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• W2967404501 abstract "We present the first numerical study of the ultraviolet dynamics of non-asymptotically free gauge-fermion theories at large number of matter fields. As testbed theories we consider non-abelian SU(2) gauge theories with 24 and 48 Dirac fermions on the lattice. For these number of flavors asymptotic freedom is lost and the theories are governed by a gaussian fixed point at low energies. In the ultraviolet they can develop a physical cutoff and therefore be trivial, or achieve an interacting safe fixed point and therefore be fundamental at all energy scales. We demonstrate that the gradient flow method can be successfully implemented and applied to determine the renormalized running coupling when asymptotic freedom is lost. Additionally, we prove that our analysis is connected to the gaussian fixed point as our results nicely match with the perturbative beta function. Intriguingly, we observe that it is hard to achieve large values of the renormalized coupling on the lattice. This might be an early sign of the existence of a physical cutoff and imply that a larger number of flavors is needed to achieve the safe fixed point. A more conservative interpretation of the results is that the current lattice action is unable to explore the deep ultraviolet region where safety might emerge. Our work constitutes an essential step towards determining the ultraviolet fate of non asymptotically free gauge theories." @default.
• W2967404501 created "2019-08-22" @default.
• W2967404501 creator A5013107443 @default.
• W2967404501 creator A5036271638 @default.
• W2967404501 creator A5058793856 @default.
• W2967404501 creator A5076153407 @default.
• W2967404501 creator A5083543613 @default.
• W2967404501 date "2020-04-10" @default.
• W2967404501 modified "2023-10-15" @default.
• W2967404501 title "Safety versus triviality on the lattice" @default.
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• W2967404501 doi "https://doi.org/10.1103/physrevd.101.074508" @default.
• W2967404501 hasPublicationYear "2020" @default.
• W2967404501 type Work @default.
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