Perturbations in the relaxation mechanism for a large cosmological constant

Details Perturbations in the relaxation mechanism for a large cosmological constant Perturbations in the relaxation mechanism for a large cosmological constant

2009-09-11

arxiv.org/abs/0909.2237v2

Class.Quant.Grav.27:055001,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

18 pages, LaTeX; discussion improved, accepted by CQG

Scientific paper

10.1088/0264-9381/27/5/055001

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.

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