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Continuous renormalization group β function from lattice simulations
Hasenfratz, Anna ; Witzel, Oliver
Physical review. D, 2020-02, Vol.101 (3), Article 034514
[Periódico revisado por pares]
College Park: American Physical Society
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Título:
Continuous renormalization group β function from lattice simulations
Autor:
Hasenfratz, Anna
;
Witzel, Oliver
Assuntos:
Continuity (mathematics)
;
Fixed points (mathematics)
;
Flavor (particle physics)
;
gauge theories
;
Gradient flow
;
lattice field theory
;
Mathematical analysis
;
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
;
Quantum chromodynamics
;
renormalization group
É parte de:
Physical review. D, 2020-02, Vol.101 (3), Article 034514
Notas:
SC0010005; ACI-1532235; ACI-1532236; ACI-1548562; AC02-05CH11231
USDOE Office of Science (SC), High Energy Physics (HEP)
National Science Foundation (NSF)
Descrição:
We present a real-space renormalization group transformation with continuous scale change to calculate the continuous renormalization group β function in nonperturbative lattice simulations. Our method is motivated by the connection between Wilsonian renormalization group and the gradient flow transformation. It does not rely on the perturbative definition of the renormalized coupling and is also valid at nonperturbative fixed points. Although our method requires an additional extrapolation compared to traditional step scaling calculations, it has several advantages which compensates for this extra step even when applied in the vicinity of the perturbative fixed point. We illustrate our approach by calculating the β function of 2-flavor QCD and show that lattice predictions from individual lattice ensembles, even without the required continuum and finite volume extrapolations, can be very close to the result of the full analysis. Thus our method provides a nonperturbative framework and intuitive understanding into the structure of strongly coupled systems, in addition to being complementary to existing lattice determinations.
Editor:
College Park: American Physical Society
Idioma:
Inglês
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