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Transactions of the American Mathematical Society

ISSN 1088-6850(online) ISSN 0002-9947(print)



Dispersive estimates for Schrödinger operators in dimension two with obstructions at zero energy

Authors: M. Burak Erdoğan and William R. Green
Journal: Trans. Amer. Math. Soc. 365 (2013), 6403-6440
MSC (2010): Primary 35J10
Published electronically: April 18, 2013
MathSciNet review: 3105757
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Abstract: We investigate $L^1(\mathbb {R}^2)\to L^\infty (\mathbb {R}^2)$ dispersive estimates for the Schrödinger operator $H=-\Delta +V$ when there are obstructions, resonances or an eigenvalue, at zero energy. In particular, we show that the existence of an s-wave resonance at zero energy does not destroy the $t^{-1}$ decay rate. We also show that if there is a p-wave resonance or an eigenvalue at zero energy, then there is a time dependent operator $F_t$ satisfying $\|F_t\|_{L^1\to L^\infty } \lesssim 1$ such that \[ \|e^{itH}P_{ac}-F_t\|_{L^1\to L^\infty } \lesssim |t|^{-1}, \text { for } |t|>1.\] We also establish a weighted dispersive estimate with $t^{-1}$ decay rate in the case when there is an eigenvalue at zero energy but no resonances.

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Additional Information

M. Burak Erdoğan
Affiliation: Department of Mathematics, University of Illinois, Urbana, Illinois 61801

William R. Green
Affiliation: Department of Mathematics and Computer Science, Eastern Illinois University, Charleston, Illinois 61920
Address at time of publication: Department of Mathematics, Rose-Hulman Institute of Technology, Terre Haute, Indiana 47803
MR Author ID: 906481
ORCID: 0000-0001-9399-8380

Received by editor(s): January 11, 2012
Received by editor(s) in revised form: April 19, 2012
Published electronically: April 18, 2013
Additional Notes: The first author was partially supported by NSF grant DMS-0900865.
Article copyright: © Copyright 2013 American Mathematical Society
The copyright for this article reverts to public domain 28 years after publication.