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- W2891782948 abstract "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 metric and a fluctuating part, 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." @default.
- W2891782948 created "2018-09-27" @default.
- W2891782948 creator A5017631436 @default.
- W2891782948 date "2019-02-01" @default.
- W2891782948 modified "2023-10-15" @default.
- W2891782948 title "Asymptotically safe f(R)-gravity coupled to matter II: Global solutions" @default.
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- W2891782948 doi "https://doi.org/10.1016/j.physletb.2018.12.061" @default.
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