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In quantum field theory, the instanton fluid model is a model of Wick rotated Euclidean quantum chromodynamics. If we examine the path integral of the action, we find that it has infinitely many local minima, corresponding to varying instanton numbers. It turns out that the dominant contribution to the path integral comes from configurations consisting of a pool of instantons and antiinstantons. The exponential suppression coming from the increased action is compensated by the increased phase space factor coming from all the instantons. In other words, the "Euclidean" free energy is minimized by a pool of instantons.

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  • Instanton fluid (en)
  • Fluido instanton (pt)
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  • In quantum field theory, the instanton fluid model is a model of Wick rotated Euclidean quantum chromodynamics. If we examine the path integral of the action, we find that it has infinitely many local minima, corresponding to varying instanton numbers. It turns out that the dominant contribution to the path integral comes from configurations consisting of a pool of instantons and antiinstantons. The exponential suppression coming from the increased action is compensated by the increased phase space factor coming from all the instantons. In other words, the "Euclidean" free energy is minimized by a pool of instantons. (en)
  • Em cromodinâmica quântica, o modelo do fluido instanton é um modelo de rotação de Wick cromodinâmica quântica euclidiana. Se examinarmos a integração funcional da ação, descobrimos que ela tem infinitamente muitos mínimos locais correspondentes a um número variado de instantons. Acontece que a contribuição dominante para a integração funcional vem de configurações com composto de um grupo de instantons e antiinstantons. A supressão exponencial proveniente da ação aumentada é compensada pelo aumento do fator de espaço fásico vindo de todos os instantons. Em outras palavras, a livre energia "euclidiana" é minimizada por um conjunto de instantons. (pt)
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  • In quantum field theory, the instanton fluid model is a model of Wick rotated Euclidean quantum chromodynamics. If we examine the path integral of the action, we find that it has infinitely many local minima, corresponding to varying instanton numbers. It turns out that the dominant contribution to the path integral comes from configurations consisting of a pool of instantons and antiinstantons. The exponential suppression coming from the increased action is compensated by the increased phase space factor coming from all the instantons. In other words, the "Euclidean" free energy is minimized by a pool of instantons. We also know that in the presence of an instanton, left-handed quarks of each flavor will be produced and right-handed quarks annihilated. This evidently will have consequences to the chiral dynamics of the theory. (en)
  • Em cromodinâmica quântica, o modelo do fluido instanton é um modelo de rotação de Wick cromodinâmica quântica euclidiana. Se examinarmos a integração funcional da ação, descobrimos que ela tem infinitamente muitos mínimos locais correspondentes a um número variado de instantons. Acontece que a contribuição dominante para a integração funcional vem de configurações com composto de um grupo de instantons e antiinstantons. A supressão exponencial proveniente da ação aumentada é compensada pelo aumento do fator de espaço fásico vindo de todos os instantons. Em outras palavras, a livre energia "euclidiana" é minimizada por um conjunto de instantons. Sabemos também que, na presença de um Instanton, quarks canhotos de cada sabor serão produzidos e destros quarks aniquilados. Isso, evidentemente, terá consequências para as dinâmicas quirais da teoria. (pt)
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