Conformal windows beyond asymptotic freedom

Bond, Andrew D, Litim, Daniel F and Medina Vazquez, Gustavo (2021) Conformal windows beyond asymptotic freedom. Physical Review D, 104 (10). a105002 1-20. ISSN 2470-0010

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We study four-dimensional gauge theories coupled to fermions in the fundamental and mesonlike scalars. All requisite beta functions are provided for general gauge group and fermion representation. In the regime where asymptotic freedom is absent, we determine all interacting fixed points using perturbation theory up to three loop in the gauge and two loop in the Yukawa and quartic couplings. We find that the conformal window of ultraviolet fixed points is narrowed down by finite-N corrections beyond the Veneziano limit. We also find a new infrared fixed point whose main features, such as scaling exponents, UV-IR connecting trajectories, and phase diagram, are provided. Both fixed points collide upon varying the number of fermion flavors Nf, and conformality is lost through a saddle-node bifurcation. We further revisit the prospect for ultraviolet fixed points in the large-Nf limit where matter field fluctuations dominate. Unlike at weak coupling, we do not find clear evidence for new scaling solutions even in the presence of scalar and Yukawa couplings.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 04 Nov 2021 08:44
Last Modified: 03 Mar 2022 11:27

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Project NameSussex Project NumberFunderFunder Ref
South-Eastern Particle Theory Alliance Sussex - RHUL - UCL 2017-2020 - Sussex nodeG2074STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/P000819/1
South-Eastern Particle Theory Alliance Sussex - RHUL - UCL 2020-2023 - Sussex nodeG2836STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/T00102X/1