期刊
PHYSICS LETTERS B
卷 689, 期 1, 页码 1-7出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2010.04.038
关键词
Singularity with finite value of scale factor; Brane; Scalar field; Tachyon potential
资金
- Russian Foundation for Basic Research [08-02-91307-INDa, 09-05-00446a]
- European Science Foundation (ESF) [FIS2006-02842]
We use a method of linearization to study the emergence of the future cosmological singularity characterized by finite value of the cosmological radius. We uncover such singularities that keep Hubble parameter finite while making all higher derivatives of the scale factor (starting out from the a) diverge as the cosmological singularity is approached. Since such singularities has been obtained before in the brane world model we name them the brane-like singularities. These singularities can occur during the expanding phase in usual Friedmann universe filled with both a self-acting, minimally coupled scalar field and a homogeneous tachyon field. We discover a new type of finite-time, future singularity which is different from type I-IV cosmological singularities in that it has the scale factor, pressure and density finite and nonzero. The generalization of w-singularity is obtained as well. (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据