Why even source-free gravity must be quantized
Walter Burke Institute for Theoretical Physics, California Institute of Technology, 91125, Pasadena, CA, USA
2 Physics Department, Brandeis University, 02454, Waltham, MA, USA
Accepted: 29 April 2022
Published online: 10 May 2022
I note, on the most elementary grounds: its classical ultraviolet catastrophe, that even source-free General Relativity must be quantized, despite some eminent opinions to the contrary and with a little fine print.
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