Predictions of the causal entropic principle for environmental conditions of the universe

Details Predictions of the causal entropic principle for environmental conditions of the universe Predictions of the causal entropic principle for environmental conditions of the universe

2007-09-27

arxiv.org/abs/0709.4443v2

Phys.Rev.D77:063520,2008

Physics

High Energy Physics

High Energy Physics - Theory

RevTeX4, 13pp, 10 figures; v2. clarified introduction, added refs

Scientific paper

10.1103/PhysRevD.77.063520

The causal entropic principle has been proposed as a superior alternative to the anthropic principle for understanding the magnitude of the cosmological constant. In this approach, the probability to create observers is assumed to be proportional to the entropy production \Delta S in a maximal causally connected region -- the causal diamond. We improve on the original treatment by better quantifying the entropy production due to stars, using an analytic model for the star formation history which accurately accounts for changes in cosmological parameters. We calculate the dependence of \Delta S on the density contrast Q=\delta\rho/\rho, and find that our universe is much closer to the most probable value of Q than in the usual anthropic approach and that probabilities are relatively weakly dependent on this amplitude. In addition, we make first estimates of the dependence of \Delta S on the baryon fraction and overall matter abundance. Finally, we also explore the possibility that decays of dark matter, suggested by various observed gamma ray excesses, might produce a comparable amount of entropy to stars.

Affiliated with

Also associated with

No associations

Rating

Predictions of the causal entropic principle for environmental conditions of the universe 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 Predictions of the causal entropic principle for environmental conditions of the universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Predictions of the causal entropic principle for environmental conditions of the universe will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-482342