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Time Travel Theories.

FishBlast

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Do you think time travel will ever be possible? Stephen Hawking has made some experiments related to this and his conclusion was that because nobody received his invitation to that party he said he'd throw for people of the future, time traveling was never invented. He also said that the feedback effect would cause a massive explosion which would not allow a portal to a different time to be made. But maybe they never got the invitation because something happened to the invitation in the first place - such as the house it was stored in was burnt down or who knows where the invitation got lost in the future (if the future exists at this time, but I doubt it exists).

But everyone's taking the time travel as traveling to an alternative dimension, instead of thinking of using the current existence and modifying it. In the usual theories, if you go back in time you can meet yourself (and maybe both of you explode if you do), or you can cause the grandfather paradox which should erase you from history and such.

What if time is actually not working that way? What if, in order to travel to the past, we must modify the matter? After all, that is what we actually want if we want to change stuff in the past: recreate the events and memories of that time. What if the future and the past do not technically EXIST, only the present exists and the future that will become our present is constantly changing at the same time with the present? What if it's all just a domino game?

In such a theory, one will NOT meet their self in the past if they revert the world to the state during which the time traveler was already born. It would actually mean that the time traveler as a kid would suddenly disappear (and not even be remembered by the parents, it was never born in the first place). This would prevent paradoxes from happening. The rule would be that anything that exists today can be reverted to an earlier form, but if that something is not subjected to reversal, it would not be part of the "new past" that would be created upon the "time travel".
In addition, current existence would have to be erased for the entire world except for the time traveler, in order to bring back the past.

What would happen in this case if the traveler would shoot their own grandfather? Nothing. The traveler will still exist, he/she still keeping the material that they carry since that material was never restored to its past state while the time machine was used. If their grandfather would not be killed, at some point someone ELSE would replace the time traveler as the child of his parents, or there may be no child born at all. More consequences would mean missing animals from that time (material from the food consumed by the parents was never restored to the source) and a different future, a future where the time traveler is known to just have appeared out of nowhere and was never born.

One huge problem related to this time traveling method: it would take a TON of energy to even reverse a small portion of Earth, or a room at least, back into its older state at a recorded time, and it would take an epic super computer to monitor / record changes to the area that will be reverted to its past state (reverse from point B to point A). But it's kind of like a system restore, applied to the real world.

Mind blown? Or the theory might never work? How do you imagine time traveling and why?
 
I think A problem with time travel is where too? If you could travel back in time, even a short distance, say yesterday lunchtime, where would you be? Yesterday lunchtime, the planet was in a different place, the sun was also, the galaxy was too...
 
I think A problem with time travel is where too? If you could travel back in time, even a short distance, say yesterday lunchtime, where would you be? Yesterday lunchtime, the planet was in a different place, the sun was also, the galaxy was too...
Yeah, that might affect certain stuff, but if your goal is to affect let's say... the memories of people that were witnesses of an event, that would work even if you'd "send back in time" a city. (only if no one filmed the event or has sent news out of that city of course, else there would be a lot of researching done at the scene, although the people of that city would deny it happened and a whole lot of chaos would ensue. Lovely, huh?)

As an example: You broke a public statue in front of a crowd and are wanted by the police. You'd use a time machine to make it look as if it never happened, everyone forgets it ever happened and the statue is back together, as if it was never broken.
 
If I could time travel back to just yesterday I'd bet millions on Sweden wooping France's but. :)
 
Traveling backwards in time is impossible, but traveling forwards isn't. Time stops at the speed of light, so if you travled at the speed of light for 1 year and stop, it might be 100 years in the future.
 
Traveling backwards in time is impossible, but traveling forwards isn't. Time stops at the speed of light, so if you travled at the speed of light for 1 year and stop, it might be 100 years in the future.
I'm not talking about traveling by the use of the standard method proposed by the scientists (time travel by light speed).
I am talking about rewinding everything. Controlling a portion of the world into looking like it looked at a save-point. Energy - there is enough of it. A computer to keep track of every little detail of matter - I think there is but cannot be used for anything too large. A machine to use energy to manipulate an area - we do not have it yet.

Also, if time stops when you are at the speed of light, shouldn't YOU be the one aging and the world basically stagnating since you are the one upping your frequency?
And what exactly is time? I see time as an invention of humans to keep track over the changes of matter.

If I could time travel back to just yesterday I'd bet millions on Sweden wooping France's but. :)
If you would not have complete control over the universe but only over Earth, then the outcome of that game might be different. As Lateral Line said, the external forces (positions of galaxies, bodies within the galaxy etc) could affect Earth's results even if you restored it to look as if it were in that time when the game was still on.
 
In your example, the people "today" have the memories they have of the statue being detroyed because it happened and the memory was stored yesterday. If you moved back in four dimensions preventing the statue from being destroyed, then the memories they have today, would not be of the statue being destroyed. How could they have, it hasn't happened.
 
In your example, the people "today" have the memories they have of the statue being detroyed because it happened and the memory was stored yesterday. If you moved back in four dimensions preventing the statue from being destroyed, then the memories they have today, would not be of the statue being destroyed. How could they have, it hasn't happened.
The "today" will be destroyed and non-existent anyway It would be unknown what the people of today would even feel in that case when they'd be reversed to their past selves. Maybe they would just never remember it and life would seem as if it ran linearly the whole time (like the statue exists but nobody knows it was destroyed by a time traveler).

