Mimetic dark matter
Mimetic dark matter
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DOI：
10.1007/jhep11(2013)135
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发表时间：
2013-11-18
影响因子：
5.4
通讯作者：
Mukhanov, Viatcheslav
中科院分区：
文献类型：
--
作者：
Chamseddine, Ali H.;Mukhanov, Viatcheslav
我们修改了爱因斯坦的引力理论，以协变的方式隔离共形自由度。这是通过引入一个物理度量来实现的，该物理度量定义为一个辅助度量和一个通过其一阶导数出现的标量场。由此产生的运动方程分裂成一个无迹方程，通过相对于辅助度量的变化和一个额外的微分方程的痕迹部分。因此，即使在没有物质的情况下，共形自由度也是动态的。我们表明，这种额外的自由度可以模拟冷暗物质。
We modify Einstein's theory of gravity, isolating the conformal degree of freedom in a covariant way. This is done by introducing a physical metric defined in terms of an auxiliary metric and a scalar field appearing through its first derivatives. The resulting equations of motion split into a traceless equation obtained through variation with respect to the auxiliary metric and an additional differential equation for the trace part. As a result the conformal degree of freedom becomes dynamical even in the absence of matter. We show that this extra degree of freedom can mimic cold dark matter.