User talk:CaptainTybusen/Time Travel Theories/@comment-1073312-20100919002458

Okay, I'm freaking out here. I was just about to make a similar blog after reading about Time Travel! Perhaps quantum observation collapsed the wavefunction of my reality and shifted me into this one. Is actually possible in quantum mechanics. O_O

Lets get to business. I don't like time travel very much, and although many of you know I am open minded about deep physics and paranormal stuff, time travel pushes the edge with me, as you can see, I haven't really included it in my fiction, nor do I really want to.

Time in general
For a start, we don't know what the heck time is. Some say its the 4th dimension, but that is outdated. Others say it is a direction in space 3 dimensional spacetime (which I am in favour of). It might appear like a 1D line to us in the 3rd dimension, but in the 4th, time is a 2D plane and has new angles of freedom. According to Rob Byranton, time is being created 1 plank length at a time in the 5th dimension, where spacetime become digitalized into bits or "pixels". We simply view time through a tiny plank sized window, however, if that was wider, we could see different timelines, universes and histories. So there are many views of time. Many, believe that time existed before the Big Bang, which I also believe.

Time Travel
While I'm not saying its impossible, time travel is pretty difficult, and its simply to premature to think about it, simply because we don't really know what spacetime physically is.

Time travel to the future
Okay, time travel to the future is actually possible, in fact, its been done already in the form of Time Dilation (only by a microsecond though). The closer one reaches the speed of light, the more time slows down for the observer. The same happens when an observer is near a massive object, which distorts spacetime around it. Time is flowing more slowly at your feet that at your head. This has actually been measured. GPS satellites in space must be calculated, otherwise time dilation would cause them to calculate wrongly.

So, if a ship travels at 99.99% of the speed of light, for the travellers, after a mere 100 years, they could circumnavigate the known universe. However, when they return to Earth, billions and billions of years would have passed, the Earth long since burned to ashes and the sun cold and dead. This happens to protect the light barrier, so one could not add their speed to the ship.

Time Travel to the past
But now things get much harder. Time travel to the past is dangerous, but not entirely impossible.
 * By Wormhole:Time travel via wormholes is feasible. In fact, wormholes occupy every point in spacetime, but only on the quantum level in form of quantum foam.  It might be possible, to "blow up" one of these wormholes, and enlarge it's radius.  If both ends of the wormhole existed in the same place, only seperated by time, then time travel might be possible.  The drawback to wormholes is that they would soon destroy themselves, as radiation falling in would get caught in a loop, the feedback getting hotter and hotter until the wormhole destroys itself.
 * Classic time machine - Will only work to the point it was first switched on.
 * Cosmic strings - Are incredibly heavy and dense objects left over from the Big Bang. They warp spacetime into a wedge shape, meaning that anyone who passes between two cosmic strings would return before they departed.

Interpretations
I myself, favour the Multiverse congecture over the others, simply because it kills paradoxes, preserves free will and keeps the current timeline consistent. It also leads to quantum immortality (but lets leave that for another post, essentially, we never observe our own death).
 * Chronological Protection Conjecture - The universe always prevents the traveller from going back in time, in order to protect itself.
 * Self Consistency Conjecture - The past is fixed, travellers can go back in time, but can only observe events, never interact.
 * Many Worlds - Going back and changing events creates an entirely new universe for you. For example, it is proven that in the quantum world, particles can exist in many states at once.  But on the maco-level, this creates entirely new universes.  For instance, the quantum particle that makes the decision to go left or right in your brain, can do both at oncem meaning two seperate timelines are created, branching away from each other.  In this versaion of reality, everyone exists in their own universe, basically gods of their own destiny.  I take this further, I do not believe in god, no one decides my fate, I decide my fate.  I am god of my own existence, as my own quantum observation creates the reality I see.
 * Radical re-write conjecture - History can be re-written, changed and morphed. This leads to scary paradoxes, which violate causality (causes happen before effects).  However, this could be the most likely:Eventually history will morph itself so much, that time travel never existed, leading to the universe we all see today.

Speeding up the death of the universe
If time travel to the past is possible, then every day, the universe's death will speed up. Civilizations from the future in a dying universe, will get two choices:navigate to a new one, or go back in time alltogether. As they go back in time, to lets say today, they are increasing the mass of the universe, which gets caught up in a time loop. As the loop goes on, end day will draw closer and closer, until it happened yesterday. The result - destruction of existence.

Time travel is dangerous. If you ever see a time machine destroy it.