# Dispersive estimates with loss of derivatives via the heat semigroup and the wave operator

Abstract : This paper aims to give a general (possibly compact or noncompact) analog of Strichartz inequalities with loss of derivatives, obtained by Burq, Gérard, and Tzvetkov [19] and Staffilani and Tataru [51]. Moreover we present a new approach, relying only on the heat semigroup in order to understand the analytic connexion between the heat semigroup and the unitary Schrödinger group (both related to a same self-adjoint operator). One of the novelty is to forget the endpoint $L^1-L^\infty$ dispersive estimates and to look for a weaker $H^1-BMO$ estimates (Hardy and BMO spaces both adapted to the heat semigroup). This new point of view allows us to give a general framework (infinite metric spaces, Riemannian manifolds with rough metric, manifolds with boundary,...) where Strichartz inequalities with loss of derivatives can be reduced to microlocalized $L^2-L^2$ dispersive properties. We also use the link between the wave propagator and the unitary Schrödinger group to prove how short time dispersion for waves implies dispersion for the Schrödinger group.
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Journal articles
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https://hal.archives-ouvertes.fr/hal-01024258
Contributor : Valentin Samoyeau <>
Submitted on : Tuesday, July 15, 2014 - 6:13:26 PM
Last modification on : Monday, March 25, 2019 - 4:52:05 PM
Long-term archiving on : Tuesday, December 2, 2014 - 9:31:32 AM

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• HAL Id : hal-01024258, version 1
• ARXIV : 1407.4086

### Citation

Frederic Bernicot, Valentin Samoyeau. Dispersive estimates with loss of derivatives via the heat semigroup and the wave operator. Annali della Scuola Normale Superiore di Pisa, 2017, XVII (5), pp.969-1029. ⟨hal-01024258⟩

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