Bondi辐射时空中Bondi质量的正性
Positivity of the Bondi mass in Bondi's radiating spacetimes
摘要：
我们发现了与邦迪辐射真空时空的{ \it news函数}有关的两个条件。在一种条件下，用Schoen-Yau方法证明了Bondi质量的正性;在另一种条件下，用Witten方法证明了Bondi质量的正性。
英文摘要：
We find two conditions related to the {\it news functions} of the Bondi's radiating vacuum spacetimes. We provide a complete proof of the positivity of the Bondi mass by using Schoen-Yau's method under one condition and by using Witten's method under another condition.
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