The Swampland Conjectures: A bridge from Quantum Gravity to Particle Physics

TL;DR

This paper reviews the swampland conjectures linking quantum gravity constraints to particle physics, discussing how certain effective theories are incompatible with quantum gravity and exploring their implications for neutrino masses, cosmology, and fundamental scales.

Contribution

It provides a comprehensive overview of the conjectural properties that effective theories must have to be consistent with quantum gravity, highlighting their applications in particle physics.

Findings

Predictions on neutrino masses

Bounds on the cosmological constant

Insights into supersymmetry

Abstract

The swampland is the set of seemingly consistent low-energy effective field theories that cannot be consistently coupled to quantum gravity. In this review we cover some of the conjectural properties that effective theories should possess in order not to fall in the swampland, and we give an overview of their main applications to particle physics. The latter include predictions on neutrino masses, bounds on the cosmological constant, the electroweak and QCD scales, the photon mass, the Higgs potential and some insights about supersymmetry.