A Lightweight Universe?

Details A Lightweight Universe? A Lightweight Universe?

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.3002b&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #30.02; Bulletin of the American Astronomical Society, Vol. 31, p.867

Astronomy and Astrophysics

Astronomy

Scientific paper

What is the mass-density of the universe? and how is the mass distributed? We show that several independent methods utilizing clusters of galaxies - including cluster dynamics and the mass-to-light ratio, baryon fraction, and cluster evolution - all indicate the same consistent result: the mass-density of the universe is low, about 0.2-0.3 of the critical density, and mass approximately traces light on large scales. When combined with the SNIa and the microwave background results, the data suggest a universe that is lightweight, accelerating, and flat.

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