Alternative dark energies with atypical sound speeds

✍ Scribed by Rachel Bean; Olivier Doré

• Book ID: 104067272
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 263 KB
• Volume: 47
• Category: Article
• ISSN: 1387-6473
• DOI: 10.1016/j.newar.2003.07.003

✦ Synopsis

We study the implications on both background and perturbation evolution of introducing a Chaplygin gas component in the universeÕs ingredients. We perform likelihood analyses using wide-ranging, SN1a, CMB and large scale structure observations to assess whether such a component could be a genuine alternative to a cosmological constant, K. We find that the current data favors behavior in an adiabatic Chaplygin gas that is akin to a cosmological constant.