79 citations · 310 across the 37 of their papers we have counts for
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gr-qc1993★ 1 cited
How to Estimate Energy Lost to Gravitational Waves (revised)
Adam D. Helfer
The energy--momentum radiated in gravitational waves by an isolated source is given by a formula of Bondi. This formula is highly non--local: the energy--momentum is not given as t…
gr-qc1993★ 1 cited
Twistors and the BMS Group
Adam D. Helfer
We compute the motions of null infinity to which the components of the angular momentum of the gravitational field, as defined by Penrose, are conjugate. We find that the boosts ar…
gr-qc1993★ 4 cited
A Phase Space for Gravitational Radiation
Adam D. Helfer
We give a new definition, based on considerations of well-posedness for a certain asymptotic initial value problem, of the phase space for the radiative degrees of freedom of the g…