Instability of dark energy with mass-varying neutrinos
Instability of dark energy with mass-varying neutrinos
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DOI：
10.1103/physrevd.72.065024
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发表时间：
2005-09-01
影响因子：
5
通讯作者：
Kohri, K
中科院分区：
文献类型：
--
作者：
Afshordi, N;Zaldarriaga, M;Kohri, K
一个有趣的暗能量动力学模型是暗能量耦合到变质量中微子（MaVaNs）的模型，它不需要像quintessence这样的极轻标量场，同时解释了中微子和暗能量密度之间的（接近）巧合。尽管这个模型很吸引人，但我们表明，一般来说，当中微子变成非相对论性时，这个模型包含了灾难性的不稳定性。由于这种不稳定性，当中微子变得非相对论性时，它们会凝聚成中微子块，这些中微子块会像冷暗物质一样红移，从而停止充当暗能量。任何稳定的MaVaNs暗能量模型都是极其人为的，实际上与宇宙常数难以区分。
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 nonrelativistic. As a result of this instability, as neutrinos become nonrelativistic, 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.