Singularities in cosmologies with interacting fluids

详细信息	查看全文 | 推荐本文 |

• 作者：Spiros Cotsakis ; ^{skot@aegean.gr} ; Georgia Kittou ^{gkittou@aegean.gr}
• 刊名：Physics Letters B
• 出版年：2012
• 期刊代码：58_03702693
• 类别：ph
• 出版时间：30 May, 2012
• 卷：712
• 期：1-2
• 页码：16-21
• 文件大小：168 K

摘要

We study the dynamics near finite-time singularities of flat isotropic universes filled with two interacting but otherwise arbitrary perfect fluids. The overall dynamical picture reveals a variety of asymptotic solutions valid locally around the spacetime singularity. We find the attractor of all solutions with standard decay, and for 鈥榩hantom鈥?matter asymptotically at early times. We give a number of special asymptotic solutions describing universes collapsing to zero size and others ending at a big rip singularity. We also find a very complicated singularity corresponding to a logarithmic branch point that resembles a cyclic universe, and give an asymptotic local series representation of the general solution in the neighborhood of infinity.