Publication date: Dec 2004
Abstract:
We consider appearance of isotropically radiating sources located at a
sphere at the static radius of the Schwarzschild-de Sitter spacetimes to
static observers in vicinity of the black hole horizon and the
cosmological horizon and to radially moving observers. We expect these
observers to follow geodesics starting from the static radius. It is
shown that the observed flux diverges at both the horizons for both
classes of observers. Nevertheless the frequency shift remains finite at
the horizons for the radially moving observers.
Authors:
Stuchlík, Zdeněk; PlŠKová, Kamila;