I have recently heard of something called a Tipler cylinder, which allows time travel to the past.

How is it possible for something to create time travel to the past, according to our current understanding of general relativity?

Time is dilated by a factor of

[latex]\frac{d\tau}{dt}=\sqrt{g_{00}}[/latex]

in general relativity, so how is it possible to make the factor negative?

Edited March 29, 201411 yr by Endercreeper01

There is no way to time travel to the past.

I know, but I was wondering if the Tipler cylinder would actually allow time travel to the past. I suspect it to be pseudoscience, but I was just asking on the forums to make sure.

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A Tipler cylinder, also called a Tipler time machine, was a hypothetical object theorized to be a potential mode of time travel—although later results have shown that a Tipler cylinder could only allow time travel if its length were infinite or with the existence of negative energy (see the discussion of Hawking's proof below).