Bound on the rate of Bondi mass loss

To ensure that the light (emitted far away from source of gravity) can arrive at null infinity an asymptotically flat spacetime, it is shown rate Bondi mass aspect has to satisfy some conditions. In Einstein gravity theory, we find sufficient condition implies a bound on loss, i.e., $|\stackrel{\ifmmode \dot{}\else \textperiodcentered \fi{}}{m}|\ensuremath{\le}0.3820\text{ }\text{ }{c}^{3}/G$. This provides new perspective Dyson's maximum luminosity. However, in Brans-Dicke depends behavior radiation field scalar. Specifically, photons escape when scalar gravitational not too large and loss fast.