论文标题
两场模拟重力的延伸
Extensions of two-field mimetic gravity
论文作者
论文摘要
最近，通过查看辅助度量与物理指标之间的共形转换的奇异极限来实现两场模拟重力，并涉及两个标量场。在本文中，我们重新分析了奇异的保形极限，并找到了共形因子A的更一般的解决方案，该解决方案大大拓宽了两场模拟约束的形式，从而扩展了两场模拟物的重力。我们发现，一般的设置仍模仿宇宙学背景层面的暗物质的作用。此外，我们通过引入现象学利益的额外可能的术语来扩展行动。令人惊讶的是，发现某些特殊案例等同于一般相对论，k词理论和加利昂理论。最后，我们通过允许模仿约束的表达在没有施加条件的情况下进一步扩展理论，并表明即使在此扩展中，类似暗物质的行为也不会受到影响。
Two-field mimetic gravity was recently realized by looking at the singular limit of the conformal transformation between the auxiliary metric and the physical metric with two scalar fields involved. In this paper, we reanalyze the singular conformal limit and find a more general solution for the conformal factor A, which greatly broadens the form of two-field mimetic constraint and thus extends the two-field mimetic gravity. We find the general setup still mimics the roles of dark matter at the cosmological background level. Moreover, we extend the action by introducing extra possible term for phenomenological interests. Surprisingly, some special cases are found to be equivalent to general relativity, k-essence theory and Galileon theory. Finally, we further extend the theory by allowing the expression of mimetic constraint to be arbitrary without imposed condition, and show that the dark matter-like behavior is unaffected even in this extension.
