Tantum Gravity

TL;DR

Tantum gravity is a novel triple-scaling limit of quantum gravity where certain constants scale in a specific way, preserving black hole thermodynamics and potentially simplifying black hole puzzles.

Contribution

The paper introduces and explores the properties of tantum gravity, a new limiting theory of quantum gravity with unique scaling behavior.

Findings

Black hole thermodynamics laws survive the limit

Tantum gravity may simplify black hole evaporation puzzles

The theory offers new prospects for understanding quantum gravity

Abstract

We argue there is an interesting triple-scaling limit of quantum gravity, namely when Planck's constant scales to infinity while Newton's constant and the speed of light tend to zero, keeping fixed the gravitational coupling $G_N\,c^{-4}$ and the combination $\hbar\,c$. We refer to this limiting theory as ``tantum gravity'' and describe in this Letter some of its main properties and prospects for physics. Most notably, the laws of black hole thermodynamics survive this limit, which means that puzzles related to black holes and their evaporation could be addressed more easily in tantum gravity than in fully-fledged quantum gravity.