Time travel

Hmm. I think that cause and effect are defined by the direction of time.

 

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time is a concept arising from change and motion, and therefore from the succession of cause and effect. you can't seriously think that time is a physical reality. time (and space) supposedly bends in gravity, but how's that possible since time is not made of anything? time is mental, that's why it can only be affected by our state of consciousness (ex: happiness, sadness)

'time itself' can't slow down in gravity or affected by acceleration, the instruments we measure time can be affected however.

 

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Time is a concept (invented by man) that describes a rate, can you really travel through a concept?

 

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Not necessarily invented by man, but by mind. I bet the animals have their 'time' concepts as well.

 

In the West we have a barbaric concept of time linked to materialism. It is something outside of us which we can travel 'through'. Common sayings always suggest this, probably the most crass being "Time is money", which reveals our real attitude toward time - as something to be exploited for material gain.

But time is flowing through us as it flows through all living things.

There is not a separate dimension called 'time'. The 'dimensions' of the Western world are imposed upon nature so that it can be more easily exploited.

 

>> The direction of time is defined by the sequence of cause and effect, and since effects cannot generate their causes, the idea of time going into reverse is nonsense.


The majority of physical interactions (particularly at the interaction or quantum scale) are time reversible. You would have come across reversible reacitons in equilibrium or analytical chemistry at high school. This is the reason that physicists define "arrows of time" where (in general) many point interactions combine to produce (usually associated with energy or entropy) a temporal asymmetry. An example is the action of the 2nd law of thermodynamics, thermodynamic engines distinguish unambigously between past and future via entropy (low entropy states occur in the past).

 

Time stops when you hit the speed of light. It is when matter becomes pure energy. Honestly we dont know what light is, we think it is a photon of sorts. it has properties of both matter and energy, waves and particles. Maybe light is the energy or apparent matter of the next dimention accecisble by the speed of light. time does not exist in this dimention.

 

blackholes stretch and turn time too.

 

dude on a equation matter becomes energy when it travels speed of light, but in reality matter never reaches speed of light.

 

Time is a feeling/sensation. But when we think about it, so is matter.

How do you know, have you tested it?

Saying that light is photons wouldn't explain it, you'd still have to explain what photons are and what they're made of, and if they're made of energy, you'll have to explain what energy is and what it's made of.

Light is matter, like everything else. Or you could say that matter is light, like everything else.

 

I disagree.

Firstly you have to define what time you're talking about, and because this a relativistic theory you need to carefully identify which observer classes you mean.

From first principles, the Lorentz transform is asymptotic at c, this doesn't (imo) mean you can apply the limit of time dilation going to infinity, particularly since light-like observers are a different observer class to time-like observers.

Secondly I don't think you can identify zero length space-time intervals for light like observers with proper time (in the same way you do for time-like observers). This is because that identification explicitly relies on the vanishing of space components of the space-time interval in the object's rest frame, and lightlike observers do not have rest frames.

Finally there is no timelike unit vector in lightlike bases. This means you need two basis vectors to go to zero to represent a zero time interval.

No, it doesn't. There is a restriction that in minkowski space only zero rest mass particles travel at c, and zero rest mass particles must travel at c. However this doesn't mean you go from mass to energy when going from sub light to light speed.

The photon is the exchange boson of the quantised e/m field and its radiation, hence the quantum of light.

 

Energy and particles are pretty much the same, energy is any particle in motion, neither cannot exist without the other. I don't believe time stops at the speed of light either as it depends on the observer, however any observer travelling at the same speed will notice a stop in time, I think thats the key to understanding what is meant by "time stops". The only time travel I can think of is travelling at outrageous speeds and coming back to earth, don't know much about worm holes though.

Well defined...quantisized or packets of energy.

 

creating a time paradox would be difficult to avoid and i certainly would not want to see the effects of one

 

Hey Posters

i hope all is good,

perhaps we could invent a flux capacitator

 

How about inventing a Hyperdimensional Resonator???

The machine that induces out of body experiences in most users almost immediately. When out of your body it is possible to travel in time and space with your astral body and witness or experience events in time. This technology is real and has been experienced by hundreads of people worldwide

http://www.futurehorizons.net/time2.htm

In the fall of 1943 a U.S. Navy destroyer was made invisible and teleported from Philadelphia, Pennsylvania, to Norfolk, Virginia, in an incident known as the Philadelphia Experiment. The ship involved in the experiment was supposedly the USS Eldridge.

 

Time travel is impossible. Thinking otherwise shows a complete lack of understanding regarding what "time" is.

And wormholes are science-fiction. They are a concept that physicists play with for fun, and sci-fi authors and popular science magazines highlight for entertainment and profit. There is no such thing as a wormhole.

The idea that you can travel to a past time relies on the thought that the past still exists somewhere to be travelled to. That an infinte number of "nows" are constantly being generated, and you can pick one to go to.

