The Causal Structure of Two-Dimensional Spacetimes

Details The Causal Structure of Two-Dimensional Spacetimes The Causal Structure of Two-Dimensional Spacetimes

1992-03-18

arxiv.org/abs/hep-th/9203050v1

Class.Quant.Grav.9:1769-1786,1992

Physics

High Energy Physics

High Energy Physics - Theory

27 pgs., 5 figures (unavailable)

Scientific paper

10.1088/0264-9381/9/7/010

We investigate the causal structure of $(1+1)$-dimensional spacetimes. For two sets of field equations we show that at least locally any spacetime is a solution for an appropriate choice of the matter fields. For the theories under consideration we investigate how smoothness of their black hole solutions affects time orientation. We show that if an analog to Hawking's area theorem holds in two spacetime dimensions, it must actually state that the size of a black hole never {\em increases}, contrary to what happens in four dimensions. Finally, we discuss the applicability of the Penrose and Hawking singularity theorems to two spacetime dimensions.

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