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-   -   [Science] Time travel? Changing events? (http://forums.filefront.com/pub/401678-time-travel-changing-events.html)

Showd0wN June 23rd, 2009 05:17 AM
Re: Time travel? Changing events?
 
Quote:
Why do you have to calculate the movement of 3 bodies like that instead of being able to model a set of differential equations on the force applied by each body varying with distance?
The simplest explanation is the number of "variables" in the outcome is 1 more than the number of independant equations you are able to set up from the initial system. So no matter how you solve it you are always left with a 1 variable which is unknown. (This explanation, I am aware, doesn't explain the "randomness" I was talking about earlier).

Whereas for 2 bodies we have the same number of final variables as initial equations, as such are able to solve exactly.

Quote:
Current contemporary science believes that if one was to alter time one way or another that our string would vibrate into unison with the one we’ve created or merged with, essentially overlapping our counterpart in that existence, eliminating the prospect of meeting yourself in the new timeline and avoiding paradox - other than self realization that we have shifted out of our original existence.
I would love to see where you got that from. Being rather "avidly" interested in contemporary science I have yet to come across anything that even comes close to being as specific as you are being about how time-travel would work.

AlDaja June 23rd, 2009 06:27 AM
Re: Time travel? Changing events?
 
Quote:
Originally Posted by clan.necrosect (Post 4928554)
I would love to see where you got that from. Being rather "avidly" interested in contemporary science I have yet to come across anything that even comes close to being as specific as you are being about how time-travel would work.
Cosmic String Theory, physicist J. Richard Gott is a good place to start. I've read many of his papers on the subject, very interesting stuff.:cool:

Showd0wN June 23rd, 2009 07:27 AM
Re: Time travel? Changing events?
 
Hmmm all I can find is discussions and solutions regarding closed time-like curves (phys rev d 1991), and some development of the chronology projection conjecture for misner spaces. Maybe a link to a paper would help?

AlDaja June 23rd, 2009 08:10 AM
Re: Time travel? Changing events?
 
Old school – have to go the library. Some of his stuff was published in OMNI years ago, but you can also read his book: Time Travel in Einstein’s Universe: The Physical Possibilities of Travel Through Time. If you are that interested, you might just look him up. Last I heard his is still an instructor at Princeton University. There are also other authors who you can research. Dr. Michio Kaku of the City University of New York has some interesting information on the subject, as String theory is his specialty.:nodding:

Mr. Pedantic June 23rd, 2009 01:26 PM
Re: Time travel? Changing events?
 
Quote:
The simplest explanation is the number of "variables" in the outcome is 1 more than the number of independant equations you are able to set up from the initial system. So no matter how you solve it you are always left with a 1 variable which is unknown. (This explanation, I am aware, doesn't explain the "randomness" I was talking about earlier).
Really? I think I'm pretty okay at maths, but seeing as I'm taking a biology-related degree I haven't done any in a while. But could you show me the equations please? I would be interested to see them for two and three body systems.

And if we have one more variable than equations, doesn't that mean that you have an infinite range of possible values rather than just a small uncertainty about the location of the bodies?

Locomotor June 23rd, 2009 02:24 PM
Re: Time travel? Changing events?
 
Time Travel isn't a topic I've ever been terribly interested in, but there are some very interesting perspectives in here.

As Nemmerle said (as Nemmerle always gets right :)), "time" is merely a label that helps our limited imaginations rationalize physical existence. Just like gravity, matter, etc. They are abstract categorizations, albeit practical and useful ones, we use to define our immediate experiences. Much of the time it is these self-imposed cognitive limitations that inhibit our understanding of the universe, and certainly our imaginings of what is merely mind-boggling versus what is physically possible or not.

That is where I leave you! As much as I am interested in all sorts of physics - as physics is the basis of all the physical, natural sciences - getting into the realm of niche theoretical physics is dangerously close to pseudo-sciencing I think. Not to mention I know nothing about most specialized fields of physics anyway. Interesting stuff nonetheless. :cool:

evolved fungus July 11th, 2009 02:56 PM
Re: Time travel? Changing events?
 
No parrallell universes space was proven to be flat.

Time travel in the sence of going back years in time will NEVER HAPPEN.
You will never go back and prevent WW2, EVER.

TodtheWraith July 11th, 2009 03:24 PM
Re: Time travel? Changing events?
 
This thread is hilarious. You're all arguing about different laws of time travel that were explained to you in TV shows. There's nothing concrete to found any theory on. I fail to see how any of this could matter at all anyway. Regardless of how time-travel would work or if it's possible clearly affects us in no perceivable way.

Anlushac11 July 11th, 2009 03:42 PM
Re: Time travel? Changing events?
 
Quote:
Originally Posted by TodtheWraith (Post 4945574)
This thread is hilarious. You're all arguing about different laws of time travel that were explained to you in TV shows. There's nothing concrete to found any theory on. I fail to see how any of this could matter at all anyway. Regardless of how time-travel would work or if it's possible clearly affects us in no perceivable way.
Actually Astrophysicist Neil Degrasse Tyson had some comments on this subject. Humans on this planet could only go back to when the first time machine is built. We cant go back before that because the machine to do so does not exist here.

We would have to connect to a alien time machine built centuries ago to be able to go back to when their machine was built, assuming any Aliens even built time machines.

TodtheWraith July 11th, 2009 04:12 PM
Re: Time travel? Changing events?
 
Neil Degrasse Tyson (& you??) envision a time machine as something that doesn't travel with you through time?? He (& you??) imagine 2 devices stationary in time?? I'm not sure why (especially since the entire idea is founded on nothing) but this idea seems a lot more plausible to me.

But like I said: Doesn't matter, no perceivable way, nothing more than theories, etc.


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