On the ergodicity of infinite antisymmetric extensions of symmetric IETs

Abstract: In this article, we consider skew product extensions over symmetric interval exchange transformations with respect to the cocycle $f(x)=\chi_{(0,1/2)}-\chi_{(1/2,1)}$. More precisely, we prove that for almost every interval exchange transformation $T$ with symmetric combinatorial data, the skew product $T_f: [0, 1) \times \mathbb Z \to [0, 1) \times \mathbb Z$ given by $T_f(x,r)=(T(x),r+f(x))$ is ergodic with respect to the product of the Lebesgue and counting measure.