Editing Tipler cylinder (section)

{{Short description|Hypothetical object usable as a time machine}}
A '''Tipler cylinder''', also called a '''Tipler time machine''', is a [[hypothetical]] object [[Theory|theorized]] to be a potential mode of [[time travel]]&mdash;although results have shown that a Tipler cylinder could only allow time travel if its length were infinite or with the existence of [[negative energy]].