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Hadronic spectral functions of tau decays have been used in the past to
provide an alternative determination of the LO Hadronic Vacuum
Polarization relevant for the muon (g-2). Following recent developments
and results in Lattice QCD+QED calculations, I will present a study of
the isospin breaking corrections of tau spectral functions from first
principles at physical pion mass, based on gauge field configurations
generated by the RBC/UKQCD collaboration. I will then discuss
comparisons with previous phenomenological determinations and
experimental results, together with future prospects.