Acta Astronautica.
Elsevier Ltd.
Vol. 139.
2017.
P. 254-257
The Kerr–Newman and Kottler metrics with two horizons are considered. The evolution of their horizons is analyzed in terms of an effective temperature. One of the horizons proves to decay much faster than the other. The results are applied to black hole physics and cosmology. © 2017, Pleiades Publishing, Ltd.