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Effective universality in quantum gravity
by Astrid Eichhorn, Peter Labus, Jan M. Pawlowski, Manuel Reichert
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|Authors (as registered SciPost users):
|Jan M. Pawlowski · Manuel Reichert
We investigate the asymptotic safety scenario for a scalar-gravity system. This system contains two avatars of the dynamical Newton coupling, a gravitational self-coupling and a scalar-graviton coupling. We uncover an effective universality for the dynamical Newton coupling on the quantum level: its momentum-dependent avatars are in remarkable quantitative agreement in the scaling regime of the UV fixed point. For the background Newton coupling, this effective universality is not present, but qualitative agreement remains.
Published as SciPost Phys. 5, 031 (2018)
List of changes
- extended motivation in the introduction
- added paragraph about STIs below equation (5)
- included Litim-type regulator and York-decomposition in App. A
- references updated
- other minor changes
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The authors have responded to
my critique. They have improved their rationale, and acknowledged the
limitations of the paper but pointed out the difficulties in doing better.
It is already clear that the paper reports on a substantive amount of
work. I think the paper
should be published.