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arXiv math/0702132math.AP
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一类具非负位势和任意初始能量的耦合非线性Klein-Gordon方程整体解的不存在性

Nonexistence of global solutions of a class of coupled nonlinear Klein-Gordon equations with nonnegative potentials and arbitrary initial energy

Yanjin Wang

摘要:

本文考虑了形式为\begin{eqnarray*} \left\{\begin{array}{l} u_{tt}-Δu+m_1^2 u+K_1(x)u=a_1|v|^{q+1}|u|^{p-1}u v_{tt}-Δv+m_2^2 u+K_2(x)v=a_2|u|^{p+1}|v|^{q-1}v u(0,x)=u_0; u_t(0,x)=u_1(x) v(0,x)=v_0; v_t(0,x)=v_1(x) \end{array} \right. \end{eqnarray*}在$\R\times\R^n$上的耦合Klein-Gordon方程的Cauchy问题整体解的不存在性.首先对$n=2,3$的一些特殊情形,证明了上述方程对应的Lagrange-Euler方程基态的存在性。然后我们建立了一个低初始能量的爆破结果,这导致了上述系统驻波的不稳定性。此外,作为副产品,我们还讨论了全球存在。其次,我们利用离散方法证明了一般情况下具有非正初始能量的系统:$n\geq 1$的爆破结果。最后,当初始能量为任意正值时,证明了当初始数据满足一定条件时,解在有限时间内爆破。

英文摘要:

In the paper we consider the nonexistence of global solutions of the Cauchy problem for coupled Klein-Gordon equations of the form \begin{eqnarray*} \left\{\begin{array}{l} u_{tt}-Δu+m_1^2 u+K_1(x)u=a_1|v|^{q+1}|u|^{p-1}u v_{tt}-Δv+m_2^2 u+K_2(x)v=a_2|u|^{p+1}|v|^{q-1}v u(0,x)=u_0; u_t(0,x)=u_1(x) v(0,x)=v_0; v_t(0,x)=v_1(x) \end{array} \right. \end{eqnarray*} on $\R\times\R^n$. Firstly for some special cases of $n=2,3$, we prove the existence of ground state of the corresponding Lagrange-Euler equations of the above equations. Then we establish a blow up result with low initial energy, which leads to instability of standing waves of the system above. Moreover as a byproduct we also discuss the global existence. Next based on concavity method we prove the blow up result for the system with non-positive initial energy in the general case: $n\geq 1$. Finally when the initial energy is given arbitrarily positive, we show that if the initial datum satisfies some conditions, the corresponding solution blows up in a finite time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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