Unification of gravity and quantum mechanics

Determine a consistent and empirically testable theory that unifies general relativity (classical gravity) with quantum mechanics, resolving their conceptual and mathematical incompatibilities.

Background

The paper situates its results within the longstanding challenge of reconciling gravity with quantum theory. Despite major progress in quantizing the other fundamental interactions, gravity has resisted standard quantization approaches. The authors reference contemporary experimental efforts to probe the quantum nature of gravity via entanglement generation and argue that classical theories, when treated at the quantum field theoretic level for matter, can also produce entanglement. This underscores that the broader foundational question of unification remains unanswered and motivates careful experimental design to distinguish quantum from classical gravitational effects.

References

The unification of gravity and quantum mechanics remains one of the most profound open questions in science.

— Classical theories of gravity produce entanglement  (2510.19714 - Aziz et al., 22 Oct 2025) in Abstract

Unifying general relativity with quantum mechanics remains a fundamental open problem in theoretical physics.

— Quantum correlations and Basis-Independent Coherence Distribution in Two Gravitational Cat States  (2608.13493 - Mansour et al., 13 Aug 2026) in Section 1, Introduction

Furthermore, considering that a complete quantum theory of gravity is still missing, one can strongly consider the search for alternatives to GR.

— On entropic cosmology, late time acceleration and the quantum bounce  (2608.19146 - Diaz-Barron et al., 19 Aug 2026) in Section 1, Introduction

A fundamental microscopic derivation of $f(T)$ from an underlying quantum theory of gravity remains an open problem and is left for future investigation.

— Static Spherically Symmetric Solutions in Modified Entropic Gravity  (2609.04966 - Rostami et al., 4 Sep 2026) in Section 2, “Modified Einstein Equations”