Rindlisbacher Tobias, Rummukainen Kari, Salami Ahmed, Tuominen Kimmo
Albert Einstein Center for Fundamental Physics and Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland.
Department of Physics and Helsinki Institute of Physics, P.O. Box 64, FI-00014 University of Helsinki, Finland.
Phys Rev Lett. 2022 Sep 23;129(13):131601. doi: 10.1103/PhysRevLett.129.131601.
SU(2) gauge theory with N_{f}=24 massless fermions is noninteracting at long distances, i.e., it has an infrared fixed point at vanishing coupling. With massive fermions, the fermions are expected to decouple at energy scales below the fermion mass, and the infrared behavior is that of confining SU(2) pure gauge theory. We demonstrate this behavior nonperturbatively with lattice Monte Carlo simulations by measuring the gradient flow running coupling.
具有(N_f = 24)个无质量费米子的(SU(2))规范理论在长距离下是非相互作用的，即它在耦合为零时具有一个红外不动点。对于有质量的费米子，预计费米子在低于费米子质量的能量尺度下解耦，并且红外行为是禁闭(SU(2))纯规范理论的行为。我们通过测量梯度流跑动耦合，用格点蒙特卡罗模拟非微扰地证明了这种行为。
