Scale invariance without inflation? -: art. no. 002

被引:33
作者
Armendáriz-Picón, C
Lim, EA
机构
[1] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA
[2] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA
[3] Univ Chicago, Ctr Cosmol Phys, Chicago, IL 60637 USA
来源
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2003年 / 12期
关键词
cosmological perturbation theory; inflation;
D O I
10.1088/1475-7516/2003/12/002
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We propose a new alternative mechanism to seed a scale invariant spectrum of primordial density perturbations that does not rely on inflation. In our scenario, a perfect fluid dominates the early stages of an expanding, non-inflating universe. Because the speed of sound of the fluid decays, perturbations are left frozen behind the sound horizon, with a spectral index that depends on the fluid equation of state. We explore here a toy model that realizes this idea. Although the model can explain an adiabatic, Gaussian, scale invariant spectrum of primordial perturbations, it turns out that in its simplest form it cannot account for the observed amplitude of the primordial density perturbations.
引用
收藏
页数:11
相关论文
共 19 条
[1]   k-Inflation [J].
Armendáriz-Picón, C ;
Damour, T ;
Mukhanov, V .
PHYSICS LETTERS B, 1999, 458 (2-3) :209-218
[2]   Primordial adiabatic fluctuations from cosmic defects [J].
Avelino, PP ;
Martins, CJAP .
PHYSICAL REVIEW LETTERS, 2000, 85 (07) :1370-1373
[3]  
Birrell N. D., 1982, QUANTUM FIELDS CURVE
[4]   Noncommutative spacetime, stringy spacetime uncertainty principle, and density fluctuations [J].
Brandenberger, R ;
Ho, PM .
PHYSICAL REVIEW D, 2002, 66 (02)
[5]  
BRANDENBERGER R, 2002, AAPPS B, V12, P10
[6]  
Chandrasekhar S., 1939, INTRO STUDY STELLAR
[7]  
CHUNG DJ, 2003, ASTROPH0305193
[8]   Generation of a scale-invariant spectrum of adiabatic fluctuations in cosmological models with a contracting phase [J].
Finelli, F ;
Brandenberger, R .
PHYSICAL REVIEW D, 2002, 65 (10)
[9]   Parametric amplification of metric fluctuations during reheating in two field models [J].
Finelli, F ;
Brandenberger, R .
PHYSICAL REVIEW D, 2000, 62 (08) :1-12
[10]   Perturbations in k-inflation [J].
Garriga, J ;
Mukhanov, VF .
PHYSICS LETTERS B, 1999, 458 (2-3) :219-225