Using lattice simulations, we study the infrared behavior of a particularly interesting SU(2) gauge theory, with six massless Dirac fermions in the fundamental representation. We compute the running gauge coupling derived non-perturbatively from the Schrodinger functional of the theory, finding no evidence for an infrared fixed point up through gauge couplings of order 20. This implies that the theory either is governed in the infrared by a fixed point of considerable strength, unseen so far in non-supersymmetric gauge theories, or breaks its global chiral symmetries producing a large number of composite Nambu-Goldstone bosons relative to the number of underlying degrees of freedom. Thus either of these phases exhibits novel behavior.
@article{arxiv.1311.4889,
title = {Two-Color Theory with Novel Infrared Behavior},
author = {T. Appelquist and R. C. Brower and M. I. Buchoff and M. Cheng and G. T. Fleming and J. Kiskis and M. F. Lin and E. T. Neil and J. C. Osborn and C. Rebbi and D. Schaich and C. Schroeder and S. Syritsyn and G. Voronov and P. Vranas and O. Witzel},
journal= {arXiv preprint arXiv:1311.4889},
year = {2014}
}