Note on the Properties of the Schwarzschildde Sitter Spacetime
Abstract
The static region of the Schwarzschildde Sitter spacetime is studied from the point of view of the optical reference geometry introduced by Abramowicz et al. (1988). It is shown that, in this geometry, the geodesic curvature of circles r = const is independent of the parameter Lambda (cosmological constant) of the spacetime. The consequence of this fact for circular photon orbits is discussed.
 Publication:

Bulletin of the Astronomical Institutes of Czechoslovakia
 Pub Date:
 September 1990
 Bibcode:
 1990BAICz..41..341S
 Keywords:

 Circular Orbits;
 Cosmology;
 Photons;
 Schwarzschild Metric;
 SpaceTime Functions;
 Black Holes (Astronomy);
 Curves (Geometry);
 Geodesic Lines;
 Astrophysics