Positivity of the Bondi mass in Bondi's radiating spacetimes
Shing-Tung Yau
Harvard University, Cambridge, United StatesWen-ling Huang
Universität Hamburg, GermanyXiao Zhang
The Chinese Academy of Sciences, Beijing, China

Abstract
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.
Cite this article
Shing-Tung Yau, Wen-ling Huang, Xiao Zhang, Positivity of the Bondi mass in Bondi's radiating spacetimes. Atti Accad. Naz. Lincei Cl. Sci. Fis. Mat. Natur. 17 (2006), no. 4, pp. 335–349
DOI 10.4171/RLM/472