= Schwarzschild marginally bound capture
{c}
{title2=$|h|<4M$}
= Marginally bound Schwarzschild capture
{synonym}
A <timelike geodesic> with unit specific <Killing energy> can plunge from infinity into a <Schwarzschild black hole> only if its specific <angular momentum> satisfies $|h|<4M$. The limiting case $|h|=4M$ asymptotes to the unstable orbit at $r=4M$. A geodesic already inside the angular-momentum barrier can cross the <event horizon> with larger $|h|$, so the origin-at-infinity condition matters.
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