Other
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.259p..41p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 259, no. 4, p. 41P-46P.
Other
24
Astronomical Models, Galactic Evolution, Power Spectra, Relic Radiation, Dark Matter, Galactic Structure, Universe
Scientific paper
Many popular models for galaxy formation are based on power spectra which behave as P(k) = Ak for small k and flatten at large k. The resulting mass fluctuation can be constrained by galaxy surveys up to R about 60/h Mpc. Recent COBE results, however, constrain the dark matter spectrum at very large scales and are consistent with a scale-invariant density spectrum sigmaDM(R). The extrapolated COBE results matches galaxy survey results at 50/h Mpc, suggesting that biasing is not significant at R greater than about 50/h Mpc. On the other hand, a CDM spectrum normalized to the COBE value overshoots galaxy survey results at small scales. Comparing the shape of sigma(R) at R less than about 60/h Mpc with the COBE results, it is found that relatively rapid bend in sigma(R) around R 40-60/h Mpc is needed. It is shown that simple models describing this bend are severely constrained.
Narasimha D.
Padmanabhan Thanu
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