Several questions and hypotheses concerning the limit polynomials for   Chacon transformation
  We study the weak closure $L$ of powers $T^k$ of the non-singular Chacon transformation $T$ with 2-cuts. This is still an open question does $L$ contain any Markov operator except an orthogonal projector to the constants $\Theta$ and some polynomials $P(T)$? In this paper we calculate a particular set of limit polynomials $P_m(T) = \lim_{n \to \infty} T^{-mh_n}$, where $m$ is a fixed integer number and $h_n = (3^n-1)/2$ are the sequence of heights of towers in a standard rank one representation of the Chacon map. We show that for any $d \ge 2$ the family of limit polynomials contains infinitely many distinct polynomials of degree $d$. We also formulate hyposeses and open questions concerning the sequence $P_m$ and the entire set $L$. 
A. A. Prikhodko, V. V. Ryzhikov
math.DS math.NT