Observers and their notion of spacetime beyond special relativity

TL;DR

This paper explores how quantum gravity might alter the fundamental understanding of spacetime and relativity, considering scenarios where the principle of relativity is either broken or deformed, affecting observer descriptions of events.

Contribution

It analyzes the conceptual and phenomenological differences between broken and deformed relativity in the context of quantum gravity effects.

Findings

Different observer descriptions of events under broken vs. deformed relativity

Implications for the notion of spacetime beyond special relativity

Potential phenomenological signatures of quantum gravity effects

Abstract

It is plausible that quantum gravity effects may lead us to a description of Nature beyond the framework of special relativity. In this case, either the relativity principle is broken or it is maintained. These two scenarios (a violation or a deformation of special relativity) are very different, both conceptually and phenomenologically. We discuss some of their implications on the description of events for different observers and the notion of spacetime.