A new proof technique establishes ergodicity for anti-symmetric skew products over symmetric IETs with non-logarithmic singularities and enables analysis of error terms in Birkhoff sums for locally Hamiltonian flows with non-perfect saddles.
Viana, Dynamics of Interval Exchange Transformations and Teichmüller Flows, lecture notes available from http://w3.impa.br/~viana/out/ietf.pdf
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On the ergodicity of anti-symmetric skew products with singularities and its applications
A new proof technique establishes ergodicity for anti-symmetric skew products over symmetric IETs with non-logarithmic singularities and enables analysis of error terms in Birkhoff sums for locally Hamiltonian flows with non-perfect saddles.