Severe Challenges In Gravity Theories

TL;DR

This paper discusses the fundamental nature of gravity, questioning whether it is inherently classical or quantum, and highlights the significant challenges faced by current quantum gravity theories.

Contribution

It proposes that gravity might be fundamentally classical, suggesting the existence of a deeper theory underlying current quantum approaches.

Findings

Quantum gravity theories have not yet succeeded in quantizing gravity.

Many quantum gravity theories have faced significant difficulties.

The paper hypothesizes gravity may be an emergent classical phenomenon.

Abstract

Gravity is specifically the attractive force between two masses separated at a distance. Is this force a derived or a fundamental interaction? We believe that all fundamental interactions are quantum in nature but a derived interaction may be classical. Severe challenges have appeared in many quantum theories of gravity. None of these theories has thus far attained its goal in quantizing gravity and some have met remarkable defeat. We are led to ponder whether gravitation is intrinsically classical and that there would exist a deeper and structurally different underlying theory which would give rise to classical gravitation, in the sense that statistical mechanics, quantum or classical, provides the underlying theory of classical thermodynamics.