Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Disappearance of dark matter since the Big Bang

  1. Dec 11, 2014 #1
    Can someone explain the disappearance of 57% of dark matter since the Big Bang?

    Is dark energy eating dark matter?
  2. jcsd
  3. Dec 11, 2014 #2


    User Avatar
    Science Advisor
    Gold Member

  4. Dec 12, 2014 #3


    User Avatar
    Science Advisor
    Gold Member

    Is it just systematic error, carnivorous Dark Energy, sterile neutrinos or modified gravity?

    We wait and see!!

  5. Dec 12, 2014 #4


    User Avatar
    Science Advisor
    Gold Member
    Dearly Missed

    Thanks for a specific link! Just noting that the paper you link to is
    Indications of a late-time interaction in the dark sector
    Valentina Salvatelli, Najla Said, Marco Bruni, Alessandro Melchiorri, David Wands
    (Submitted on 27 Jun 2014)
    http://inspirehep.net/search?p=find eprint 1406.7297

    Beyond me but here is how a later paper placed it in context and perspective, I quote the conclusions section of
    Banana Split: Testing the Dark Energy Consistency with Geometry and Growth
    Eduardo J. Ruiz, Dragan Huterer
    (Submitted on 21 Oct 2014)

    ==quote http://arxiv.org/abs/arXiv:1410.5832 ==
    Let us consider possible reasons for the pull of redshift-space distortions toward wgrow > −1. This result is qualitatively not new: a number of recent investigations have already been established that the RSD data are in some conflict with ΛCDM, suggesting less growth at recent times than predicted by the standard model [61].
    For example, Beutler et al. [62] have measured a > 2-σ tension in measurements of the growth index γ = 0.772+0.124 −0.097 relative to the ΛCDM (and, for that matter, also wCDM) prediction γ ≃ 0.55.
    Similarly, Samushia et al. [48], using DR11 CMASS sample, and the more precise results by Reid et al. [63] that utilized smaller spatial scales by doing extensive halo occupation distribution modeling, have obtained similar results, indicating that growth is suppressed relative to ΛCDM prediction at approximately the 2-σ level.
    Moreover, Beutler et al. [64] find a ∼2.5σ evidence for nonzero neutrino mass, again a signature of the hints of the departure from the standard model.
    Finally, Salvatelli et al. [65] utilize the combined cosmological probes (including the RSD) in the context of a model where vacuum energy interacts with dark matter, and interpret the results as detection of nonzero interactions between dark matter and dark energy — another possible interpretation of the departure from the standard ΛCDM model.
    There's also reference to the Salvatelli et al in this one, coauthored by Roy Maartens
    In this it is remarked at the outset that "The transfer of energy density between dark energy and dark matter is not ruled out by current observations (for recent work, see e.g. [8–15])" and reference [15] is to Salvatelli et al.

    Just for convenience here is the starter physicsworld link, and some others, not necessarily up to date or recommended:
    Last edited: Dec 12, 2014
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook