Dark energy, matter creation and curvature

作者：Cardenas Victor H^*

来源：European Physical Journal C, 2012, 72(9): 2149.

DOI：10.1140/epjc/s10052-012-2149-0

The most studied way to explain the current accelerated expansion of the universe is to assume the existence of dark energy; a new component that fills the universe, does not form clumps, currently dominates the evolution, and has a negative pressure. In this work I study an alternative model proposed by Lima et al. (Abramo and Lima in Class. Quantum Gravity 13: 2953, 1996; Zimdahl in Phys. Rev. D 53: 5483, 1996; Zimdahl and Pavon in Mon. Not. R. Astron. Soc. 266: 872, 1994), which does not need an exotic equation of state, but assumes instead the existence of gravitational particle creation. Because this model fits the supernova observations as well as the Lambda CDM model, I perform in this work a thorough study of this model, considering an explicit spatial curvature. I found that in this scenario we can alleviate the cosmic coincidence problem, basically showing that these two components, dark matter and dark energy, are of the same nature, but they act at different scales. I also shown the inadequacy of some particle creation models, and I study a previously proposed new model that overcomes these difficulties.

• 出版日期2012-9