Some not-so-common ideas about gravity

TL;DR

This paper explores alternative ideas about gravity by examining the implications of deviating from common principles like quantum description and relational nature, assessing their experimental viability and future impact.

Contribution

It investigates the consequences of relaxing standard principles in quantum gravity theories, offering a broader perspective on possible models and their experimental testability.

Findings

Deviations from standard principles may still be compatible with current experiments.

Relaxing principles could lead to new testable predictions in gravity.

The study highlights potential directions for future experimental investigations.

Abstract

Most of the approaches to the construction of a theory of quantum gravity share some principles which do not have specific experimental support up to date. Two of these principles are relevant for our discussion: (i) the gravitational field should have a quantum description in certain regime, and (ii) any theory of gravity containing general relativity should be relational. We study in general terms the possible implications of assuming deviations from these principles, their compatibility with current experimental knowledge, and how can they affect future experiments.