.11.2017 |
Titel Quelle: | Enthalten in: De.arxiv.org |
Jahr Quelle: | 2003 |
Band/Heft Quelle: | (2003) Artikel-Nummer 0304325, 10 Seiten |
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, p_X=-A/\rho^\alpha_X (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 w_X = p_X / \rho_X and to the parameter \alpha are -1\leq w_X < -0.8, 0 \leq \alpha <0.2, respectively. Moreover, we show that a Chaplygin gas (\alpha =1) as a candidate for dark energy is ruled out by our analysis at more than the 99.99% CL. A generalized Chaplygin gas as a unified dark matter candidate (\Omega_{CDM}=0) appears much less likely than as a dark energy model, although its \chi^2 is only two sigma away from the expected value. |
URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Kostenfrei: Verlag: http://arxiv.org/abs/astro-ph/0304325 |
Datenträger: | Online-Ressource |
Sprache: | eng |
K10plus-PPN: | 1565449452 |
Verknüpfungen: | → Sammelwerk |
WMAP and the generalized Chaplygin gas / Amendola, Luca [VerfasserIn] (Online-Ressource)
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