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In this article, we develop a linear profile decomposition for the $$L^p \to L^q$$ adjoint Fourier restriction operator associated to the sphere, valid for exponent pairs $p\max\{p,\tfrac{d+2}d p'\}$$, or if $$q=\tfrac{d+2}d p'$$ and the operator norm exceeds a certain constant times the operator norm of the parabolic extension operator.
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null (Ed.)In this article, we study the problem of obtaining Lebesgue space inequalities for the Fourier restriction operator associated to rectangular pieces of the paraboloid and perturbations thereof. We state a conjecture for the dependence of the operator norms in these inequalities on the sidelengths of the rectangles, prove that this conjecture follows from (a slight reformulation of the) restriction conjecture for elliptic hypersurfaces, and prove that, if valid, the conjecture is essentially sharp. Such questions arise naturally in the study of restriction inequalities for degenerate hypersurfaces; we demonstrate this connection by using our positive results to prove new restriction inequalities for a class of hypersurfaces having some additive structure.more » « less
