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Time Travel

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by

Drew Boland

on 2 July 2013

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Transcript of Time Travel

Special Relativity
Is it possible to travel through time?
Time Travel
Overview
Theoretical Rules
Black Holes
Wormholes
Cosmic Strings
Time travel is the method of traveling to the past or future by bending space-time
Minkowski Space is the commonly accepted model of space-time
Space-time is 4D - space is 3D and time is 1D
Events separated by time are causal
Space-time can be curved or flat, depending on strength of gravity
Quantum foam (Star Trek)
Information can reliably travel through time (Star Trek)
Time-travelers must be covered in organic material (Terminator)
You can't change other people's histories, only your own (Back to the Future)
A black hole is a huge, densely-packed amount of matter that results in a gravitational field so strong that not even light can escape it
Predicted by general relativity, which showed that when a supernova dies, it leaves behind a small, dense remnant core
If the core's mass is greater than three times the mass of the Sun, the equations showed, the force of gravity overwhelms all other forces and produces a black hole
Tiny tunnels on quantum foam that traverse space-time
Require a strong gravitational field and exotic matter
Only exist for an instant
Scientists think it's possible for a super-advanced species to use exotic matter to use wormholes to their advantage
We cannot detect black holes with telescopes, but can infer their presence and study their effect on nearby matter

Accretion: black hole passes through a cloud of interstellar matter and draws it inward

Black holes can emit powerful gamma ray bursts, devour nearby stars, and spur and slow the growth of stars
Black Holes
General Relativity
Theoretical string-like objects that wrap around the universe
Thinner than an atom and under immense pressure which leads to immense gravitational pull
The gravitational pull allows objects attached to the cosmic strings to travel at great speeds
By pulling two strings together, it may be possible to bend space time and create a closed timelike curve
Published by Albert Einstein
Used to explain flaws in the theories of gravity
Gravity affects measurements of time and space and warps space-time
Closed timelike curve
Types of Timelines
Mutable
Past can be changed
Used in Back to the Future
Immutable
Past cannot be changed
Alternate
Anything you change affects the future of that timeline, but not yourself
Paradoxes
Causality
Grandfather paradox
Inconsistent causal loops
Conclusion
Forward time travel is possible, because traveling near the speed of light causes time to dilate. Traveling through large distances of time requires a machine that accelerates near the speed of light and can withstand strong gravity. We may also one day capture, stabilize, and enlarge wormholes.
Traveling back in time, however, is difficult and has too many paradoxes.
Tolman's paradox
Sending FTL signals into one's past
The exchange of messages will occur iff it does not occur time-wise; causal contradiction
Therefore, tachyons cannot convey signals
Novikov self-consistency principle
A pastward traveler cannot alter history; he is always part of that history
Laws of physics are the same regardless of one's velocity
Objects in the same relativity frame have the same physics
Speed of light is constant regardless of the motion of the observer or light source
Time dilation
Full transcript