On unimodular quantum gravity
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...
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| Format: | Article (Journal) |
| Language: | English |
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13 May 2013
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| In: |
Classical and quantum gravity
Year: 2013, Volume: 30, Issue: 11 |
| ISSN: | 1361-6382 |
| DOI: | 10.1088/0264-9381/30/11/115016 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1088/0264-9381/30/11/115016 Verlag, Volltext: http://stacks.iop.org/0264-9381/30/i=11/a=115016 
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| Author Notes: | Astrid Eichhorn |
MARC
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| 520 | |a 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. Communicated by P R L V Moniz | ||
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