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Quadratic gravity: from weak to strong · Around

2016

Quadratic gravity: from weak to strong

Holdom, Bob, Ren, Jing

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More than three decades ago quadratic gravity was found to present a perturbative, renormalizable and asymptotically free theory of quantum gravity.

Unfortunately the theory appeared to have problems with a spin-2 ghost.
In this essay we revisit quadratic gravity in a different light by considering the case that the asymptotically free interaction flows to a strongly interacting regime.
This occurs when the coefficient of the Einstein-Hilbert term is smaller than the scale $\Lambda_{\mathrm{QG}}$ where the quadratic couplings grow strong.

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K. S. Stelle, Phys. Rev. D 16
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B. Holdom and J. Ren, arXiv:1512.05305 [hep-th]
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B. Holdom, Phys. Rev. D 66
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2002
Later among the works it cites.
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2016
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