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Force-Free Foliations
Geoffrey Compère, Samuel E. Gralla, Alexandru Lupsasca
Electromagnetic field configurations with vanishing Lorentz force density are known as force-free and appear in terrestrial, space, and astrophysical plasmas. We explore a general…
Bulk supertranslation memories: a concept reshaping the vacua and black holes of general relativity
Geoffrey Compère
The memory effect is a prediction of general relativity on the same footing as the existence of gravitational waves. The memory effect is understood at future null infinity as a tr…
Mass of Kerr-Newman Black Holes in an external magnetic field
M. Astorino, G. Compère, R. Oliveri +1
The explicit solution for a Kerr-Newman black hole immersed in an external magnetic field, sometimes called the Melvin-Kerr-Newman black hole, has been derived by Ernst and Wild in…
Classical static final state of collapse with supertranslation memory
Geoffrey Compère, Jiang Long
The Kerr metric models the final classical black hole state after gravitational collapse of matter and radiation. Any stationary metric which is close to the Kerr metric has been p…
Vacua of the gravitational field
Geoffrey Compère, Jiang Long
The Poincaré invariant vacuum is not unique in quantum gravity. The BMS supertranslation symmetry originally defined at null infinity is spontaneously broken and results in inequiv…