Padmanabhan, T.2012-03-012012-03-011986-05-29http://hdl.handle.net/11007/28It was shown by 't Hooft that a black hole event horizon provades a natural cutoff length for sermclassacal wave modes Here at is shown that tbas result as true m any spacetlme with a horizon.enHorizonsBrick wallBlack holeQuantum structureSpin-zero particlesArticle