期刊
PHYSICAL REVIEW D
卷 83, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.83.023528
关键词
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资金
- Gates Cambridge Trust
- Science and Technology Facilities Council [ST/F002998/1] Funding Source: researchfish
- STFC [ST/F002998/1] Funding Source: UKRI
We examine the evolution of a universe comprising two fluids which interact via a term proportional to the product of their densities. In the case of two matter fluids, it is shown that the ratio of the densities tends to a constant after an initial cooling-off period. We then obtain a complete solution for the cosmological constant (w = -1) scenario and show that periodic solutions can occur if w < -1. We further demonstrate that the ratio of the dark matter and dark energy densities is confined to a bounded interval and that this ratio can be O(1) at infinitely many times in the history of the universe, thus solving the coincidence problem. Finally, we show that, for a certain choice of parameters, the model is a viable fit to observational constraints, and we give a detailed discussion of the past and future evolution of the universe in this particular case.
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