Bose-Fermi cancellations without supersymmetry

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Abstract

We show that adjoint QCD features very strong Bose-Fermi cancellations in the large-N limit, despite the fact that it is manifestly nonsupersymmetric. The difference between the bosonic and fermionic densities of states in large-N adjoint QCD turns out to have a "two-dimensional" scaling ∼exp(E) for large energies E in finite spatial volume, where is a length scale associated with the curvature of the spatial manifold. In particular, all Hagedorn growth cancels, and so does the growth exp(V1/4E3/4) expected in a standard local four-dimensional theory in spatial volume V. In these ways, large-N adjoint QCD, a manifestly nonsupersymmetric theory, acts similarly to supersymmetric theories. We also show that at large-N the vacuum energy of multiflavor adjoint QCD is non-negative and exponentially small compared to the UV cutoff with several natural regulators.

Original languageEnglish (US)
Article number105001
JournalPhysical Review D
Volume99
Issue number10
DOIs
StatePublished - May 15 2019

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