Cosmological Selection of Multi-TeV Supersymmetry

Understand

We discuss a possible answer to the fundamental question of why nature would actually prefer low-scale supersymmetry, but end up with a supersymmetry scale that is not completely natural.

• This question is inevitable if we postulate that low-energy supersymmetry is indeed realized in nature, despite the null observation of superparticles below a TeV at the Large Hadron Collider.
• As we argue in this paper, superparticles masses in the multi-TeV range can, in fact, be reconciled with the concept of naturalness by means of a cosmological selection effect--a selection effect based on the assumption of an exact discrete R-symmetry that is spontaneously broken by gaugino condensation in a pure supersymmetric Yang-Mills theory.
• In such theories, the dynamical scale of the Yang-Mills gauge interactions is required to be higher than the inflationary Hubble scale, in order to avoid the formation of domain walls.