If the Weak Were Strong and Strong Were Weak
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Tong, D., & Lohitsiri, N. (2019). If the Weak Were Strong and Strong Were Weak. SciPost Physics, 7 (5. 059)https://doi.org/10.21468/SciPostPhys.7.5.059
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.
We are supported by the STFC consolidated grant ST/P000681/1. DT is a Wolfson Royal Society Research Merit Award holder and is supported by a Simons Investigator Award. NL is supported by the Internal Graduate Scholarship from Trinity College, Cambridge, and by the Thai Government.
Royal Society (WM160059)
Simons Foundation (567525)
External DOI: https://doi.org/10.21468/SciPostPhys.7.5.059
This record's URL: https://www.repository.cam.ac.uk/handle/1810/298807
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/