Dark Energy density in Split SUSY models inspired by degenerate vacua

TL;DR

This paper explores how degenerate vacua in no-scale supergravity models can naturally explain the observed dark energy density within split supersymmetry scenarios, linking high-scale SUSY breaking to cosmological constant values.

Contribution

It proposes a mechanism connecting degenerate vacua with broken and unbroken SUSY to the observed dark energy, estimating the SUSY breaking scale needed.

Findings

Dark energy density can be explained by degenerate vacua in split SUSY models.

SUSY breaking scale around 10^{10} GeV reproduces observed dark energy.

Degeneracy of vacua supports the multiple point principle in supergravity.

Abstract

It is well known that global symmetries protect local supersymmetry and a zero value for the cosmological constant in no--scale supergravity. The breakdown of these symmetries, which ensure the vanishing of the vacuum energy density, results in a set of degenerate vacua with broken and unbroken supersymmetry leading to the natural realisation of the multiple point principle (MPP). Assuming the degeneracy of vacua with broken and unbroken SUSY in the hidden sector we estimate the value of the cosmological constant. We argue that the observed value of the dark energy density can be reproduced in the split-SUSY scenario if the SUSY breaking scale is of the order of 10^{10} GeV.