On profile decomposition for Airy type equation

Abstract

We study the linear profile decomposition for the Airy type equation, where the associated Strichartz inequality corresponds to the Fourier extension inequality on the odd curve ${\xi }^{\ell }$. We also investigate an inhomogeneous case, modeled by the odd curve ${\xi }^3+{\xi }^5$ case. We note that, as observed by Frank and Sabin [Math. Ann., 2018], there is a two-profile phenomenon in the profile decomposition associated with odd curves.

The article has been reorganized and rewritten. We focus on the profile decomposition part; part of the proofs are simplified; we also discuss an inhomogeneous case. 31 pages. Comments are welcome!