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: https://arxiv.org/abs/1907.08221v1
Date submitted: 2019-08-06
Submitted by: Tong, David
Submitted to: SciPost Physics
Domain(s): Theoretical
Subject area: Quantum Physics

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) 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.

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

Strengths

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

Report

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

typos:
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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