Cosmological Constant in SUGRA Models Inspired by Degenerate Vacua

TL;DR

This paper discusses how specific symmetry breakings in supergravity models inspired by the multiple point principle naturally lead to a tiny cosmological constant, addressing a fundamental issue in cosmology.

Contribution

It introduces a mechanism within SUGRA models where symmetry breakdowns ensure a near-zero cosmological constant, inspired by the MPP.

Findings

Cosmological constant is naturally tiny in these models

Symmetry breaking leads to multiple degenerate vacua

Addresses the cosmological constant problem

Abstract

It is well known that global symmetries protect local supersymmetry and a zero value for the cosmological constant in no--scale supergravity. A particular breakdown of these symmetries, which ensures the vanishing of the vacuum energy density, leads to the natural realisation of the multiple point principle (MPP). In the MPP inspired SUGRA models the cosmological constant is naturally tiny.