If the Weak Were Strong and Strong Were Weak
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Peer-reviewed
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Abstract
We explore the phase structure of the Standard Model as the relative strengths of the SU(2) weak force and SU(3) strong force are varied. With a single generation of fermions, the structure of chiral symmetry breaking suggests that there is no phase transition as we interpolate between the SU(3)-confining phase and the SU(2)-confining phase. Remarkably, the massless left-handed neutrino, familiar in our world, morphs smoothly into a massless right-handed down-quark. With multiple generations, a similar metamorphosis occurs, but now proceeding via a phase transition. In the second half of the paper we introduce a two-parameter extension of the Standard Model, a chiral gauge theory with gauge group U(1) × Sp(r ) × SU(N). We again explore the phase structure of the theory as the relative strengths of the Sp(r ) and SU(N) gauge couplings vary.
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2542-4653
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Science and Technology Facilities Council (ST/P000681/1)
Simons Foundation (567525)