Two-color gauge theory with novel infrared behavior.
Using lattice simulations, we study the infrared behavior of a particularly interesting SU(2) gauge theory, with six massless Dirac fermions in the fundamental representation. We compute the running gauge coupling derived nonperturbatively from the Schrödinger functional of the theory, finding no evidence for an infrared fixed point up through gauge couplings g(2) of order 20. This implies that the theory either is governed in the infrared by a fixed point of considerable strength, unseen so far in nonsupersymmetric gauge theories, or breaks its global chiral symmetries producing a large number of composite Nambu-Goldstone bosons relative to the number of underlying degrees of freedom. Thus either of these phases exhibits novel behavior.
Department of Physics, Sloane Laboratory, Yale University, New Haven, Connecticut 06520, USA.
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T
Appelquist
Department of Physics, Boston University, Boston, Massachusetts 02215, USA.
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RC
Brower
Institute for Nuclear Theory, Box 351550, Seattle, Washington 98195-1550, USA.
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MI
Buchoff
Center for Computational Science, Boston University, Boston, Massachusetts 02215, USA.
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M
Cheng
Department of Physics, Sloane Laboratory, Yale University, New Haven, Connecticut 06520, USA.
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Fleming
Department of Physics, University of California, Davis, California 95616, USA.
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J
Kiskis
Computational Science Center, Brookhaven National Laboratory, Upton, New York 11973, USA.
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Lin
Department of Physics, University of Colorado, Boulder, Colorado 80309, USA and RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA.
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Neil
Argonne Leadership Computing Facility, Argonne, Illinois 60439, USA.
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JC
Osborn
Department of Physics, Boston University, Boston, Massachusetts 02215, USA.
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C
Rebbi
Department of Physics, Syracuse University, Syracuse, New York 13244, USA.
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D
Schaich
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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C
Schroeder
RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA.
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Syritsyn
Department of Physics, Sloane Laboratory, Yale University, New Haven, Connecticut 06520, USA.
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G
Voronov
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
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P
Vranas
Center for Computational Science, Boston University, Boston, Massachusetts 02215, USA.
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O
Witzel