SciPost Submission Page

If the Weak Were Strong and the Strong Were Weak

by Nakarin Lohitsiri, David Tong

This is not the current version.

Submission summary

As Contributors: David Tong
Arxiv Link: (pdf)
Date submitted: 2019-08-06
Submitted by: Tong, David
Submitted to: SciPost Physics
Discipline: Physics
Subject area: Quantum Physics
Approach: Theoretical


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) x Sp(r) x 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.

Ontology / Topics

See full Ontology or Topics database.

Down quark Gauge theory Standard Model
Current status:
Has been resubmitted

Submission & Refereeing History

Resubmission 1907.08221v2 on 28 September 2019
Submission 1907.08221v1 on 6 August 2019

Reports on this Submission

Anonymous Report 2 on 2019-9-19 Invited Report

  • Cite as: Anonymous, Report on arXiv:1907.08221v1, delivered 2019-09-19, doi: 10.21468/SciPost.Report.1190


1. Clear and well written
2. answers an interesting question with interesting results


The authors study what happens when the weak interactions of the standard model (and a variety of closely related models) become stronger than the strong interactions. The find that the low energy physics is smooth for one generation but has either a discontinuity or intermediate phase for more than one generation. This is a delightful paper and should certainly be published.

Requested changes

1. it would be nice for younger readers if the authors could provide references for `t Hooft anomaly matching and the SU(2) anomaly discussed at the bottom of page four

2. "describes" near the bottom of page three has an extra "s"
3. page nine: "this is condensate in breaks" should be "this condensate breaks"
4. bottom of page thirteen: "The are" should be "They are"

  • validity: top
  • significance: high
  • originality: high
  • clarity: top
  • formatting: excellent
  • grammar: excellent

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