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  Asymptotic safety goes on shell

Benedetti, D. (2012). Asymptotic safety goes on shell. New Journal of Physics, 14: 015005. doi:10.1088/1367-2630/14/1/015005.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-0AE0-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-0AE3-6
Genre: Journal Article

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1107.3110 (Preprint), 249KB
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 Creators:
Benedetti, Dario1, Author              
Affiliations:
1Microscopic Quantum Structure & Dynamics of Spacetime, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:67201              

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Free keywords: High Energy Physics - Theory, hep-th
 Abstract: It is well known in quantum field theory that the off-shell effective action depends on the gauge choice and field parametrization used in calculating it. Nevertheless, the typical scheme in which the scenario of asymptotically safe gravity is investigated is an off-shell version of the functional renormalization group equation. Working with the Einstein-Hilbert truncation as a test bed, we develop a new scheme for the analysis of asymptotically safe gravity in which the on-shell part of the effective action is singled out and we show that the beta function for the essential coupling has no explicit gauge-dependence. In order to reach our goal, we introduce several technical novelties, including a different decomposition of the metric fluctuations, a new implementation of the ghost sector, and a new cut-off scheme. We find a non-trivial fixed point, with a value of the cosmological constant which is independent of the gauge-fixing parameters.

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 Dates: 2011-07-1520112012
 Publication Status: Published online
 Pages: 20 pages
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1107.3110
URI: http://arxiv.org/abs/1107.3110
DOI: 10.1088/1367-2630/14/1/015005
 Degree: -

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Title: New Journal of Physics
Source Genre: Journal
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Pages: - Volume / Issue: 14 Sequence Number: 015005 Start / End Page: - Identifier: -