Perturbations in the relaxation mechanism for a large cosmological constant
General Relativity and Quantum Cosmology
2010-02-17 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
High Energy Physics - Theory
Abstract
Recently, a mechanism for relaxing a large cosmological constant (CC) has been proposed [arxiv:0902.2215], which permits solutions with low Hubble rates at late times without fine-tuning. The setup is implemented in the LXCDM framework, and we found a reasonable cosmological background evolution similar to the LCDM model with a fine-tuned CC. In this work we analyse analytically the perturbations in this relaxation model, and we show that their evolution is also similar to the LCDM model, especially in the matter era. Some tracking properties of the vacuum energy are discussed, too.
Keywords
Cite
@article{arxiv.0909.2237,
title = {Perturbations in the relaxation mechanism for a large cosmological constant},
author = {Florian Bauer},
journal= {arXiv preprint arXiv:0909.2237},
year = {2010}
}
Comments
18 pages, LaTeX; discussion improved, accepted by CQG