Breakdown of Conformal Invariance at Strongly Random Critical Points

Details Breakdown of Conformal Invariance at Strongly Random Critical Points Breakdown of Conformal Invariance at Strongly Random Critical Points

2000-11-07

arxiv.org/abs/cond-mat/0011124v1

Phys. Rev. B 64, 94204 (2001).

Physics

Condensed Matter

Disordered Systems and Neural Networks

9 pages

Scientific paper

10.1103/PhysRevB.64.094204

We consider the breakdown of conformal and scale invariance in random systems with strongly random critical points. Extending previous results on one-dimensional systems, we provide an example of a three-dimensional system which has a strongly random critical point. The average correlation functions of this system demonstrate a breakdown of conformal invariance, while the typical correlation functions demonstrate a breakdown of scale invariance. The breakdown of conformal invariance is due to the vanishing of the correlation functions at the infinite disorder fixed point, causing the critical correlation functions to be controlled by a dangerously irrelevant operator describing the approach to the fixed point. We relate the computation of average correlation functions to a problem of persistence in the RG flow.

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