# QCD analogy for quantum gravity

@article{Holdom2015QCDAF, title={QCD analogy for quantum gravity}, author={Bob Holdom and Jing Ren}, journal={Physical Review D}, year={2015}, volume={93}, pages={124030} }

Quadratic gravity presents us with a renormalizable, asymptotically free theory of quantum gravity. When its couplings grow strong at some scale, as in QCD, then this strong scale sets the Planck mass. QCD has a gluon that does not appear in the physical spectrum. Quadratic gravity has a spin-2 ghost that we conjecture does not appear in the physical spectrum. We discuss how the QCD analogy leads to this conjecture and to the possible emergence of general relativity. Certain aspects of the QCD…

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