Scaling of the Lyapunov exponent at a balanced hyperbolic critical point

TL;DR

This paper analyzes the behavior of the Lyapunov exponent at balanced hyperbolic critical points, revealing an inverse logarithmic scaling and providing explicit coefficients, with implications for various physical models.

Contribution

It introduces a detailed analysis of the Lyapunov exponent scaling at balanced hyperbolic critical points and computes explicit coefficients for the inverse logarithmic increase.

Findings

Lyapunov exponent vanishes at zero energy in certain models.

The inverse logarithmic increase of the Lyapunov exponent is explicitly characterized.

The approach applies to the free energy density of the random field Ising model and similar critical points.

Abstract

In both the random hopping model and at topological phase transitions in one-dimensional chiral systems, the Lyapunov exponent vanishes at zero energy, but is here shown to have an inverse logarithmic increase with a coefficient that is computed explicitly. This is the counterpart of the Dyson spike in the density of states. The argument also transposes to the free energy density of the random field Ising model, and more generally to many so-called balanced hyperbolic critical points. It is based on the fact that the Furstenberg measure in rescaled logarithmic Dyson-Schmidt variables can be well-approximated by an absolutely continuous measure with trapezoidal density.