Bouncing and accelerating solutions in nonlocal stringy models

被引：83

作者：

Aref'eva, Irina Ya ^{[1
]}

Joukovskaya, Liudmila V. ^{[1
,2
]}

Vernov, Sergey Yu ^{[3
]}

机构：

[1] Russian Acad Sci, Steklov Math Inst, Gubkin 8, Moscow 119991, Russia

[2] Univ Cambridge, Ctr Math Sci, DAMTP, Cambridge CB3 0WA, England

[3] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2007年 / 07期

关键词：

cosmology of theories beyond the SM; string field theory;

D O I：

10.1088/1126-6708/2007/07/087

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A general class of cosmological models driven by a nonlocal scalar field inspired by string field theories is studied. In particular cases the scalar field is a string dilaton or a string tachyon. A distinguished feature of these models is a crossing of the phantom divide. We reveal the nature of this phenomena showing that it is caused by an equivalence of the initial nonlocal model to a model with an infinite number of local fields some of which are ghosts. Deformations of the model that admit exact solutions are constructed. These deformations contain locking potentials that stabilize solutions. Bouncing and accelerating solutions are presented.

引用

页数：36

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