Sfermions and gauginos in a Lorentz-violating theory

TL;DR

This paper explores a Lorentz-violating supergravity model where sfermions and gauginos have unusual properties, proposing they could be dark matter candidates that explain small-scale cosmic structures.

Contribution

It introduces a novel Lorentz-violating supergravity framework with unique particle properties and discusses their implications for dark matter and cosmology.

Findings

Sfermions and gauginos can be stable dark matter candidates.

Dark matter composed of these particles is cold but relativistic, affecting structure formation.

The particles have distinctive properties that differentiate them from standard supersymmetric partners.

Abstract

In Lorentz-violating supergravity, sfermions have spin 1/2 and other unusual properties. If the dark matter consists of such particles, there is a natural explanation for the apparent absence of cusps and other small scale structure: The Lorentz-violating dark matter is cold because of the large particle mass, but still moves at nearly the speed of light. Although the R-parity of a sfermion, gaugino, or gravitino is +1 in the present theory, these particles have an "S-parity'' which implies that the LSP is stable and that they are produced in pairs. On the other hand, they can be clearly distinguished from the superpartners of standard supersymmetry by their highly unconventional properties.