Time Travel

Wikipedia defines time travel as the concept of movement between certain points in time, analogous to movement between different points in space by an object or a person, typically with the use of a hypothetical device known as a time machine. Time travel is a widely recognized concept in philosophy and fiction. The idea of a time machine was popularized by H. G. Wells’ 1895 novel The Time Machine.

Forward time travel, outside the usual sense of the perception of time, is an extensively observed phenomenon and well-understood within the framework of special relativity and general relativity. However, making one body advance or delay more than a few milliseconds compared to another body is not feasible with current technology. As for backward time travel, it is possible to find solutions in general relativity that allow for it, but the solutions require conditions that may not be physically possible. Traveling to an arbitrary point in space time has a very limited support in theoretical physics, and usually is connected only with quantum mechanics or wormholes, also known as Einstein-Rosen bridges

The absence of time travelers from the future is a variation of the Fermi paradox. As the absence of extraterrestrial visitors does not prove they do not exist, so the absence of time travelers fails to prove time travel is physically impossible; it might be that time travel is physically possible but is never developed or is cautiously used. Carl Sagan once suggested the possibility that time travelers could be here but are disguising their existence or are not recognized as time travelers

The Search For Time Travelers Via Social Media

Michigan Technological University posted a summary of a search for time travelers using social media sites like Facebook, Twitter, and Google+. Physics professor Robert Nemiroff and Ph.D. candidate Teresa Wilson from the university published the work after scouring the internet for discerning information, or content that should not have been known at the time it was posted. The researchers were not able to identify any potential time travelers. The strategy behind the study was relatively simple. The two searched for terms that described items or events that had specific names, or events and items of historical importance. The study centered around two main search labels: Comet ISON and Pope Francis.

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