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arXiv 1809.06162hep-thgr-qc
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渐近安全的$f(R)$ -重力与物质耦合II:全局解

Asymptotically Safe $f(R)$-Gravity Coupled to Matter II: Global Solutions

Natalia Alkofer

摘要:

本文讨论了$f(R)$ -引力与物质场耦合的泛函重整化群方程的紫外不动点函数。通过指数参数化将度量分解为背景度量和涨落度量,前者被选择为四球度量之一。此外,当标量,费米子和矢量场包括全球二次解存在的一些自同态参数定义的粗粒度方案的离散值集的纯重力的情况下。的渐近,大曲率行为的不动点函数分析这些参数的通用值。提供了全局数值解的例子。一个特别的焦点是物质场是否可能破坏紫外不动点函数的问题。类似于以前的分析的多项式,小曲率逼近的不动点函数不同的类,这样的功能被发现。

英文摘要:

Ultraviolet fixed point functions of the functional renormalisation group equation for $f(R)$-gravity coupled to matter fields are discussed. The metric is split via the exponential parameterisation into a background and a fluctuating metric, the former is chosen to be the one of a four-sphere. Also when scalar, fermion and vector fields are included global quadratic solutions exist as in the pure gravity case for discrete sets of values for some endomorphism parameters defining the coarse-graining scheme. The asymptotic, large-curvature behaviour of the fixed point functions is analysed for generic values of these parameters. Examples for global numerical solutions are provided. A special focus is given to the question whether matter fields might destabilise the ultraviolet fixed point function. Similar to a previous analysis of a polynomial, small-curvature approximation to the fixed point functions different classes for such functions are found.

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