We continue our study of bilinear estimates on waveguide R× T started in {DFYZZ2024,Deng2023}. The main point of the current article is, comparing to previous work {Deng2023}, that we obtain estimates beyond the semiclassical time regime. Our estimate is sharp in the sense that one can construct examples which saturate this estimate.
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Deng et al. (2024) studied this question.
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