Conformal symmetry and composite operators in the O(N)3 tensor field theory

We continue the study of the bosonic O(N )3 model with quartic interactions and long-range propagator. The symmetry group allows for three distinct invariant 𝜙4 composite operators, known as tetrahedron, pillow and double-trace. As shown in [1, 2], the tetrahedron operator is exactly marginal in the...

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Hauptverfasser: Benedetti, Dario (VerfasserIn) , Gurǎu, Rǎzvan (VerfasserIn) , Suzuki, Kenta (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: June 17, 2020
In: Journal of high energy physics
Year: 2020, Heft: 6, Pages: 1-50
ISSN:1029-8479
DOI:10.1007/JHEP06(2020)113
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP06(2020)113
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Verfasserangaben:Dario Benedetti, Razvan Gurau and Kenta Suzuki

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520 |a We continue the study of the bosonic O(N )3 model with quartic interactions and long-range propagator. The symmetry group allows for three distinct invariant 4 composite operators, known as tetrahedron, pillow and double-trace. As shown in [1, 2], the tetrahedron operator is exactly marginal in the large-N limit and for a purely imaginary tetrahedron coupling a line of real infrared fixed points (parametrized by the absolute value of the tetrahedron coupling) is found for the other two couplings. These fixed points have real critical exponents and a real spectrum of bilinear operators, satisfying unitarity constraints. This raises the question whether at large-N the model is unitary, despite the tetrahedron coupling being imaginary. 
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