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Dilaton Quantum Gravity

Tobias Henz
(
- Heidelberg U.
)
,
Jan Martin Pawlowski
(
- Heidelberg U.
)
,
Andreas Rodigast
(
- Heidelberg U.
)
,
Christof Wetterich
(
- Heidelberg U.
)

Apr 29, 2013

5 pages

Published in:

Phys.Lett.B 727 (2013) 298-302

Published: Nov 25, 2013

e-Print:

1304.7743 [hep-th]

DOI:

10.1016/j.physletb.2013.10.015

View in:

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Abstract: (Elsevier)

We propose a simple fixed-point scenario in the renormalization flow of a scalar dilaton coupled to gravity. This would render gravity non-perturbatively renormalizable and thus constitute a viable theory of quantum gravity. On the fixed point dilatation symmetry is exact and the quantum effective action takes a very simple form. Realistic gravity with a nonzero Planck mass is obtained through a nonzero expectation value for the scalar field, constituting a spontaneous scale symmetry breaking. Furthermore, relevant couplings for the flow away from the fixed point can be associated with a “dilatation anomaly” that is responsible for dynamical dark energy. For the proposed fixed point and flow away from it the cosmological “constant” vanishes for asymptotic time.

Note:

6 pages, 2 figures, version to appear in PLB

dilaton: coupling
dilaton: scalar
symmetry breaking: scale
field theory: scalar
symmetry: dilation
scale: Planck
fixed point
gravitation
flow
quantum gravity

References(22)

Figures(3)

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