期刊
CLASSICAL AND QUANTUM GRAVITY
卷 30, 期 11, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/30/11/115016
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资金
- Government of Canada through Industry Canada
- Province of Ontario through the Ministry of Research and Innovation
Unimodular gravity is classically equivalent to standard Einstein gravity, but differs when it comes to the quantum theory: the conformal factor is non-dynamical, and the gauge symmetry consists of transverse diffeomorphisms only. Furthermore, the cosmological constant is not renormalized. Thus the quantum theory is distinct from a quantization of standard Einstein gravity. Here we show that within a truncation of the full renormalization group flow of unimodular quantum gravity, there is a non-trivial ultraviolet (UV)-attractive fixed point, yielding a UV completion for unimodular gravity. We discuss important differences to the standard asymptotic-safety scenario for gravity, and provide further evidence for this scenario by investigating a new form of the gauge-fixing and ghost sector.
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