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arXiv 1411.3142math-phmath.MP
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KPZ普适类中的点相互作用布朗运动

Point-interacting Brownian motions in the KPZ universality class

Tomohiro Sasamoto, Herbert Spohn

摘要:

我们讨论相互作用的布朗运动链。它们的时间反演不变性被打破,因为左右邻居之间的相互作用强度的不对称性。在一个非常陡和短程势的极限下,我们得到带有斜反射的布朗运动。对于这个模型,我们证明了转移概率和自对偶的Bethe ansatz公式。在半泊松初始数据的情况下,对偶性用于在任何正时间到达某个参考点左侧的粒子数的生成函数的Fredholm行列式。这个行列式的形式渐近性建立了与Kardar-Parisi-Zhang普适类的联系。

英文摘要:

We discuss chains of interacting Brownian motions. Their time reversal invariance is broken because of asymmetry in the interaction strength between left and right neighbor. In the limit of a very steep and short range potential one arrives at Brownian motions with oblique reflections. For this model we prove a Bethe ansatz formula for the transition probability and self-duality. In case of half-Poisson initial data, duality is used to arrive at a Fredholm determinant for the generating function of the number of particles to the left of some reference point at any positive time. A formal asymptotics for this determinant establishes the link to the Kardar-Parisi-Zhang universality class.

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