Why is most of the information about the matter that went into forming the black hole lost ?
Integrating over M from formula_44 ( the initial mass of the black hole ) to zero ( complete evaporation ) , and over t from zero to formula_45 : formula_46 The evaporation time of a black hole is proportional to the cube of its mass : formula_47 The time that the black hole takes to dissipate is:Where formula_44 is the mass of the black hole .