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arXiv:astro-ph/0506663 (astro-ph)
[Submitted on 27 Jun 2005]

Title:On the stability of Dark Energy with Mass-Varying Neutrinos

Authors:Niayesh Afshordi, Matias Zaldarriaga (Harvard), Kazunori Kohri (Harvard/Osaka)
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Abstract: An interesting dynamical model for dark energy which does not require extremely light scalar fields such as quintessence, and at the same time explains the (near-) coincidence between the neutrino and dark energy densities is the model of dark energy coupled to mass varying neutrinos (MaVaNs). Despite the attractions of this model, we show that, generically, this model contains a catastrophic instability which occurs when neutrinos become non-relativistic. As a result of this instability, as neutrinos become non-relativistic, they condense into neutrino nuggets which redshift away similar to cold dark matter, and thus cease to act as dark energy. Any stable MaVaNs dark energy model is extremely contrived, and is virtually indistinguishable from a cosmological constant.
Comments: 10 pages, 3 figures, submitted to Physical Review D
Subjects: Astrophysics (astro-ph); High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th)
Cite as: arXiv:astro-ph/0506663
  (or arXiv:astro-ph/0506663v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0506663
Journal reference: Phys.Rev.D72:065024,2005
Related DOI: https://doi.org/10.1103/PhysRevD.72.065024

Submission history

From: Niayesh Afshordi [view email]
[v1] Mon, 27 Jun 2005 20:21:59 UTC (33 KB)
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