Smooth Energy: Cosmological Constant or Quintessence?
| Autor: | Matts Roos, Sidney A. Bludman |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Physics
010308 nuclear & particles physics Conditional probability Shape of the universe Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Cosmological constant 01 natural sciences Galaxy Theoretical physics Space and Planetary Science 0103 physical sciences Prior probability Range (statistics) 010303 astronomy & astrophysics Anthropic principle Quintessence |
| Zdroj: | The Astrophysical Journal. 547:77-81 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/318340 |
| Popis: | For a flat universe presently dominated by smooth energy, either cosmological constant (LCDM) or quintessence (QCDM), we calculate the asymptotic collapsed mass fraction as a function of the present ratio of smooth energy to matter energy, 0. Identifying the normalized collapsed fraction as a conditional probability for habitable galaxies, we observe that the observed present ratio 0 ~ 2 is likely in LCDM, but more likely in QCDM. Inverse application of Bayes's theorem makes the anthropic principle a predictive scientific principle: the data imply that the prior probability for 0 must be essentially flat over the anthropically allowed range. Interpreting this prior as a distribution over theories lets us predict that any future theory of initial conditions must be indifferent to 0. This application of the anthropic principle does not demand the existence of other universes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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