Stephen Hawking:build a time machine-Do u believe?

servantx

servantx

Quantum Scribe
Source:
"STEPHEN HAWKING: How to build a time machine" By STEPHEN HAWKING, dailymail.co.uk 3 May 2010

Hello. My name is Stephen Hawking. Physicist, cosmologist and something of a dreamer. Although I cannot move and I have to speak through a computer, in my mind I am free. Free to explore the universe and ask the big questions, such as: is time travel possible? Can we open a portal to the past or find a shortcut to the future? Can we ultimately use the laws of nature to become masters of time itself?

Time travel was once considered scientific heresy. I used to avoid talking about it for fear of being labelled a crank. But these days I'm not so cautious. In fact, I'm more like the people who built Stonehenge. I'm obsessed by time. If I had a time machine I'd visit Marilyn Monroe in her prime or drop in on Galileo as he turned his telescope to the heavens. Perhaps I'd even travel to the end of the universe to find out how our whole cosmic story ends.

To see how this might be possible, we need to look at time as physicists do - at the fourth dimension. It's not as hard as it sounds. Every attentive schoolchild knows that all physical objects, even me in my chair, exist in three dimensions. Everything has a width and a height and a length.
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General relativity predicts that the path of light is bent in a gravitational field; light passing a massive body is deflected towards that body.
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Wiki Source: General Relativity on Wikipedia

220px-Light_deflection.png

Deflection of light (sent out from the location shown in blue) near a compact body (shown in gray)
 
A most interesting theory indeed. Not outside the realm of possibility, this would be fantastic if science could explore it. There are so many things both bad and good that could come of this theory if it were proven true.

However, science seems to be far from any ability to grab a wormhole and stretch it out, as Hawking suggests. Maybe we'll see advances in this sometime, but probably not soon.
 
Physics paper: Formation of closed timelike curves in a composite vacuum/dust asymptotically-flat spacetime by Amos Ori, Department of Physics, Technion - Israel Institute of Technology, Haifa, Israel

Formation of closed timelike curves in a composite vacuum/dust asymptotically-flat spacetime by Amos Ori, Department of Physics, Technion - Israel Institute of Technology, Haifa, Israel

We present a new asymptotically-flat time-machine model made solely of vacuum and dust. The
spacetime evolves from a regular spacelike initial hypersurface S and subsequently develops closed
timelike curves. The initial hypersurface S is asymptotically flat and topologically trivial. The
chronology violation occurs in a compact manner; namely the first closed causal curves form at the
boundary of the future domain of dependence of a compact region in S (the core). This central core
is empty, and so is the external asymptotically flat region. The intermediate region surrounding the
core (the envelope) is made of dust with positive energy density. This model trivially satisfies the
weak, dominant, and strong energy conditions. Furthermore it is governed by a well-defined system
of field equations which possesses a well-posed initial-value problem.
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We present a new asymptotically-flat time-machine model made solely of vacuum and dust.
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Yes, it is a beginning. But the model, of course, makes some assumptions - for the sake of the model - that are not true in the real world. From the blurb can you identify the problem(s)?
 
But the model, of course, makes some assumptions - for the sake of the model - that are not true in the real world. From the blurb can you identify the problem(s)?
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problem 1: initial hypersurface S - Where do we get a hypersurface at the beginning?
problem 2: central core is empty - No mass = no gravity
problem 3: surrounding dust with positive energy density

In my "imagination", a real life application of this can only be achieved by making the device in donuts shape and vacuum out the centre region. The dust surrounding might be charged by providing a positive-energy charged ring-shape electro-magnetic field.

However, I still think that instead of using dust, data-embedded electromagnetic radiation would be a better candidate for time travel because photons can travel in the speed of light and it is a force carrier for the electromagnetic force...
 
Mathematics paper: Time Machine at the LHC - I.Ya. Aref’eva and I.V. Volovich, Steklov Mathematical Institute, Gubkin St.8, 119991 Moscow, Russia

Recently, black hole and brane production at CERN’s Large Hadron Collider (LHC) has been widely discussed. We suggest that there is a possibility to test causality at the LHC. We argue that if the scale of quantum gravity is of the order of few TeVs, proton-proton collisions at the LHC could lead to the formation of time machines (spacetime regions with closed timelike curves) which violate causality. One model for the time machine is a traversable wormhole. We argue that the traversable wormhole production cross section at the LHC is of the same order as the cross section for the black hole production. Traversable wormholes assume violation of the null energy condition (NEC) and an exotic matter similar to the dark energy is required. Decay of the wormholes/time machines and signatures of time machine events at the LHC are discussed.

