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Published online by Cambridge University Press: 24 April 2025
After a general description of event horizons, and the definition of the surface gravity of a horizon, we find some formulae valid at horizons. Finally, we calculate the Raychaudhuri equation for the convergence of a black hole, defining the fact that gravity is always convergent. We apply it to horizons, defined by null geodesics, where the equation is slightly modified.
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