期刊
INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS
卷 20, 期 -, 页码 19-26出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218301311040037
关键词
Anisotropic Cosmology; Phase Space
We construct general anisotropic cosmological scenarios governed by an f(R) = R-n gravitational sector. Focusing then on some specific geometries, and modelling the matter content as a perfect fluid, we perform a phase-space analysis. We analyze the possibility of accelerating expansion at late times, and additionally, we determine conditions for the parameter n for the existence of phantom behavior, contracting solutions as well as of cyclic cosmology. Furthermore, we analyze if the universe evolves towards the future isotropization without relying on a cosmic no-hair theorem. Our results indicate that anisotropic geometries in modified gravitational frameworks present radically different cosmological behaviors compared to the simple isotropic scenarios.
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