Maybe they'd even have scrambled memories of the future left due to errors (some deja vus made me wonder this, as my entire class once had the feeling that we have been through a certain maths lesson already and that we wrote it down, yet none of us could find said lesson in our notebook so we went through it anyway. At the end of the lesson, I looked over what I wrote on the notebook, only to see the same things written and pretty much same mistakes, as if it had happened before. There was lots of discussion on that odd mass deja vu moment between my classmates that day...)

But most likely it would feel like the first case: linear memory. What has been reversed has been forgotten, as if it never existed, and people would never even know that statue was once destroyed.
Ever lost consciousness and never got to record in your memory what happened before you fainted? It would feel like that. (note that I've never been unconscious that way anyway, only time I am unconscious is during sleep but there are cases when I wake up in the morning, talk one thing with someone, go back to bed and forget that the discussion ever took place).
 
I'm a fan of the "ripple theory" of time travel.
Imagine movement through time as like a ripple spreading out on the surface of a pond. We are all moving along with the ripple, creating our perception of time.
If one were to jump forward or backward in time, effectively you'd be moving to a different ripple. There can be as many ripples expanding out as you want, none of which interfere with each other because they all move through time at the same speed. So if you left your time and moved back to the past, you'd still encounter an "earlier" version of yourself - but you would have no memory of this happening previously in your life because in your "ripple", this never happened. With me so far?
It also allows you to kill your own grandfather etc as again, in your "ripple" this didn't happen and so you would not suddenly vanish. However, in that time stream there would be no version of you in the future.

In any version of time travel, however, there is no reason to have any sort of paradox happen on meeting yourself. Your body consists of atoms, which follow set rules of physics on encountering any other atoms. There is no reason to suppose they would magically treat each other differently. This does lead to one of the rarely talked about side effects of time travel - alteration of the mass of the universe. Moving matter backwards in time means the current universe becomes lighter and the past one heavier, unless there is some sort of equivalent displacement (either in the form of other mass or as energy). Jumping forward in time will lead to a temporary lightening of the universe, until the mass in transit reappears.
 
I'm a fan of the "ripple theory" of time travel.
Imagine movement through time as like a ripple spreading out on the surface of a pond. We are all moving along with the ripple, creating our perception of time.
If one were to jump forward or backward in time, effectively you'd be moving to a different ripple. There can be as many ripples expanding out as you want, none of which interfere with each other because they all move through time at the same speed. So if you left your time and moved back to the past, you'd still encounter an "earlier" version of yourself - but you would have no memory of this happening previously in your life because in your "ripple", this never happened. With me so far?
It also allows you to kill your own grandfather etc as again, in your "ripple" this didn't happen and so you would not suddenly vanish. However, in that time stream there would be no version of you in the future.

In any version of time travel, however, there is no reason to have any sort of paradox happen on meeting yourself. Your body consists of atoms, which follow set rules of physics on encountering any other atoms. There is no reason to suppose they would magically treat each other differently. This does lead to one of the rarely talked about side effects of time travel - alteration of the mass of the universe. Moving matter backwards in time means the current universe becomes lighter and the past one heavier, unless there is some sort of equivalent displacement (either in the form of other mass or as energy). Jumping forward in time will lead to a temporary lightening of the universe, until the mass in transit reappears.

That ripple one sounds more like a multiple universe based one. It would be plausible if there are multiple universes and indeed there would be no consequences.

Personally, I don't believe in the existence of parallel universes (but then again they probably cannot be proven or disproved, or at best can be said to not be technically parallel since there is one thing that unites them: when its inhabitants think of the existence of the other universe, it would be a connection between the two parallel universes, even if figuratively if you get what I mean).

But if one were to change this existence, they'd just calculate the matter (atoms and such) and the changes they must do in order to restore what they want back to a previous state (say, a city or a whole country if given the power and tools).
But the problem is getting a machine that could use a huge amount of energy and manipulate something that's on the machine's outside, not on the inside. However, with the inside version, humans could repeatedly degenerate back to their youth (maybe losing their memories as a side-effect, unless it could be accepted to keep memories while being turned younger, but that leads to mental overload syndrome and could practically kill the person).
Which again poses a problem: even making a single creature or object "younger" would require that you:
1) Gather back all material the body has lost throughout the world (easier done when said body lived in an enclosure during the recorded period)
2) Take out all the extra material acquired between point A and point B, in order for the body to be back to state in point A.
 
Time travel never will be invented, if it had been at any point in our future then we would have been visited by time travellers already!
 
Time travel never will be invented, if it had been at any point in our future then we would have been visited by time travellers already!
Unless it doesn't work that way and it has actually to happen. Let's say the rule would be that you can only travel between savepoints. If you didn't have the machine during current time, you can not have a savepoint during this time, thus time traveling is impossible in this time, but may be possible at a later time.

So if the time travel technology hasn't been made before 2012, then it's obvious it won't be able to send people backwards in time to before 2012. But if it would be made after 2012, say in 2500, then the time traveling will only be possible between 2500 and the traveler's next date as a savepoint. (Because the machine might not be able to pull it out of nowhere, it needs a well-defined schematic, or else it might just turn whatever it is changing into a distortion).
 
This is a kind of sideways step. I've not thought much about it.

If you travel back in time, at the arrival point the mass of the universe has increased. From above, there are now 2 of you yesterday, whereas before there was only 1. The mass of the entire universe is now greater than it was by however much you weigh. That has implications I need to think about.
 

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