The fate of Parisi-Sourlas supersymmetry in Random Field models

Abstract

By the Parisi-Sourlas conjecture, the critical point of a theory with random field (RF) disorder is described by a supersymmeric (SUSY) conformal field theory (CFT), related to a $d-2$ dimensional CFT without SUSY. Numerical studies indicate that this is true for the RF ${\varphi }^3$ model but not for RF ${\varphi }^4$ model in $d<5$ dimensions. Here we argue that the SUSY fixed point is not reached because of new relevant SUSY-breaking interactions. We use perturbative renormalization group in a judiciously chosen field basis, allowing systematic exploration of the space of interactions. Our computations agree with the numerical results for both cubic and quartic potential.

16 pages, 2 figures; minor modifications, version accepted for publication in PRL

References in corpus (2)

• Evidence for Supersymmetry in the Random-Field Ising Model at D = 5
• Absence of replica symmetry breaking in the random field Ising model

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