Cosmological Consequences of a Variable Cosmological Constant Model

Autor:	Azri, Hemza, Bounames, A.
Rok vydání:	2014
Předmět:	General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory
Zdroj:	Int. J. Mod. Phys. D 26, 1750060 (2017)
Druh dokumentu:	Working Paper
DOI:	10.1142/S0218271817500602
Popis:	We derive a model of dark energy which evolves with time via the scale factor. The equation of state $\omega=(1-2\alpha)/(1+2\alpha)$ is studied as a function of a parameter $\alpha$ introduced in this model. In addition to the recent accelerated expansion, the model predicts another decelerated phase. The age of the universe is found to be almost consistent with observation. In the limiting case, the cosmological constant model, we find that vacuum energy gravitates with a gravitational strength, different than Newton's constant. This enables degravitation of the vacuum energy which in turn produces the tiny observed curvature, rather than a 120 orders of magnitude larger value. Comment: Accepted in Int. J. Mod. Phys. D
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1412.7567 Zobrazit plný text záznamu View this record from Arxiv