A built-in scale in the initial spectrum of density perturbations: evidence from cluster and CMB data

被引:14
作者
AtrioBarandela, F
Einasto, J
Gottlober, S
Muller, V
Starobinsky, A
机构
[1] TARTU ASTROPHYS OBSERV, EE-2444 TORAVERE, ESTONIA
[2] INST ASTROPHYS, D-14482 POTSDAM, GERMANY
[3] LD LANDAU THEORET PHYS INST, MOSCOW 117334, RUSSIA
关键词
D O I
10.1134/1.567540
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We calculate the temperature anisotropies of the cosmic microwave background (CMB) for several initial power spectra of density perturbations with a built-in scale suggested by recent optical data on the spatial distribution of rich clusters of galaxies. Using cosmological models with different values of the spectral index, baryon fraction, Hubble constant, and cosmological constant, we compare the calculated radiation power spectrum with the CMB temperature anisotropies measured by the Saskatoon experiment. We show that spectra with a spike at 120 h(-1) Mpc are in agreement with the Saskatoon data. The combined evidence from cluster and CMB data favors the presence of a peak and a subsequent break in the initial matter power spectrum. Such a feature is similar to the prediction of an inflationary model wherein an inflaton field is evolving through a kink in the potential. (C) 1997 American Institute of Physics.
引用
收藏
页码:397 / 403
页数:7
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