Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/12374
 Title: Testable anthropic predictions for dark energy Author: Garriga Torres, JaumeVilenkin, A. (Alexander) Keywords: Energia fosca (Astronomia)Ecuacions d'estatCosmologiaDark energy (Astronomy)Equations of stateCosmology Issue Date: 2003 Publisher: The American Physical Society Abstract: In the context of models where the dark energy density $\rD$ is a random variable, anthropic selection effects may explain both the "old" cosmological constant problem and the "time coincidence". We argue that this type of solution to both cosmological constant problems entails a number of definite predictions, which can be checked against upcoming observations. In particular, in models where the dark energy density is a discrete variable, or where it is a continuous variable due to the potential energy of a single scalar field, the anthropic approach predicts that the dark energy equation of state is $p_D=-\rho_D$ with a very high accuracy. It is also predicted that the dark energy density is greater than the currently favored value $\Omega_D\approx 0.7$. Another prediction, which may be testable with an improved understanding of galactic properties, is that the conditions for civilizations to emerge arise mostly in galaxies completing their formation at low redshift, $z\approx 1$. Finally, there is a prediction which may not be easy to test observationally: our part of the universe is going to recollapse eventually. However, the simplest models predict that it will take more than a trillion years of accelerated expansion before this happens. Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevD.67.043503 It is part of: Physical Review D, 2003, vol. 67, núm. 4, p. 043503-1-043503-11 Related resource: http://doi.org/10.1103/PhysRevD.67.043503 URI: http://hdl.handle.net/2445/12374 ISSN: 0556-2821 Appears in Collections: Articles publicats en revistes (Física de la Matèria Condensada)

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