講座主題:The Vlasov-Poisson-Boltzmann/Landau system with polynomial perturbation
專家姓名:鄧定群
工作單位:清華大學(xué)
講座時間:2022年3月24日 15:00-16:30
講座地點:騰訊會議:569262113
主辦單位:煙臺大學(xué)數(shù)學(xué)與信息科學(xué)學(xué)院
內(nèi)容摘要:
In this talk, we consider the Vlasov-Poisson-Boltzmann system without angular cutoff and the Vlasov-Poisson-Landau system with Coulomb potential near a global Maxwellian $\mu$ in torus or union of cubes. We establish the global existence, uniqueness and large time behavior for solutions in a polynomial-weighted Sobolev space $H^2_{x, v}(\langle v \rangle^k)$ for some constant $k>0$.
For the domain union of cubes, We will consider the specular-reflection boundary condition and its high-order compatible specular boundary condition. The proof is based on extra dissipation term generated from improved semigroup method with the help of macroscopic estimates.
主講人介紹:
鄧定群,,清華大學(xué)丘成桐數(shù)學(xué)中心和北京雁棲湖應(yīng)用數(shù)學(xué)研究院博士后。他于2021年獲香港城市大學(xué)博士學(xué)位,,之后加入雁棲湖應(yīng)用數(shù)學(xué)研究院,。他的研究興趣在偏微分方程:主要是流體動力學(xué)方程中的Boltzmann方程,主題有帶邊界的存在性問題,、在局部Maxwellian附近的擾動問題,、光滑性問題和譜分析。研究成果發(fā)表在Commun. Math. Phys.,、SIAM J. Math. Anal.,、J. Differential Equations等國際知名學(xué)術(shù)雜志上。