Journal
UNIVERSE
Volume 8, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/universe8040229
Keywords
quantum gravity; quantum field theory; super-renormalizable gravity; higher-derivative gravity; UV-finite gravity; asymptotic safety; six-derivative gravity
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This paper discusses the conditions for ultraviolet finiteness and asymptotic safety in quantum field theory, contrasting the requirements of the two concepts through a specific example. It is shown that a fully UV-finite quantum theory can be achieved by introducing additional terms, rather than adding matter or special symmetries.
We present and discuss well known conditions for ultraviolet finiteness and asymptotic safety. The requirements for complete absence of ultraviolet divergences in quantum field theories and existence of a non-trivial fixed point for renormalization group flow in the ultraviolet regime are compared based on the example of a six-derivative quantum gravitational theory in d = 4 spacetime dimensions. In this model, it is possible for the first time to have fully UV-finite quantum theory without adding matter or special symmetry, but by inclusion of additional terms cubic in curvatures. We comment on similarities and some apparent differences between the two approaches, but we show that they are both compatible to each other. Finally, we motivate the claim that actually asymptotic safety needs UV-finite models for providing explicit form of the ultraviolet limit of Wilsonian effective actions describing special situations at fixed points.
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