= Schwarzschild horizon collision energy
{c}
{title2=$E_{\rm com}^2=m^2[4+(h_1-h_2)^2/(4M^2)]$}
For two equal-mass inward <timelike geodesics> of unit specific <Killing energy>, their invariant <center-of-mass energy> has this finite horizon limit. If both are captured from infinity, <Schwarzschild marginally bound capture> gives $E_{\rm com}<m\sqrt{20}$, with $m\sqrt{20}$ a supremum. No such universal bound follows for particles prepared inside the angular-momentum barrier.
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