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arXiv 1504.05481astro-ph.COgr-qchep-phhep-th
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相互作用暗能量的有效理论

Effective Theory of Interacting Dark Energy

Jérôme Gleyzes, David Langlois, Michele Mancarella, Filippo Vernizzi

摘要:

我们提出了一个统一的治疗暗能量和修改的重力,允许不同的共形-非正式的物质种类的引力部门的耦合。在这个非常一般的方法中,我们推导出避免鬼和梯度不稳定性的条件。我们计算背景量和线性扰动的运动方程。我们用两个简单的场景来说明我们的形式主义,其中冷暗物质或相对论性流体是非最小耦合的。这将先前对耦合暗能量的研究扩展到更广泛的引力理论。

英文摘要:

We present a unifying treatment of dark energy and modified gravity that allows distinct conformal-disformal couplings of matter species to the gravitational sector. In this very general approach, we derive the conditions to avoid ghost and gradient instabilities. We compute the equations of motion for background quantities and linear perturbations. We illustrate our formalism with two simple scenarios, where either cold dark matter or a relativistic fluid is nonminimally coupled. This extends previous studies of coupled dark energy to a much broader spectrum of gravitational theories.

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