The energy of gravitational waves is a fundamental problem in gravity theory. existing descriptions for the waves, such as well-known Isaacson energy-momentum tensor, suffer from several defects. Due to equivalence principle, can only be defined quasilocally, being associated with closed spacelike 2-surface bounding region. We propose new approach derive directly quasilocal energy. Such an natu...

The contribution of falling precipitation to thunderstorm electrification is examined from an energy standpoint by means of radar measurements of precipitation. The gravitational power associated with falling precipitation is compared with estimates of the thunderstorm electrical output as a test of a causal relationship between these two quantities. The relative importance of the gravitational...