The Search for Quantum Gravity Signals

TL;DR

This paper reviews ongoing efforts to detect quantum gravity effects, highlighting new approaches to Lorentz invariance violation and summarizing experimental and astrophysical results in the search for quantum gravity signals.

Contribution

It introduces a new framework for Lorentz invariance violation in the Maxwell sector and discusses strategies for experimental and theoretical searches for quantum gravity effects.

Findings

Laboratory experiments place constraints on quantum gravity models.

Astrophysical observations provide key bounds on Lorentz invariance violation.

New theoretical frameworks aid in guiding future quantum gravity phenomenology.

Abstract

We give an overview of ongoing searches for effects motivated by the study of the quantum-gravity problem. We describe in greater detail approaches which have not been covered in recent ``Quantum Gravity Phenomenology'' reviews. In particular, we outline a new framework for describing Lorentz invariance violation in the Maxwell sector. We also discuss the general strategy on the experimental side as well as on the theoretical side for a search for quantum gravity effects. The role of test theories, kinematical and dymamical, in this general context is emphasized. The present status of controlled laboratory experiments is described, and we also summarize some key results obtained on the basis of astrophysical observations.