Why source-free gravity must be quantized

TL;DR

This paper argues that source-free General Relativity inherently requires quantization due to classical ultraviolet catastrophes, challenging some existing opinions and highlighting subtle theoretical issues.

Contribution

It demonstrates, through fundamental reasoning, that even source-free gravity cannot remain classical, establishing the necessity of quantization in this context.

Findings

Classical ultraviolet catastrophe in source-free gravity.

Necessity of quantization for consistency of gravity.

Challenges to prevailing opinions on classical gravity.

Abstract

I show, 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, an original result involving some rather tricky subtleties.