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Title: Theta, time reversal and temperature

Abstract

SU(N) gauge theory is time reversal invariant at θ = 0 and θ = π. We show that at θ = π there is a discrete ’t Hooft anomaly involving time reversal and the center symmetry. This anomaly leads to constraints on the vacua of the theory. It follows that at θ = π the vacuum cannot be a trivial non-degenerate gapped state. (By contrast, the vacuum at θ = 0 is gapped, non-degenerate, and trivial.) Due to the anomaly, the theory admits nontrivial domain walls supporting lower-dimensional theories. Depending on the nature of the vacuum at θ = π, several phase diagrams are possible. Assuming area law for space-like loops, one arrives at an inequality involving the temperatures at which CP and the center symmetry are restored. We also analyze alternative scenarios for SU(2) gauge theory. The underlying symmetry at θ = π is the dihedral group of 8 elements. If deconfined loops are allowed, one can have two O(2)-symmetric fixed points. In conclusion, it may also be that the four-dimensional theory around θ = π is gapless, e.g. a Coulomb phase could match the underlying anomalies.

Authors:
 [1];  [2];  [3];  [4]
  1. Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  3. Weizmann Institute of Science, Rehovot (Israel)
  4. Institute for Advanced Study, Princeton, NJ (United States)
Publication Date:
Research Org.:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1389778
Grant/Contract Number:  
SC0011632; SC0009988
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 5; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Anomalies in Field and String Theories; Confinement; Spontaneous Symmetry Breaking; Wilson; ’t Hooft and Polyakov loops

Citation Formats

Gaiotto, Davide, Kapustin, Anton, Komargodski, Zohar, and Seiberg, Nathan. Theta, time reversal and temperature. United States: N. p., 2017. Web. doi:10.1007/JHEP05(2017)091.
Gaiotto, Davide, Kapustin, Anton, Komargodski, Zohar, & Seiberg, Nathan. Theta, time reversal and temperature. United States. doi:10.1007/JHEP05(2017)091.
Gaiotto, Davide, Kapustin, Anton, Komargodski, Zohar, and Seiberg, Nathan. Wed . "Theta, time reversal and temperature". United States. doi:10.1007/JHEP05(2017)091. https://www.osti.gov/servlets/purl/1389778.
@article{osti_1389778,
title = {Theta, time reversal and temperature},
author = {Gaiotto, Davide and Kapustin, Anton and Komargodski, Zohar and Seiberg, Nathan},
abstractNote = {SU(N) gauge theory is time reversal invariant at θ = 0 and θ = π. We show that at θ = π there is a discrete ’t Hooft anomaly involving time reversal and the center symmetry. This anomaly leads to constraints on the vacua of the theory. It follows that at θ = π the vacuum cannot be a trivial non-degenerate gapped state. (By contrast, the vacuum at θ = 0 is gapped, non-degenerate, and trivial.) Due to the anomaly, the theory admits nontrivial domain walls supporting lower-dimensional theories. Depending on the nature of the vacuum at θ = π, several phase diagrams are possible. Assuming area law for space-like loops, one arrives at an inequality involving the temperatures at which CP and the center symmetry are restored. We also analyze alternative scenarios for SU(2) gauge theory. The underlying symmetry at θ = π is the dihedral group of 8 elements. If deconfined loops are allowed, one can have two O(2)-symmetric fixed points. In conclusion, it may also be that the four-dimensional theory around θ = π is gapless, e.g. a Coulomb phase could match the underlying anomalies.},
doi = {10.1007/JHEP05(2017)091},
journal = {Journal of High Energy Physics (Online)},
number = 5,
volume = 2017,
place = {United States},
year = {2017},
month = {5}
}

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    Works referencing / citing this record:

    Anomaly-Induced Transport Phenomena from Imaginary-Time Formalism
    journal, May 2019


    Gauge enhanced quantum criticality and time reversal deconfined domain wall: SU(2) Yang-Mills dynamics with topological terms
    journal, February 2020


    Anomaly-Induced Transport Phenomena from Imaginary-Time Formalism
    journal, May 2019