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Title: Bose-Fermi degeneracies in large N adjoint QCD

Abstract

Here, we analyze the large N limit of adjoint QCD, an SU(N) gauge theory with N f flavors of massless adjoint Majorana fermions, compactified on S3 × S1. We focus on the weakly-coupled confining small-S3 regime. If the fermions are given periodic boundary conditions on S1, we show that there are large cancellations between bosonic and fermionic contributions to the twisted partition function. These cancellations follow a pattern previously seen in the context of misaligned supersymmetry, and lead to the absence of Hagedorn instabilities for any S1 size L, even though the bosonic and fermionic densities of states both have Hagedorn growth. Adjoint QCD stays in the confining phase for any L ~ N0, explaining how it is able to enjoy large N volume independence for any L. The large N boson-fermion cancellations take place in a setting where adjoint QCD is manifestly non-supersymmetric at any finite N, and are consistent with the recent conjecture that adjoint QCD has emergent fermionic symmetries in the large N limit.

Authors:
 [1];  [2];  [3]
  1. Univ. of Maryland, College Park, MD (United States). Dept. of Physics; Stony Brook Univ., Stony Brook, NY (United States). Dept. of Physics and Astronomy
  2. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
  3. Princeton Univ., Princeton, NJ (United States). Dept. of Physics; Univ. of Tokyo, Chiba (Japan). Kavli IPMU
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1454582
Grant/Contract Number:  
SC0011842; FG02-88ER40388; FG02-93ER40762
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: 2015; Journal Issue: 7; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Confinement; 1/N Expansion

Citation Formats

Basar, Gokce, Cherman, Aleksey, and McGady, David. Bose-Fermi degeneracies in large N adjoint QCD. United States: N. p., 2015. Web. doi:10.1007/JHEP07(2015)016.
Basar, Gokce, Cherman, Aleksey, & McGady, David. Bose-Fermi degeneracies in large N adjoint QCD. United States. https://doi.org/10.1007/JHEP07(2015)016
Basar, Gokce, Cherman, Aleksey, and McGady, David. Mon . "Bose-Fermi degeneracies in large N adjoint QCD". United States. https://doi.org/10.1007/JHEP07(2015)016. https://www.osti.gov/servlets/purl/1454582.
@article{osti_1454582,
title = {Bose-Fermi degeneracies in large N adjoint QCD},
author = {Basar, Gokce and Cherman, Aleksey and McGady, David},
abstractNote = {Here, we analyze the large N limit of adjoint QCD, an SU(N) gauge theory with N f flavors of massless adjoint Majorana fermions, compactified on S3 × S1. We focus on the weakly-coupled confining small-S3 regime. If the fermions are given periodic boundary conditions on S1, we show that there are large cancellations between bosonic and fermionic contributions to the twisted partition function. These cancellations follow a pattern previously seen in the context of misaligned supersymmetry, and lead to the absence of Hagedorn instabilities for any S1 size L, even though the bosonic and fermionic densities of states both have Hagedorn growth. Adjoint QCD stays in the confining phase for any L ~ N0, explaining how it is able to enjoy large N volume independence for any L. The large N boson-fermion cancellations take place in a setting where adjoint QCD is manifestly non-supersymmetric at any finite N, and are consistent with the recent conjecture that adjoint QCD has emergent fermionic symmetries in the large N limit.},
doi = {10.1007/JHEP07(2015)016},
journal = {Journal of High Energy Physics (Online)},
number = 7,
volume = 2015,
place = {United States},
year = {Mon Jul 06 00:00:00 EDT 2015},
month = {Mon Jul 06 00:00:00 EDT 2015}
}

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