http://arxiv.org/abs/2008.07801
The Lukash metric is a homogeneous gravitational wave which approximates at late times the behaviour of a generic class of spatially homogenous cosmological models with monotonically decreasing energy density. Following pioneering work of Siklos, we provide a self-contained account of the geometry and global structure of the spacetime. The latter contains a Killing horizon to the future of which the spacetime resembles an anisotropic version of the Milne cosmology and to the past of which it resemble the Rindler wedge. We discuss the Unruh effect whereby, for a suitable vacuum state, a class of uniformly accelerated observers experience a background of thermal radiation.
M. Elbistan, P. Zhang, G. Gibbons, et. al.
Tue, 25 Aug 20
-1146/99
Comments: 29 pges, 3 figures