Kaluza-Klein States versus Winding States: Can Both Be Above the String Scale?

Details Kaluza-Klein States versus Winding States: Can Both Be Above the String Scale? Kaluza-Klein States versus Winding States: Can Both Be Above the String Scale?

2002-06-30

arxiv.org/abs/hep-ph/0207009v1

Phys.Rev.Lett.89:171602,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, LaTeX, no figures

Scientific paper

10.1103/PhysRevLett.89.171602

When closed strings propagate in extra compactified dimensions, a rich spectrum of Kaluza-Klein states and winding states emerges. Since the masses of Kaluza-Klein states and winding states play a reciprocal role, it is often believed that either the lightest Kaluza-Klein states or the lightest winding states must be at or below the string scale. In this paper, we demonstrate that this conclusion is no longer true for compactifications with non-trivial shape moduli. Specifically, we demonstrate that toroidal compactifications exist for which all Kaluza-Klein states as well as all winding states are heavier than the string scale. This observation could have important phenomenological implications for theories with reduced string scales, suggesting that it is possible to cross the string scale without detecting any states associated with spacetime compactification.

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