Halo cold dark matter and microlensing

Journal Article · Wed Dec 01 00:00:00 EST 1993 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.72.2520· OSTI ID:1155558

Gates, Evalyn ^[1]; Turner, Michael S. ^[2]

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1. Enrico Fermi Institute, Univ. of Chicago, IL (United States)
2. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Enrico Fermi Institute, Univ. of Chicago, IL (United States)

There is good evidence that most of the baryons in the Universe are dark and some evidence that most of the matter in the Universe is nonbaryonic with cold dark matter (cdm) being a promising possibility. We discuss expectations for the abundance of baryons and cdm in the halo of our galaxy and locally. We show that in plausible cdm models the local density of cdm is at least $$10^{-25}\gcmm3$$. We also discuss what one can learn about the the local cdm density from microlensing of stars in the LMC by dark stars in the halo and, based upon a suite of reasonable two-component halo models, conclude that microlensing is not a sensitive probe of the local cdm density.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1155558
• Report Number(s): FERMILAB-PUB-93-357-A; PRLTAO
• Journal Information: Physical Review Letters, Vol. 72, Issue 16; ISSN 0031-9007
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS