Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-08-13
JETP Lett. 66 (1997) 397-403
Astronomy and Astrophysics
Astrophysics
LaTex style, 9 pages, 3 PostScript figures embedded, accepted by J. Exper. Theor. Phys
Scientific paper
10.1134/1.567540
We calculate 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 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 sharp peak at 120 h^{-1} Mpc are in agreement with the Saskatoon data. The combined evidence from cluster and CMB data favours the presence of a peak and a subsequent break in the initial matter power spectrum. Such feature is similar to the prediction of an inflationary model where an inflaton field is evolving through a kink in the potential.
Atrio-Barandela Fernando
Einasto Jaan
Gottlöber Stefan
Müller Volker
Starobinsky Alexei A.
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