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arXiv 1808.02767cond-mat.stat-mechcond-mat.dis-nn
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de Almeida-Elderless-Gardner普适类的重整化群流的形态学

Morphology of renormalization-group flow for the de Almeida-Thouless-Gardner universality class

Patrick Charbonneau, Yi Hu, Archishman Raju, James P. Sethna, Sho Yaida

摘要:

预测了在无序介质中的复制对称破缺相变。然而,由于在单圈阶的重整化群流中没有临界不动点,在其上临界维数6以下,过渡的临界性长期以来一直受到质疑。最近的一个双回路分析揭示了一个可能的强耦合不动点,但由于在强耦合制度的扰动分析的不受控制的性质,争论仍然存在。在这里,我们研究的性质的过渡作为一个函数的空间维度,并表明,强耦合不动点可以通过一个Hopf分叉,导致在一个临界极限环和随之而来的离散尺度不变性。我们进一步研究了一个不同的重整化方案,并认为强耦合不动点/极限环的吸引盆可能因此保持有限的所有维度。

英文摘要:

A replica-symmetry-breaking phase transition is predicted in a host of disordered media. The criticality of the transition has, however, long been questioned below its upper critical dimension, six, due to the absence of a critical fixed point in the renormalization-group flows at one-loop order. A recent two-loop analysis revealed a possible strong-coupling fixed point but, given the uncontrolled nature of perturbative analysis in the strong-coupling regime, debate persists. Here we examine the nature of the transition as a function of spatial dimension and show that the strong-coupling fixed point can go through a Hopf bifurcation, resulting in a critical limit cycle and a concomitant discrete scale invariance. We further investigate a different renormalization scheme and argue that the basin of attraction of the strong-coupling fixed point/limit cycle may thus stay finite for all dimensions.

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