Supersymmetric superheavy dark matter

TL;DR

This paper proposes the lightest supersymmetric particle as a candidate for superheavy dark matter, demonstrating its production mechanisms, abundance, and cosmological implications within a supersymmetric framework.

Contribution

It introduces a novel scenario where the LSP acts as superheavy dark matter, detailing its production and properties in the context of supersymmetry and inflation.

Findings

LSP can be produced with correct abundance via inflationary mechanisms.

Mass of LSP must be above 3×10^{11} GeV for gravitational production.

Weak interactions remain perturbative despite superheavy mass.

Abstract

We propose the lightest supersymmetric particle (LSP) as a well-suited candidate for superheavy dark matter (SHDM). Various production mechanisms at the end of inflation can produce SHDM with the correct abundance, $\Omega_{LSP} h^2 \sim 0.1$, if its mass is sufficiently high. In particular, gravitational production requires that the mass $m_{LSP}$ of the LSP is above $3\times 10^{11} GeV$. Weak interactions remain perturbative despite the large mass hierarchy, $m_{LSP}\gg m_Z$, because of the special decoupling properties of supersymmetry. As a result the model is predictive and we discuss the relevant cosmological processes for the case of a superheavy neutralino within this scheme.