Chaos from Massive Deformations of Yang-Mills Matrix Models

Abstract

We focus on an $SU(N)$ Yang-Mills gauge theory in $0+1$-dimensions with the same matrix content as the bosonic part of the BFSS matrix model, but with mass deformation terms breaking the global $SO(9)$ symmetry of the latter to $SO(5)\times SO(3)\times {\mathbb{Z}}_2$. Introducing an ansatz configuration involving fuzzy four and two spheres with collective time dependence, we examine the chaotic dynamics in a family of effective Lagrangians obtained by tracing over the aforementioned ansatz configurations at the matrix levels $N=\frac{1}{6}(n+1)(n+2)(n+3)$, for $n=1,2,\cdots ,7$. Through numerical work, we determine the Lyapunov spectrum and analyze how the largest Lyapunov exponents(LLE) change as a function of the energy, and discuss how our results can be used to model the temperature dependence of the LLEs and put upper bounds on the temperature above which LLE values comply with the Maldacena-Shenker-Stanford (MSS) bound $2\pi T$ , and below which it will eventually be violated.

arXiv comment32+1 pages, 7 tables, 6 figures. Expanded discussion in section 3 establishing upper bound on temperature above which largest Lyapunov exponent complies with the MSS bound, published version

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