arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2201.08280gr-qcmath.AP
收藏

自旋1/2场的Minkowski时空的全局稳定性

Global stability of Minkowski spacetime for a spin-1/2 field

Xuantao Chen

AI总结:

本文研究了Einstein-Dirac系统的初值问题,利用广义波坐标和向量场方法,通过解决导数丢失问题并建立适应度规衰减的Dirac方程估计,证明了无质量情况下Minkowski时空的全局稳定性,并推广至有质量情况的适定性。

摘要:

我们研究了Einstein-Dirac系统的初值问题,并利用广义波坐标证明了无质量情况下Minkowski解的稳定性。这需要理解弯曲时空中的Dirac方程,为此我们建立了各种估计。证明基于向量场方法,该方法广泛用于其他Einstein耦合系统的Minkowski稳定性问题的工作中。在特定的tetrad选择下,通过解决潜在的导数丢失问题,我们证明了Dirac场的分量满足一个拟线性波动方程。我们还证明了该方程的半线性非线性行为类似于null form。通过这种方式,我们获得了场沿光锥的精确衰减。能量动量张量的结构导致度规的某些分量比真空情况表现更差,但额外的结构表明这对全局存在性结果没有损害。此外,我们开发了一种适应于度规衰减的Dirac方程本身的估计,因为与二阶方程的估计相比,这在内部提供了更好的估计。这些估计的结合实现了对Dirac场的良好控制,有助于完成证明。我们还将看到这里的论证如何给出有质量情况下系统适定性的证明。

英文摘要:

We study the initial value problem of the Einstein-Dirac system, and show the stability of the Minkowski solution in the massless case with the use of generalized wave coordinates. This requires the understanding of the Dirac equation in curved spacetime, for which we establish various estimates. The proof is based on the vector-field method which is widely used in works on the stability of Minkowski problems for other Einstein-coupled systems. Under a specific choice of the tetrad, we show that components of the Dirac field satisfy a quasilinear wave equation, by resolving a potential loss of derivative problem. We also show that the semilinear nonlinearity of this equation behaves like a null form. In this way, we obtain the sharp decay of the field along the light cone. The structure of the energy-momentum tensor causes worse behavior of some components of the metric than the vaccum case, but an additional structure shows that there is no harm to the global existence result. In addition, we develop an estimate of the Dirac equation itself adpated to the decay of the metric, as this provides better estimates in the interior compared with the estimates from the second order equation. The combination of these estimates leads to a good control of the Dirac field that helps close the proof. We shall also see how our argument here gives a proof of the wellposedness of the system in the massive case.

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。

↑