Anthropic versus cosmological solutions to the coincidence problem

作者：Barreira A^*; Avelino P P

来源：Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, 83(10): 103001.

DOI：10.1103/PhysRevD.83.103001

In this paper, we investigate possible solutions to the coincidence problem in flat phantom dark-energy models with a constant dark-energy equation of state and quintessence models with a linear scalar field potential. These models are representative of a broader class of cosmological scenarios in which the universe has a finite lifetime. We show that, in the absence of anthropic constraints, including a prior probability for the models inversely proportional to the total lifetime of the universe excludes models very close to the Lambda cold dark matter model. This relates a cosmological solution to the coincidence problem with a dynamical dark-energy component having an equation-of-state parameter not too close to -1 at the present time. We further show that anthropic constraints, if they are sufficiently stringent, may solve the coincidence problem without the need for dynamical dark energy.

• 出版日期2011-5-9