id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_5o6fhji5yrh4xkecywtfw7us3a	John Byron Manchak	On the Existence of "Time Machines" in General Relativity	2009	8	.pdf	application/pdf	2958	338	82	Within the context of general relativity, we consider one definition of a 'time machine' proposed by Earman, Smeenk, and Wüthrich be the set of points p ∈ M such that every causal curve with past endpoint First, in order to count as a time machine, a spacetime (M,gab) must have a chronology violating region V to the causal future of the time machine Finally, in oder to capture the idea that a time machine must "produce" closed timelike curves, Earman, Smeenk, and Wüthrich demand that a spacetime (M,gab) is hole-free if, for any spacelike surface Σ in M there hole-freeness, one can always find extensions of D(S) bereft of closed timelike curves. A spacetime (M,gab) is an ESW time machine if (i) there is a Following Earman, Smeenk, and Wüthrich, we have assumed that spacetime is hole-free and then shown that certain initial conditions "force" the granted that spacetime is free of closed timelike curves.	./cache/work_5o6fhji5yrh4xkecywtfw7us3a.pdf	./txt/work_5o6fhji5yrh4xkecywtfw7us3a.txt