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5 papers · 2 filters
Rigorous Limits on the Interaction Strength in Quantum Field Theory
Francesco Caracciolo, Slava Rychkov
We derive model-independent, universal upper bounds on the Operator Product Expansion (OPE) coefficients in unitary 4-dimensional Conformal Field Theories. The method uses the conf…
Energy's and amplitudes' positivity
Alberto Nicolis, Riccardo Rattazzi, Enrico Trincherini
In QFT, the null energy condition (NEC) for a classical field configuration is usually associated with that configuration's stability against small perturbations, and with the sub-…
Chiral symmetry breaking and theta vacuum structure in QCD
G. Morchio, F. Strocchi
The solution of the axial U(1) problem, the role of the topology of the gauge group in forcing the breaking of axial symmetry in any irreducible representation of the observable al…
Universal Constraints on Conformal Operator Dimensions
Vyacheslav S. Rychkov, Alessandro Vichi
We continue the study of model-independent constraints on the unitary Conformal Field Theories in 4-Dimensions, initiated in arXiv:0807.0004. Our main result is an improved upper b…
Unconstrained Higher Spins of Mixed Symmetry. II. Fermi Fields
Andrea Campoleoni, Dario Francia, Jihad Mourad +1
This paper is a sequel of arXiv:0810.4350 [hep-th], and is also devoted to the local "metric-like" unconstrained Lagrangians and field equations for higher-spin fields of mixed sym…