Hypersurface where Killing vector becomes null; surface gravity κ linked to Hawking T = ℏκ/(2πck_B); first law dM = (κ/8πG)dA + ΩdJ + ΦdQ.
Hypersurface where Killing vector becomes null; surface gravity κ linked to Hawking T = ℏκ/(2πck_B); first law dM = (κ/8πG)dA + ΩdJ + ΦdQ.