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Partial differential equations (PDEs): Existence and uniqueness, regularity, boundary conditions, linear and non-linear operators, stability, soliton theory, integrable PDEs, conservation laws, qualitative dynamics.

2 votes
0 answers
300 views

Marcinkiewicz-Mihlin-Hormander Fourier multiplier theorem

I'm trying to understand the hypothesis of the Marcinkiewicz-Mihlin-Hörmander multiplier theorem. See for instance Theorem A in this paper of Elias Stein. Theorem A: Assume that $m: (0, \infty)\to \m …
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  • 161
2 votes
1 answer
104 views

WKB expansion for NLS

We consider the equation (NLS) \begin{eqnarray}\label{gnls} i \epsilon\partial_t u^{\epsilon} + \frac{\epsilon^2}{2}\Delta_{\eta}u^{\epsilon} = \epsilon |u^{\epsilon}|^{2}u^{\epsilon}, \quad x \in \m …
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  • 161
1 vote
1 answer
71 views

Scaling invariance for Hartree equation

Consider generalized Hartree Equation $ i \partial_t u + \Delta u + \left( \frac{1}{|x|^{\gamma}} \ast |u|^p \right)|u|^{p-2}u, \quad u(x, 0)=u_0(x)$ where $0<\gamma<d, p\geq 2, u(x,t)\in \mathbb C …
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  • 161