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On blow-up for the Hartree equation

Jiqiang Zheng — 2012

Colloquium Mathematicae

We study the blow-up of solutions to the focusing Hartree equation i u t + Δ u + ( | x | - γ * | u | ² ) u = 0 . We use the strategy derived from the almost finite speed of propagation ideas devised by Bourgain (1999) and virial analysis to deduce that the solution with negative energy (E(u₀) < 0) blows up in either finite or infinite time. We also show a result similar to one of Holmer and Roudenko (2010) for the Schrödinger equations using techniques from scattering theory.

The defocusing energy-critical Klein-Gordon-Hartree equation

Qianyun MiaoJiqiang Zheng — 2015

Colloquium Mathematicae

We study the scattering theory for the defocusing energy-critical Klein-Gordon equation with a cubic convolution u t t - Δ u + u + ( | x | - 4 | u | ² ) u = 0 in spatial dimension d ≥ 5. We utilize the strategy of Ibrahim et al. (2011) derived from concentration compactness ideas to show that the proof of the global well-posedness and scattering can be reduced to disproving the existence of a soliton-like solution. Employing the technique of Pausader (2010), we consider a virial-type identity in the direction orthogonal to the momentum vector...

An improved maximal inequality for 2D fractional order Schrödinger operators

Changxing MiaoJianwei YangJiqiang Zheng — 2015

Studia Mathematica

The local maximal operator for the Schrödinger operators of order α > 1 is shown to be bounded from H s ( ² ) to L² for any s > 3/8. This improves the previous result of Sjölin on the regularity of solutions to fractional order Schrödinger equations. Our method is inspired by Bourgain’s argument in the case of α = 2. The extension from α = 2 to general α > 1 faces three essential obstacles: the lack of Lee’s reduction lemma, the absence of the algebraic structure of the symbol and the inapplicable...

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