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gr-qc2026
Gravitational Wave Energy Emitted in the Head-On Collision of Two Black Holes
Nesibe Derin Sivrioglu, Robert R. Caldwell
What is the spectrum of gravitational radiation produced by the head-on collision of two equal-mass black holes? The emission is dominated by low frequency bremsstrahlung, producin…
gr-qc2025
The Persistence of Nonlinear Gravitational Wave Memory
Robert R. Caldwell
Nonlinear gravitational wave memory is a surprise of theoretical physics. Whereas it is understood that a gravitational wave induces oscillatory squeezing and stretching motion in…
gr-qc1993★ 25 cited
Green's function for gravitational waves in FRW spacetimes
R. R. Caldwell
A method for calculating the retarded Green's function for the gravitational wave equation in Friedmann-Roberson-Walker spacetimes, within the formalism of linearized Einstein grav…