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Black holes by blueshifted light
If you can make black holes out of light you can make black holes out of light that is emmited from the moving frame and concentrated into one spot and that would not have enough energy to form a ...
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On a Doppler-shift-induced radiative dissipation of angular momentum for the accretion disk of a black hole
A recent question explored the possibility that the accretion disk of a black hole could wind down and lose its angular momentum through radiative process, and Rob Jeffries' excellent answer there ...