CDM models with a BSI step-like primordial spectrum and a cosmological constant

被引:65
作者
Lesgourgues, J
Polarski, D
Starobinsky, AA
机构
[1] Univ Tours, UPRES A 6083 CNRS, Lab Math & Phys theor, F-37200 Tours, France
[2] Observ Paris, Dept Astrophys Relativiste & Cosmol, F-92195 Meudon, France
[3] LD Landau Theoret Phys Inst, Moscow 117334, Russia
关键词
cosmology; theory; dark matter; early Universe; large-scale structure of Universe;
D O I
10.1046/j.1365-8711.1998.01537.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A class of spatially flat models with cold dark matter (CDM), a cosmological constant and a broken-scale-invariant (BSI) step-like primordial (initial) spectrum of adiabatic perturbations, generated in an exactly solvable inflationary model where the inflaton potential has a rapid change of its first derivative at some point, is confronted with existing observational data on angular fluctuations of the CMB temperature, galaxy clustering and peculiar velocities of galaxies. If we locate the step in the initial spectrum at k similar or equal to 0.05 h Mpc(-1), where a feature in the spectrum of Abell clusters of galaxies was found that could reflect a property of the initial spectrum, and if the large-scale flat plateau of the spectrum is normalized according to the COBE data, the only remaining parameter of the spectrum is p - the ratio of amplitudes of the metric perturbations between the small-scale and large-scale flat plateaux. Allowed regions in the plane of parameters (Omega = 1 - Omega(Lambda), H-0) satisfying all data have been found for p lying in the region (0.8-1,7). Especially good agreement of the form of the present power spectrum in this model with the form of the cluster power spectrum is obtained for the inverted step (p < 1,p = 0.7-0.8), when the initial spectrum has slightly more power on small scales.
引用
收藏
页码:769 / 776
页数:8
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