Global existence for an $L^2$ critical nonlinear Dirac equation in one dimension
Global existence for an $L^2$ critical nonlinear Dirac equation in one dimension
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DOI:
10.57262/ade/1355703201
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发表时间:
2011-07
影响因子:
1.4
通讯作者:
Timothy Candy
中科院分区:
文献类型:
--
作者:
Timothy Candy
We prove global existence from $L^2$ initial data for a nonlinear Dirac equation known as the Thirring model. Local existence in $H^s$ for $s>0$, and global existence for $s>1/2$, has recently been proven by Selberg and Tesfahun by using $X^{s, b}$ spaces together with a type of null form estimate. In contrast, motivated by the recent work of Machihara, Nakanishi, and Tsugawa, we first prove local existence in $L^2$ by using null coordinates, where the time of existence depends on the profile of the initial data. To extend this to a global existence result we need to rule out concentration of $L^2$ norm, or charge, at a point. This is done by decomposing the solution into an approximately linear component and a component with improved integrability. We then prove global existence for all $s>0$.