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Semiclassical resolvent estimates at trapped sets

Kiril Datchev, András Vasy (2012)

Annales de l’institut Fourier

We extend our recent results on propagation of semiclassical resolvent estimates through trapped sets when a priori polynomial resolvent bounds hold. Previously we obtained non-trapping estimates in trapping situations when the resolvent was sandwiched between cutoffs χ microlocally supported away from the trapping: χ R h ( E + i 0 ) χ = 𝒪 ( h - 1 ) , a microlocal version of a result of Burq and Cardoso-Vodev. We now allow one of the two cutoffs, χ ˜ , to be supported at the trapped set, giving χ R h ( E + i 0 ) χ ˜ = 𝒪 ( a ( h ) h - 1 ) when the a priori bound is χ ˜ R h ( E + i 0 ) χ ˜ = 𝒪 ( a ( h ) h - 1 ) .

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