Smallness of the cosmological constant and the multiple point principle

TL;DR

This paper discusses how the breakdown of global symmetries in no-scale supergravity models naturally leads to a tiny cosmological constant through the multiple point principle, offering a theoretical explanation for its small value.

Contribution

It proposes a mechanism within no-scale supergravity where symmetry breaking enforces a tiny cosmological constant via the multiple point principle.

Findings

Global symmetry breakdown in no-scale SUGRA leads to vanishing vacuum energy.

The multiple point principle is naturally realized in these models.

The cosmological constant is predicted to be naturally tiny.

Abstract

In this talk we argue that the breakdown of global symmetries in no--scale supergravity (SUGRA), which ensures the vanishing of the vacuum energy density near the physical vacuum, leads to a natural realisation of the multiple point principle (MPP). In the MPP inspired SUGRA models the cosmological constant is naturally tiny.