Inverse volume corrections to emergent tachyonic inflation in loop quantum cosmology

被引:18
作者
Wu, Puxun [1 ,2 ,3 ,4 ]
Zhang, Shuang Nan [1 ,2 ,5 ,6 ]
Yu, Hongwei [3 ,4 ]
机构
[1] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
[3] Hunan Normal Univ, Dept Phys, Changsha 410081, Hunan, Peoples R China
[4] Hunan Normal Univ, Inst Phys, Changsha 410081, Hunan, Peoples R China
[5] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
[6] Univ Alabama, Dept Phys, Huntsville, AL 35899 USA
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
physics of the early universe; quantum gravity phenomenology; cosmic singularity; inflation; GRAVITY; UNIVERSE; GEOMETRY; ENTROPY;
D O I
10.1088/1475-7516/2009/05/007
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The emergent model in the context of loop quantum cosmology with a tachyon scalar field is studied. We find that there is a center equilibrium point in the semiclassical region and a saddle point in the classical region. If the potential of the tachyon field satisfies some conditions, the universe can stay at the center equilibrium point past-eternally and then oscillate infinitely around this point with the tachyon climbing up its potential. Once the potential reaches a critical value, these two equilibrium points coincide with each other and the oscillation phase is broken by an emergent inflation. In order to obtain a successful emergent tachyon inflation, a constraint on. (phi) over dot(2) of tachyon is required.
引用
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页数:10
相关论文
共 72 条
[61]  
SINGH P, ARXIV09012750SPIRES
[62]   A cyclic model of the universe [J].
Steinhardt, PJ ;
Turok, N .
SCIENCE, 2002, 296 (5572) :1436-1439
[63]   Cosmic evolution in a cyclic universe [J].
Steinhardt, PJ ;
Turok, N .
PHYSICAL REVIEW D, 2002, 65 (12)
[64]  
Thiemann T, 2007, LECT NOTES PHYS, V721, P185, DOI 10.1007/978-3-540-71117-9_10
[65]  
Thiemann T, 2003, LECT NOTES PHYS, V631, P41
[66]   Hamiltonian constraint of loop quantum cosmology [J].
Vandersloot, K .
PHYSICAL REVIEW D, 2005, 71 (10)
[67]   Loop quantum cosmology and the k = -1 Robertson-Walker model [J].
Vandersloot, Kevin .
PHYSICAL REVIEW D, 2007, 75 (02)
[68]   Dynamics of quintom and hessence energies in loop quantum cosmology [J].
Wei, Hao ;
Zhang, Shuang Nan .
PHYSICAL REVIEW D, 2007, 76 (06)
[69]   Cosmological evolution of the interacting phantom (quintessence) model in loop quantum gravity [J].
Wu, Puxun ;
Zhang, Shuang Nan .
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2008, (06)
[70]   Tachyon field in loop quantum cosmology: Inflation and evolution picture [J].
Xiong, Hua-Hui ;
Zhu, Jian-Yang .
PHYSICAL REVIEW D, 2007, 75 (08)