Positivity of the Bondi mass in Bondi's radiating spacetimes
Wen-ling Huang, Shing Tung Yau, Xiao Zhang
Abstract
We find two conditions related to the 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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