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The origin of cold dark matter halo density profiles

  1. Sep 3, 2005 #1

    Garth

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    http://www.arxiv.org/abs/astro-ph/0508624

    This paper offers a fairly natural explanation for the universality of dark matter halo profiles.

    In this model the mass accretion history has two distict phases, first a fast phase dominated by frequent mergers of smaller condensations of CDM, followed by a slow phase where mass slowly accretes onto the outer boundary of an existing central object. This model with only 2 phases accurately reproduces the properties of the CDM halo population, which, if correct, would imply that this is the key to explaining the universal nature of such haloes.

    The continued effort modelling the large and smaller scale structure in the universe bears fruit and leads to confidence in the LCDM paradigm.

    However where is the CDM? If and when it is discovered in the laboratory what properties will it have? Will these as-yet-undiscovered properties match the requirement of non-interacting CDM models such as the one here? We will have to wait and see.

    Garth
     
    Last edited: Sep 4, 2005
  2. jcsd
  3. Sep 3, 2005 #2

    SpaceTiger

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    Yeah, this paper is consistent with a lot of the ideas I've seen thrown around at conferences. By no means am I willing to blindly accept these ideas (this process is extremely difficult to model in the accretion phase), but it's nice to see that there is progress. By the way, your link is to the wrong abstract:

    http://www.arxiv.org/abs/astro-ph/0508624
     
  4. Sep 4, 2005 #3

    Garth

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    Whoops! Thank you, that's fixed it!

    Garth
     
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