Trautman-Bondi Mass for Scalar Field and Gravity
arXiv:gr-qc/9910085
Abstract
The energy at null infinity is presented with the help of a simple example of a massless scalar field in Minkowski spacetime. It is also discussed for Einstein gravity. In particular, various aspects of the loss of the energy in the radiating regime are shown.
LaTeX2e, 14 pages, to appear in Rep. on Math. Physics