Author:
Sinha Srijita,Banerjee Narayan
Abstract
Abstract
In the era of precision cosmology, the cosmological constant Λ gives quite an accurate description of the evolution of the Universe, but it is still plagued with the fine-tuning problem and the cosmic coincidence problem. In this work, we investigate the perturbations in a scalar field model that drives the recent acceleration in a similar fashion that the cosmological constant does and has the dark energy (DE) density comparable to the dark matter (DM) energy density at the recent epoch starting from arbitrary initial conditions. The perturbations show that this model, though it keeps the virtues of a ΛCDM model, has a distinctive qualitative feature, particularly it reduces the amplitude of the matter power spectrum on a scale of 8 h-1 Mpc, σ8 at the present epoch.
Subject
Astronomy and Astrophysics
Cited by
19 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献