Black-hole evaporation and ultrashort distances.

摘要: The role played by ultrahigh frequencies or ultrashort distances in the usual derivations of Hawking effect is discussed and criticized. question "would a black hole radiate if there were Planck scale cutoff rest frame hole?" posed. Guidance sought from Unruh's fluid-flow analogue black-hole radiation, taking into account atomic nature fluid. Two arguments for radiation are given which assume length cutoff. One involves response static accelerated detectors outside horizon, other conservation expectation value stress tensor. Neither argument conclusive, but they do strongly suggest that, spite reasonable doubt about "safe" derivation avoids our ignorance ultrashort-distance physics can likely be formulated. Remaining open questions discussed.