Evolution of cosmological constant in effective gravity

Details Evolution of cosmological constant in effective gravity Evolution of cosmological constant in effective gravity

2003-02-17

arxiv.org/abs/gr-qc/0302069v2

Pisma Zh.Eksp.Teor.Fiz. 77 (2003) 407-411; JETP Lett. 77 (2003) 339-343

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTeX file, 5 pages, no figures, version submitted to JETP Letters

Scientific paper

10.1134/1.1581956

In contrast to the phenomenon of nullification of the cosmological constant in the equilibrium vacuum, which is the general property of any quantum vacuum, there are many options in modifying the Einstein equation to allow the cosmological constant to evolve in a non-equilibrium vacuum. An attempt is made to extend the Einstein equation in the direction suggested by the condensed-matter analogy of the quantum vacuum. Different scenarios are found depending on the behavior of and the relation between the relaxation parameters involved, some of these scenarios having been discussed in the literature. One of them reproduces the scenario in which the effective cosmological constant emerges as a constant of integration. The second one describes the situation, when after the cosmological phase transition the cosmological constant drops from zero to the negative value; this scenario describes the relaxation from this big negative value back to zero and then to a small positive value. In the third example the relaxation time is not a constant but depends on matter; this scenario demonstrates that the vacuum energy (or its fraction) can play the role of the cold dark matter.

Affiliated with

Also associated with

No associations

Rating

Evolution of cosmological constant in effective gravity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Evolution of cosmological constant in effective gravity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evolution of cosmological constant in effective gravity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-381269