His work in this area was spurred by a visit to Moscow and discussions with Yakov Borisovich Zel ` dovich and Alexei Starobinsky , whose work showed that according to the uncertainty principle rotating black holes emit particles .
[ 165 ] [ 164 ] His work in this area was spurred by a visit to Moscow and discussions with Yakov Borisovich Zel ` dovich and Alexei Starobinsky , whose work showed that according to the uncertainty principle rotating black holes emit particles .