Dirac Monopoles and Hawking radiation in Kottler spacetime
  The natural extension of Schwarzschild metric to the case of nonzero cosmological constant $\Lambda$ known as the Kottler metric is considered and it is discussed under what circumstances the given metric could describe the Schwarzschild black hole immersed in a medium with nonzero energy density. Under the latter situation such an object might carry topologically inequivalent configurations of various fields. The given possibility is analysed for complex scalar field and it is shown that the mentioned configurations might be tied with natural presence of Dirac monopoles on black hole under consideration. In turn, this could markedly modify the Hawking radiation process. 
A. A. Bytsenko (Departamento de Fisica, Universidade Estadual de   Londrina, Londrina-Parana, Brazil) and Yu. P. Goncharov (...