Surface tension in finite-temperature quantum chromodynamics.
Surface tension in finite-temperature quantum chromodynamics.
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DOI：
10.1103/physrevd.42.2864
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发表时间：
1990-10
期刊：
影响因子：
--
通讯作者：
Huang;Potvin;Rebbi;Sanielevici
中科院分区：
文献类型：
--
作者：
Huang;Potvin;Rebbi;Sanielevici
In a first-order phase transition two phases can coexist at the critical point. The surface free energy {alpha}, associated with the interface separating the two phases, is an important parameter for the phenomenology of nucleation in supercooled matter and, more generally, for the whole dynamics of a system undergoing the phase transition. We report on a calculation of the surface tension in quenched QCD on lattices with volumes 6{sup 2}{times}12{times}2, 8{sup 2}{times}16{times}2, and 10{sup 2}{times}20{times}2, as well as on 8{sup 2}{times}16{times}4 and 12{sup 2}{times}24{times}4. Our results have been obtained from a Monte Carlo simulation where one half of the lattice is adiabatically brought from one phase to the other by applying a temperature gradient, and where the variation of free energy is calculated at the same time through the average of the action. For {ital N}{sub {ital t}}=2 lattices, we find {alpha}/{ital T}{sub {ital c}}{sup 3}=0.23(3) and 0.28(9) on 8{sup 2}{times}16 and 10{sup 2}{times}20 spatial volumes, respectively. On the other hand, the results from lattices with {ital N}{sub {ital t}}=4 are less well defined and are compatible with a vanishing surface tension. We discuss possible ways to improve the accuracy of the calculation with larger {ital N}{sub {ital t}}. Inmore » particular we propose the use of the Wilson action supplemented with external Polyakov fields as a way to enhance the formation of the interface.« less
In a first-order phase transition two phases can coexist at the critical point. The surface free energy {alpha}, associated with the interface separating the two phases, is an important parameter for the phenomenology of nucleation in supercooled matter and, more generally, for the whole dynamics of a system undergoing the phase transition. We report on a calculation of the surface tension in quenched QCD on lattices with volumes 6{sup 2}{times}12{times}2, 8{sup 2}{times}16{times}2, and 10{sup 2}{times}20{times}2, as well as on 8{sup 2}{times}16{times}4 and 12{sup 2}{times}24{times}4. Our results have been obtained from a Monte Carlo simulation where one half of the lattice is adiabatically brought from one phase to the other by applying a temperature gradient, and where the variation of free energy is calculated at the same time through the average of the action. For {ital N}{sub {ital t}}=2 lattices, we find {alpha}/{ital T}{sub {ital c}}{sup 3}=0.23(3) and 0.28(9) on 8{sup 2}{times}16 and 10{sup 2}{times}20 spatial volumes, respectively. On the other hand, the results from lattices with {ital N}{sub {ital t}}=4 are less well defined and are compatible with a vanishing surface tension. We discuss possible ways to improve the accuracy of the calculation with larger {ital N}{sub {ital t}}. Inmore » particular we propose the use of the Wilson action supplemented with external Polyakov fields as a way to enhance the formation of the interface.« less