2012/05/23 by Yuzhao Wang, Wang, Yuzhao · 7 citations
Mathematics · #35Q55 #Advanced Mathematical Physics Problems #Analysis of PDEs (math.AP) #FOS: Mathematics #Mathematical Analysis and Transform Methods #advanced mathematical theories
paper · pdf · doi:10.48550/arxiv.1205.5205
openalex publication_date 2012/05/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We consider the cubic Hyperbolic Schrödinger equation \eqrefeq:nls on torus \T2. We prove that sharp L4 Strichartz estimate, which implies that \eqrefeq:nls is analytic locally well-posed in in Hs(\T2) with s>1/2, meanwhile, the ill-posedness in Hs(\T2) for s<1/2 is also obtained. The main difficulty comes from estimating the number of representations of an integer as a difference of squares.