Asymptotically free mimetic gravity
Asymptotically free mimetic gravity
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DOI：
10.1140/epjc/s10052-019-7075-y
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发表时间：
2019-07-03
影响因子：
4.4
通讯作者：
Russ, Tobias B.
中科院分区：
文献类型：
--
作者：
Chamseddine, Ali H.;Mukhanov, Viatcheslav;Russ, Tobias B.
渐近自由引力的思想是用一个受约束的模拟标量场来实现的。假设有效引力常数在某个极限曲率处为零。因此，避免了空间平坦的弗里德曼和卡斯纳宇宙中的奇点。相反，在这两种情况下的解决方案接近一个德西特度量与限制曲率。我们表明，量子度规波动消失时，这一极限曲率接近。
The idea of asymptotically free gravity is implemented using a constrained mimetic scalar field. The effective gravitational constant is assumed to vanish at some limiting curvature. As a result singularities in spatially flat Friedmann and Kasner universes are avoided. Instead, the solutions in both cases approach a de Sitter metric with limiting curvature. We show that quantum metric fluctuations vanish when this limiting curvature is approached.