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Euclidean Spinors and Twistor Unification

by Peter Woit

Submission summary

As Contributors: Peter Woit
Arxiv Link: https://arxiv.org/abs/2104.05099v1 (pdf)
Date submitted: 2021-04-26 22:43
Submitted by: Woit, Peter
Submitted to: SciPost Physics
Academic field: Physics
Specialties:
  • High-Energy Physics - Theory
  • Mathematical Physics
Approach: Theoretical

Abstract

We argue that the necessity of picking an imaginary time direction for the analytic continuation to Minkowski signature gives a new point of view on the problem of Euclidean spinor fields, allowing an interpretation in Minkowski space-time of one of the chiral factors of Spin(4)=SU(2)xSU(2) as an internal symmetry. The imaginary time direction spontaneously breaks this SU(2), playing the role of the Higgs Field. Twistor geometry provides a compelling framework for formulating spinor fields in complexified four-dimensional space-time and implementing the above suggestion. Projective twistor space PT naturally includes an internal SU(3) symmetry as well as the above SU(2), and spinors on this space behave like a generation of leptons. Since only one chirality of the Euclidean Spin(4) is a space-time symmetry after analytic continuation and the Higgs field defines the imaginary time direction, the space-time geometry degrees of freedom are only a chiral SU(2) connection and a spatial frame. These may allow a consistent quantization of gravity in a chiral formulation, unified in the twistor framework with the degrees of freedom of the Standard Model. This unification proposal is incomplete, still requiring implementation as a theory with gauge symmetry on PT, perhaps related to known correspondences between super Yang-Mills theories and supersymmetric holomorphic Chern-Simons theories on PT.

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Submission 2104.05099v1 on 26 April 2021

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