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Geometry of 2+1 dimensional black holes
 Klozová, Eliška ; Krtouš, Pavel (advisor) ; Svítek, Otakar (referee)
A boost Killing vector field with its isometry is considered in the 2+1 di- mensional anti-de Sitter spacetime. Then we choose two isometric surfaces and identify points that are on the same Killing orbit. An object locally isometric to the anti-de Sitter spacetime but with different global topology is obtained - the BTZ black hole. To prove that this object is really a black hole, a new adjusted coordinate system is introduced and the object's spacetime structure is explored. It is shown that such spacetime has outer and inner regions separated by the ho- rizon (null surfaces). We also show that parameter of the identification is closely related to the black hole's mass. Finally, we discuss limit transitions to other in- teresting physical objects with which we support setting of the zero energy-mass level. For understanding the geometry better, many three-dimensional pictures of the considered surfaces are included along with conformal diagrams of the BTZ black hole and also its space structure is depicted. 1
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