Why is quantum gravity so difficult (compared to QCD)?
Abstract
Gravity is difficult to quantize. This is a wellknown fact but its reason is given simply by nonrenormalizability of the Newton constant and little is discussed why among many quantum gauge theories, gravity is special. In this essay we try to treat the gravity as one of many gauge theories, and discuss how it is special and why it is difficult to quantize.
 Publication:

arXiv eprints
 Pub Date:
 November 2018
 arXiv:
 arXiv:1811.11577
 Bibcode:
 2018arXiv181111577F
 Keywords:

 High Energy Physics  Theory;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Lattice;
 High Energy Physics  Phenomenology
 EPrint:
 14 pages, misreading counting of degrees of freedom under the vierbein postulate corrected