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We consider Unruh effect as an origin for Schwarzschild black hole entropythus implying unitarian evolution of gravity. We simulate the black hole by setof Unruh horizons and estimate total entropy of the system. Dependence on massand spin of the emitted particles is taken into account. The obtained resultsmay be easily extended to any other intrinsic degrees of freedom of theparticles. Unruh effect contribution to Schwarzschild black hole entropy ispresented in exact analytical form.

Unruh effect and entropy of Schwarzschild black hole