We construct maps T on the interval and on the circle which are Lebesgue exact preserving an absolutely continuous infinite measure μ ≪ λ, such that for any probability measure ν ≪ λ the sequence of arithmetical averages of image measures does not converge weakly.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-cm93-2-9, author = {Roland Zweim\"uller}, title = {Exact $^{$\infty$}$ covering maps of the circle without (weak) limit measure}, journal = {Colloquium Mathematicae}, volume = {91}, year = {2002}, pages = {295-302}, zbl = {1041.37005}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm93-2-9} }
Roland Zweimüller. Exact $^{∞}$ covering maps of the circle without (weak) limit measure. Colloquium Mathematicae, Tome 91 (2002) pp. 295-302. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-cm93-2-9/