Experimental search for a Lorentz invariant spacetime granularity: Possibilities and bounds

TL;DR

This paper investigates potential observable effects of a Lorentz-invariant space-time granularity, modeling gravity as emergent from a deeper structure, and sets experimental bounds on the model's parameters.

Contribution

It introduces a detailed phenomenological model of Lorentz-invariant space-time granularity and analyzes experimental bounds on its parameters.

Findings

Experimental bounds on model parameters established

Model consistent with current Lorentz invariance tests

Supports emergent gravity hypothesis

Abstract

We consider a search for phenomenological signatures from an hypothetical space-time granularity that respects Lorentz invariance. The model is based on the idea that the metric description of Einstein's gravity corresponds to a hydrodynamic characterization of some deeper underlying structure, and that Einstein's gravity is thus to be seen as emergent. We present the specific phenomenological model in detail and analyze the bounds on its free parameters established by a experiment specifically designed to test this model.