This isn't to ignore the fact that time is relative, is affected by gravity and speed, or any of the neat features of time. But it flows in one direction, period. And the fact that we can quote a physicist who also doesn't understand time won't change this, all it will do is help him sell some books.

 

I like Swivel's posts

 

I've been reading your various posts regarding space-time travel. It's interesting to me for many reasons, mostly due to it's unusual nature. I suggest you all visit http://www.chronos.ws/ for a better grasp of this subject.

My own theories are simple, if time moves forward then it also has a previous point during which it moves through space. In theory all that is really needed is an ability to warp space somehow an the result should land us back in a conceptual time where things progress once again the same way.

The one issue you all must realize, if you travel in time you'll also be moving in space, thus if I did manage to go back 1 year in time on Earth I would no longer be on Earth but in space! Because everything is constantly rotating an motion is relative, even though I move in time I would still occupy the same space I did when I left it.

Wormholes do exist, it's likely they are natural phenomena generated exactly how theories claim.

So you're wondering how can we send mass through space back to a time where it can again move forward? Well... let me think here...

If time is effected by gravity an gravity is altered by mass, then umm something with an absolute mass would in theory have an ability to travel both forward an backward in time?!

Can mass ever be absolute?

Alright, so I'm not a mathmatics genious or therotician, lol

Oh, wait I see now, in order to move through time you'd need to completely cut off yourself from the surrounding space-time, that means creating a singularity in which space-time is not effecting anything. If you can manage that then you should in essence be outside the universes laws an then acceleration, mass, would be meaningless. But how to move backward in time?

What time is, that's what we need!

 

Don't know what else to tell you, friend. Wormholes are mathimatical constructs. They are not real. They've never been viewed, nor have we even felt a whimper of a trace of them. They are made-up, just like the Easter Bunny. When you hear physicists talking about wormholes, they are talking about equations, not reality.

And keep in mind that a physicist is someone that majored in physics. They are not generally any smarter than your typical lawyer, they just studied something different. Most of them could not give you a decent definition of time. For them, time is the small 't' in equations. And when you manipulate it in equations for your entire life, the idea of making it negative doesn't offend your sensabilities.

Time is not an entity of any sort. All it is is a description of the change in a system. That's it. The past does not exist, nor does the future. So you can't go there. Period.

Look at it this way: If you had a universe with three spheres in it, and the spheres are moving around, the movement of the spheres is a property of space. Space allows the spheres to be distinct from one another, it allows them to alter their relative distance from one another.

Now, all time is, is a way to distinguish the various states of the system. The fact that the system is different than the way it 'used' to be needs some sort of vocabulary, so we can talk about these changes. That is all "time" is, the vocabulary for describing the changes in states within that system.

For it to be of real use, you really need to find some way to measure the rate of change of the system. You could use the rate that a crystal vibrates, and compare that rate to the other things going on in the system. You could see how long it takes for the planet you are on to spin around once, and break that up into tiny bits. Etc...

So when you talk about Time, it is usually of this variety, a measure of a standard that we have created for our own use. Seconds, hours, years, and so forth. But that is not what Time is, it is just the units that we have adopted in order to make standardized measurements.

Time is that other, more primitive idea. This universe with the three spheres keeps altering its appearance. It is now one way, but I remember when the three sphere were closer together... what should I call that state of the system which I remember? And I can see that the spheres continue in their trajectories through space. It almost seems that I could predict where they will be in a later state of the system... what should I call that?

Those ideas are just that... ideas. The only thing that exists is the present. There is only ONE state of any system. It makes no sense to say that a system is in two states at the same "time". Impossible. A mockery of what systems are, and what "time" denotes.

Not only that, but if you go about thinking that all past states of a system are still in existence, you get problems of mass-buildup. This is my own concept, to point out to people who believe in time-travel, just how silly the idea is. If all pasts, presents, and futures all exist at the same time, they must be in close contact with each other. They are sharing information, if nothing else. And since time in infintismal, we would be safe in assuming that all of these pasts, presents, and futures are VERY close to one another. Even if the entanglement of these states of the system are very weak, the sheer number of them, and the fact that a separate system must reside in each, would make the density of even the vacuum of space so extreme, that the entire fabric of space would be a single black hole. Think of all those Earth's in such proximity, even through some mystical barrier, or 'nth dimension. This postulated reality is ludicrous. Not only does it not make sense, it is arrived at with an incorrect understanding of what systems are and what time is.

And it pains me that this is all so. You will not meet a bigger sci-fi geek online. I grew up reading every sci-fi book I could get my hands on. Half of my laying-in-bed-before-I-fall-asleep fantasies involve time travel. I want it to be true as well. But it isn't. Never will be. Stephen Hawkins can't make it so, and neither can Swartzchild or Lorentz or Dirac or Einstein.

 

Time is a measure of motion. The universe itself is motion.

So, travelling forward in time makes no sense. Travelling backward may be possible if you somehow could revert all particles of the universe to some prior state. Dont think thats gonna happen anytime soon.

Sorry H.G. Wells fans.