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Decay estimates for solutions of nonlocal semilinear equations

Published online by Cambridge University Press:  11 January 2016

Marco Cappiello
Affiliation:
Dipartimento di Matematica, Università di Torino, 10123 Torino, Italy, marco.cappiello@unito.it
Todor Gramchev
Affiliation:
Dipartimento di Matematica e Informatica, Università di Cagliari, 09124 Cagliari, Italy, todor@unica.it
Luigi Rodino
Affiliation:
Dipartimento di Matematica, Università di Torino, 10123 Torino, Italy, luigi.rodino@unito.it
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Abstract

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We investigate the decay for |x|→∞ of weak Sobolev-type solutions of semilinear nonlocal equations Pu = F(u). We consider the case when P = p(D) is an elliptic Fourier multiplier with polyhomogeneous symbol p(ξ), and we derive algebraic decay estimates in terms of weighted Sobolev norms. Our basic example is the celebrated Benjamin–Ono equation

for internal solitary waves of deep stratified fluids. Their profile presents algebraic decay, in strong contrast with the exponential decay for KdV shallow water waves.

Type
Research Article
Copyright
Copyright © Editorial Board of Nagoya Mathematical Journal 2015

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