AG Mathematische Stochastik : - Neil Manibo

Jun 07
07-06-2023 16:15 Uhr bis 18:15 Uhr
Raum : 04.363

Title: Ghost measures and the finiteness conjecture for matrices


In 1995, Lagarias and Wang asked whether, given a finite set S of real matrices,
there is always a finite product of matrices from S which realises the joint
spectral radius of S. The general conjecture has been shown to be false for real
matrices, but it remains open for matrices with rational/integer entries.
Regular sequences, which are sequences arising from a finite set a matrices, are
intimately related to this question. In this talk, we will discuss how to build
probability measures on [0,1) from regular sequences, and show that for a
specific class of matrices, the finiteness property is equivalent to spectral
properties of the derived measures. This is based on joint work with Michael
Coons, James Evans, and Philipp Gohlke.