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Title: Dark matter and cosmology

The cosmological dark matter problem is reviewed. The Big Bang Nucleosynthesis constraints on the baryon density are compared with the densities implied by visible matter, dark halos, dynamics of clusters, gravitational lenses, large-scale velocity flows, and the {Omega} = 1 flatness/inflation argument. It is shown that (1) the majority of baryons are dark; and (2) non-baryonic dark matter is probably required on large scales. It is also noted that halo dark matter could be either baryonic or non-baryonic. Descrimination between cold'' and hot'' non-baryonic candidates is shown to depend on the assumed seeds'' that stimulate structure formation. Gaussian density fluctuations, such as those induced by quantum fluctuations, favor cold dark matter, whereas topological defects such as strings, textures or domain walls may work equally or better with hot dark matter. A possible connection between cold dark matter, globular cluster ages and the Hubble constant is mentioned. Recent large-scale structure measurements, coupled with microwave anisotropy limits, are shown to raise some questions for the previously favored density fluctuation picture. Accelerator and underground limits on dark matter candidates are also reviewed.
Authors:
Publication Date:
OSTI Identifier:
5368837
Report Number(s):
FNAL/C-92/88-A; CONF-9109182--3
ON: DE92013023; CNN: AST 90-22629; NAGW 2381
DOE Contract Number:
AC02-76CH03000; FG02-91ER40606
Resource Type:
Conference
Resource Relation:
Conference: 2. international workshop on theoretical and phenomenological aspects of underground physics, Toledo (Spain), 9-13 Sep 1991
Research Org:
Fermi National Accelerator Lab., Batavia, IL (United States); Chicago Univ., IL (United States). Dept. of Astronomy and Astrophysics
Sponsoring Org:
DOE; NASA; NSF; USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COSMOLOGY; NONLUMINOUS MATTER; BARYONS; COSMOLOGICAL MODELS; NUCLEOSYNTHESIS; RELICT RADIATION; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; FERMIONS; HADRONS; MATHEMATICAL MODELS; MATTER; MICROWAVE RADIATION; RADIATIONS; SYNTHESIS 661300* -- Other Aspects of Physical Science-- (1992-)