Mathematics – Logic
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248...52b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Jan. 1, 1991, p. 52-57.
Mathematics
Logic
22
Black Body Radiation, Density Distribution, Galactic Evolution, Relic Radiation, Baryons, Cosmic Background Explorer Satellite, Microwave Spectra
Scientific paper
Recent COBE observational limits on departures of the spectrum of the cosmic microwave background (CMB) from a pure blackbody curve are used to constrain models of galaxy formation. The damping of adiabatic density perturbations at high redshifts (z of about 100,000) injects energy into the primordial plasma which cannot be thermalized and therefore distorts the CMB spectrum. It is found that flat baryon-dominated models with power-law primordial fulctuations having n greater than 4 and open baryonic models with n greater than 1. The results complement other constraints from microwave background temperature anisotropies, nucleosynthesis and galaxy clustering and, taken together, they suggest very strongly that there is either a preponderance of nonbaryonic dark matter, a nonzero cosmological constant, a source of isocurvature (rather than adiabatic) fluctuations in the early universe, or some other source of density perturbations (such as nonsuperconducting cosmic strings).
Barrow John D.
Coles Peter
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