Where Is the Dark Matter?
نویسندگان
چکیده
منابع مشابه
Where Does The Dark Matter Begin?
While there is convincing evidence that the central regions (r ≪ Re) of earlytype galaxies are dominated by stars and that the outer regions (r ≫ Re) are dominated by dark matter, the structure of early-type galaxies in the transition region (a few effective radii Re) between the stars and the dark matter is unclear both locally and in gravitational lenses. Understanding the structure of galaxi...
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Newtonian mechanics indicates that galaxies and galaxy clusters are much more massive than we would have guessed from their luminosities, with the discrepancy being generally attributed to dark matter halos. An alternative hypothesis is that accelerations in very weak gravitational fields are larger than predicted by Newton’s laws, and there is no need for dark matter. Even though we do not cur...
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A smooth unclustered dark matter component with negative presure could reconcile a flat universe with the many observations that find a density in ordinary, clustered matter well below the critical density and also explain the recent high redshift supernova data suggesting that the expansion of the universe is now accelerating. For a perfect fluid negative presure leads to instabilities that ar...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1995
ISSN: 0004-637X
DOI: 10.1086/309577