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In this paper, we discuss the properties of one dimensional quantum Zakharov system which describes the nonlinear interaction between the quantum Langmuir and quantum ion-acoustic waves. The system with initial data $(E(0),n(0),\partial_t…

Analysis of PDEs · Mathematics 2017-05-09 Jin-Cheng Jiang , Chi-Kun Lin , Shuanglin Shao

Generalizing the framework of an ultra-weak formulation for a hypersingular integral equation on closed polygons in [N. Heuer, F. Pinochet, arXiv 1309.1697 (to appear in SIAM J. Numer. Anal.)], we study the case of a hypersingular integral…

Numerical Analysis · Mathematics 2014-08-25 Norbert Heuer , Michael Karkulik

We study a class of parabolic quasilinear systems, in which the diffusion matrix is not uniformly elliptic, but satisfies a Petrovskii condition of positivity of the real part of the eigenvalues. Local well-posedness is known since the work…

Analysis of PDEs · Mathematics 2026-01-30 Isabelle Gallagher , Ayman Moussa

We prove local in time well-posedness for the Zakharov system in two space dimensions with large initial data in L^2 x H^{-1/2} x H^{-3/2}. This is the space of optimal regularity in the sense that the data-to-solution map fails to be…

Analysis of PDEs · Mathematics 2009-04-06 Ioan Bejenaru , Sebastian Herr , Justin Holmer , Daniel Tataru

We study quantitative stability results for different classes of Sobolev inequalities on general compact Riemannian manifolds. We prove that, up to constants depending on the manifold, a function that nearly saturates a critical Sobolev…

Analysis of PDEs · Mathematics 2024-05-28 Francesco Nobili , Davide Parise

We consider the Cauchy problem for the Gross-Pitaevskii infinite linear hierarchy of equations on $\mathbb{R}^n.$ By introducing a (F)-norm in certain Sobolev type spaces of sequences of marginal density matrices, we establish local…

Mathematical Physics · Physics 2014-03-12 Zeqian Chen

In this paper we prove local well-posedness for Quasi-linear Scrh\"odinger equations with initial data in unweighted Sobolev Spaces. For small initial data with minimal smoothness this has addressed by J. Marzuola, J. Metcalfe and D.…

Analysis of PDEs · Mathematics 2014-10-02 Nicholas P. Michalowski

In this paper we are interested in the global well-posedness of the 3D Klein-Gordon-Zakharov equations with small initial data. We show the uniform boundedness of the energy for the global solution without any compactness assumptions on the…

Analysis of PDEs · Mathematics 2023-04-11 Xinyu Cheng , Jiao Xu

This work is devoted to the stochastic Zakharov system in dimension four, which is the energy-critical dimension. First, we prove local well-posedness in the energy space $H^1\times L^2$ up to the maximal existence time and a blow-up…

Analysis of PDEs · Mathematics 2024-10-08 Sebastian Herr , Michael Röckner , Martin Spitz , Deng Zhang

We consider the mass-supercritical, defocusing, nonlinear Schr{\"o}dinger equation. We prove loss of regularity in arbitrarily short times for regularized initial data belonging to a dense set of any fixed Sobolev space for which the…

Analysis of PDEs · Mathematics 2025-07-23 Rémi Carles , Louise Gassot

This paper studies a class of linear parabolic equations with measurable coefficients in divergence form whose volumetric heat capacity coefficients are assumed to be in some Muckenhoupt class of weights. As such, the coefficients can be…

Analysis of PDEs · Mathematics 2025-11-11 Junyuan Fang , Tuoc Phan

In this note we report local well-posedness results for the Cauchy problems associated to generalized KdV type equations with dissipative perturbation for given data in the low regularity $L^2$-based Sobolev spaces. The method of proof is…

Analysis of PDEs · Mathematics 2017-05-02 Xavier Carvajal , Mahendra Panthee

We study a conormal boundary value problem for a class of quasilinear elliptic equations in bounded domain $\Omega$ whose coefficients can be degenerate or singular of the type $\text{dist}(x, \partial \Omega)^\alpha$, where $\partial…

Analysis of PDEs · Mathematics 2023-05-15 Hongjie Dong , Tuoc Phan , Yannick Sire

The work by Kenig-Ponce-Vega [15] initiated the use of Bourgain spaces to study the low-regularity well-posedness of semilinear dispersive equations. Since then, the Bourgain space method has become the dominant, and almost the only method…

Analysis of PDEs · Mathematics 2025-09-15 Xinfeng Hu , Li Tu , Yi Zhou

The quantum Zakharov system in three-spatial dimensions and an associated Lagrangian description, as well as its basic conservation laws are derived. In the adiabatic and semiclassical case, the quantum Zakharov system reduces to a quantum…

Plasma Physics · Physics 2015-05-13 Fernando Haas , Padma Kant Shukla

The Cauchy problem for the Zakharov system in the energy-critical dimension $d=4$ is considered. We prove that global well-posedness holds in the full (non-radial) energy space for any initial data with energy and wave mass below the ground…

Analysis of PDEs · Mathematics 2023-10-10 Timothy Candy , Sebastian Herr , Kenji Nakanishi

In this work, we revisit the study by M. E. Schonbek [11] concerning the problem of existence of global entropic weak solutions for the classical Boussinesq system, as well as the study of the regularity of these solutions by C. J. Amick…

Analysis of PDEs · Mathematics 2020-02-03 Luc Molinet , Raafat Talhouk , Ibtissam Zaiter

The Cauchy problem for the Zakharov-Kuznetsov equation is shown to be locally well-posed in H^s(R^2) for all s>1/2 by using the Fourier restriction norm method and bilinear refinements of Strichartz type inequalities.

Analysis of PDEs · Mathematics 2013-10-23 Axel Grünrock , Sebastian Herr

We develop an optimal regularity theory for parabolic partial differential equations in weighted mixed norm Sobolev-Zygmund spaces. The results extend the classical Schauder estimates to coefficients that are merely measurable in time and…

Analysis of PDEs · Mathematics 2026-01-01 Jae-Hwan Choi , Junhee Ryu

An initial-boundary value problem with homogeneous Dirichlet boundary conditions for three-dimensional Zakharov-Kuznetsov equation is considered. Results on global existence, uniqueness and large-time decay of weak solutions in certain…

Analysis of PDEs · Mathematics 2015-06-26 Andrei V. Faminskii