Alcubierre warp drive as time machine.

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The Alcubierre warp drive, if it existed, could theoretically function as a time machine by allowing faster-than-light travel, which raises concerns about causality violations. The discussion highlights that while the concept of FTL travel opens the door to time travel experiments, it also suggests that the universe may impose conditions that prevent such violations. The potential for time travel through an Alcubierre drive remains speculative and hinges on the laws of physics. Overall, the feasibility of using this drive for time travel is tied to understanding the implications of FTL travel. The conversation emphasizes the need for further exploration of these theoretical frameworks.
sshai45
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Hi.

I heard it's possible to use an "Alcubierre warp drive" as a time machine, if they existed. But how, precisely, would that work?
 
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It would normally be called a "causality violation".
In general, traveling faster than light suggests the possibility of setting one up.
Read through: http://www.physicsguy.com/ftl/html/FTL_intro.html
Alcubierre drives would certainly offer the opportunity to experiment in time travel ... though I would anticipate that, should the Universe allow FTL under some special conditions, those same conditions would prevent such a violation somehow.
 

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In an inertial frame of reference (IFR), there are two fixed points, A and B, which share an entangled state $$ \frac{1}{\sqrt{2}}(|0>_A|1>_B+|1>_A|0>_B) $$ At point A, a measurement is made. The state then collapses to $$ |a>_A|b>_B, \{a,b\}=\{0,1\} $$ We assume that A has the state ##|a>_A## and B has ##|b>_B## simultaneously, i.e., when their synchronized clocks both read time T However, in other inertial frames, due to the relativity of simultaneity, the moment when B has ##|b>_B##...
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