Beyond the Planck scale

TL;DR

This paper discusses the possibility that significant quantum gravity effects occur beyond the Planck scale, motivated by ultra-high energy scattering and cosmological considerations, and explores potential principles for a more fundamental theory.

Contribution

It proposes that quantum gravity effects extend beyond the Planck scale and suggests avenues for future research into fundamental principles of quantum gravity.

Findings

Quantum gravity effects may occur at energies and scales beyond the Planck scale.

Ultra-high energy scattering provides insights into ultra-planckian physics.

Cosmological considerations support the existence of physics beyond the Planck scale.

Abstract

I outline motivations for believing that important quantum gravity effects lie beyond the Planck scale at both higher energies and longer distances and times. These motivations arise in part from the study of ultra-high energy scattering, and also from considerations in cosmology. I briefly summarize some inferences about such ultra-planckian physics, and clues we might pursue towards the principles of a more fundamental theory addressing the known puzzles and paradoxes of quantum gravity.