中微子暗能量--再谈稳定性问题
Neutrino Dark Energy -- Revisiting the Stability Issue
摘要：
光标量场与中微子之间的耦合作为联系中微子质量（时变）与当前暗能量的能量密度和状态方程的机制已被广泛讨论。然而，有人指出，在非相对论中微子制度的可行性，这种情况下的威胁与负绝热声速平方相关的流体动力学扰动的强烈增长。在本文中，我们重新审视的稳定性问题的框架下的线性扰动理论的模型无关的方式。模型稳定性的判据被转化为标量中微子耦合的约束条件，该约束条件依赖于中微子和冷暗物质的能量密度之比。我们说明了我们的结果提供了有意义的例子稳定和不稳定的模型。
英文摘要：
A coupling between a light scalar field and neutrinos has been widely discussed as a mechanism for linking (time varying) neutrino masses and the present energy density and equation of state of dark energy. However, it has been pointed out that the viability of this scenario in the non-relativistic neutrino regime is threatened by the strong growth of hydrodynamic perturbations associated with a negative adiabatic sound speed squared. In this paper we revisit the stability issue in the framework of linear perturbation theory in a model independent way. The criterion for the stability of a model is translated into a constraint on the scalar-neutrino coupling, which depends on the ratio of the energy densities in neutrinos and cold dark matter. We illustrate our results by providing meaningful examples both for stable and unstable models.
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