Native ultrametricity of sparse random ensembles

Autor:	Avetisov, V., Krapivsky, P. L., Nechaev, S.
Rok vydání:	2015
Předmět:	Condensed Matter - Disordered Systems and Neural Networks Condensed Matter - Statistical Mechanics Mathematics - Number Theory
Druh dokumentu:	Working Paper
DOI:	10.1088/1751-8113/49/3/035101
Popis:	We investigate the eigenvalue density in ensembles of large sparse Bernoulli random matrices. We demonstrate that the fraction of linear subgraphs just below the percolation threshold is about 95\% of all finite subgraphs, and the distribution of linear chains is purely exponential. We analyze in detail the spectral density of ensembles of linear subgraphs, discuss its ultrametric nature and show that near the spectrum boundary, the tail of the spectral density exhibits a Lifshitz singularity typical for Anderson localization. We also discuss an intriguing connection of the spectral density to the Dedekind $\eta$-function. We conjecture that ultrametricity is inherit to complex systems with extremal sparse statistics and argue that a number-theoretic ultrametricity emerges in any rare-event statistics. Comment: 24 pages, 9 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1506.05037 Zobrazit plný text záznamu View this record from Arxiv