The energy spectrum of particles will help make out black holes

Scientists from Moscow Institute of Physics and Technology (MIPT), the Institute for Theoretical and Experimental Physics, and the National Research University Higher School of Economics have devised a method of distinguishing black holes from compact massive objects that are externally indistinguishable from one another. The method involves studying the energy spectrum of particles moving in the vicinity -- in one case it will be continuous and in the other it will be discrete. The findings have been published in Physical Review D.

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