Warped Kaluza-Klein Dark Matter

TL;DR

This paper investigates warped Kaluza-Klein modes in string theory compactifications as dark matter candidates, analyzing their decay rates and potential observational signatures to constrain model parameters.

Contribution

It provides a detailed analysis of decay rates of warped Kaluza-Klein modes, highlighting their longevity and potential detectability, which was not thoroughly explored before.

Findings

Dark matter candidates have lifetimes longer than the universe's age.

Certain model embeddings lead to observable decay rates.

Decay rates depend on the specifics of the compactification and isometry breaking.

Abstract

Warped compactifications of type IIB string theory contain natural dark matter candidates: Kaluza-Klein modes along approximate isometry directions of long warped throats. These isometries are broken by the full compactification, including moduli stabilization; we present a thorough survey of Kaluza-Klein mode decay rates into light supergravity modes and Standard Model particles. We find that these dark matter candidates typically have lifetimes longer than the age of the universe. Interestingly, some choices for embedding the Standard Model in the compactification lead to decay rates large enough to be observed, so this dark matter sector may provide constraints on the parameter space of the compactification.