In massive self-gravitating black hole disks, magnetic turbulence damps the m=1 instability and gravitational waves when aligned with the spin, but strongly enhances both when the disk is antialigned.
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Civilizations can achieve galaxy-spanning reach within biological lifetimes via time-dilated orbits near black hole photon spheres using classical general relativity, with a Type II civilization enabling 10^4 dilation factors.
Tidal force calculations in Kerr spacetime show survival of plunge along polar axis is possible for supermassive rotating black holes but not stellar-mass ones.
citing papers explorer
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Multimessenger Signatures of Tilted, Self-Gravitating, Black Hole Disks
In massive self-gravitating black hole disks, magnetic turbulence damps the m=1 instability and gravitational waves when aligned with the spin, but strongly enhances both when the disk is antialigned.
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Redshifted civilizations, galactic empires, and the Fermi paradox
Civilizations can achieve galaxy-spanning reach within biological lifetimes via time-dilated orbits near black hole photon spheres using classical general relativity, with a Type II civilization enabling 10^4 dilation factors.
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A Plunge into the Chasm: Surviving Tidal Effects in Kerr Spacetime
Tidal force calculations in Kerr spacetime show survival of plunge along polar axis is possible for supermassive rotating black holes but not stellar-mass ones.