Source: Time Machine at the LHC - by I.Ya. Aref’eva and I.V. Volovich at Steklov Mathematical Institute, Moscow, Russia
 
Oxford University paper 2009: Time Travel and Time Machines - by Chris Smeenk and Christian Wuthrich, Forthcoming in C. Callender (ed.), Oxford Handbook of Time, Oxford University Press.

This paper is an enquiry into the logical, metaphysical, and physical possibility of time travel
understood in the sense of the existence of closed worldlines that can be traced out by physical
objects. We argue that none of the purported paradoxes rule out time travel either on grounds of
logic or metaphysics. More relevantly, modern spacetime theories such as general relativity seem
to permit models that feature closed worldlines. We discuss, in the context of Godel's infamous
argument for the ideality of time based on his eponymous spacetime, what this apparent physical
possibility of time travel means. Furthermore, we review the recent literature on so-called
time machines, i.e., of devices that produce closed worldlines where none would have existed
otherwise. Finally, we investigate what the implications of the quantum behaviour of matter for
the possibility of time travel might be and explicate in what sense time travel might be possible
according to leading contenders for full quantum theories of gravity such as string theory and
loop quantum gravity.

Source:
Time Travel and Time Machines, by Chris Smeenk and Christian Wuthrich, Oxford University Press.
 
Re: Stephen Hawking:build a time machine-Do u beli

There's one "small" quote from the article that you might have included in a thread entitled "Stephen Hawking:build a time machine-Do u believe?" that quotes Hawking from the same article:

Any kind of time travel to the past through wormholes or any other method is probably impossible, otherwise paradoxes would occur. So sadly, it looks like time travel to the past is never going to happen. A disappointment for dinosaur hunters and a relief for historians.

Read more: http://www.dailymail.co.uk/home/moslive/article-1269288/STEPHEN-HAWKING-How-build-time-machine.html#ixzz1U1H4MSij
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Re: Stephen Hawking:build a time machine-Do u beli

I would like to quote also the next paragraph's beginning.

Any kind of time travel to the past through wormholes or any other method is probably impossible, otherwise paradoxes would occur. So sadly, it looks like time travel to the past is never going to happen. A disappointment for dinosaur hunters and a relief for historians.

But the story's not over yet. This doesn't make all time travel impossible. I do believe in time travel. Time travel to the future.
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Paradoxes can overcome by multi-world view quantum theory. You never change the past of your current world.
 
Re: Stephen Hawking:build a time machine-Do u beli

Paradoxes can overcome by multi-world view quantum theory. You never change the past of your current world.
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That I don't quite understand. You use an article written by Hawking to support your position but reject Hawking's statement and conclusions about the subject that is taken from the same article. That is "paradox" defined.

Hawking's "Chronology Protection Conjecture" (a conjecture, not a theory) isn't comething that he picked from thin air. The conjecture clearly states that there are vacuum solutions to General Relativity that allow for, in theory, CTC's. It goes on to state that when quantum effects are taken into account rather than just viewing the situation from the POV of a sterile well prepared idealized laboratory "universe" - a universe that has other stars, other black holes, planets, dust, and a real, physical, massive gadget of some sort that actually attempts to traverse real a wormhole quantum fluctuations "conspire" to pinch off or otherwise block the mouth of the wormhole. In other words, you can imagine such a construct but you never have to deal with the paradoxes because you are prevented from getting from "here to there"...there being some place in the past.
 
Ah, if time and space has changed around such a massive object such as a black-hole and you only enter that spacetime where it will not drag you further into the supposed wormhole in the gravitional mass of the blackhole, then perhaps, it can not be the same definition of what is perceived as -> this (to borrow a computer programming language term) spacetime, but a new different form of spacetime. Sure you can say that it is all the same spacetime, but Customer A is not the same as Customer B although they are in the same database.

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And we must have a sense of humor or so the Class President of the High School Medicare reunion said.
And someone else said, remember the day you fell out of the window. I guess the guy hadn't studied for a test and was foolin' around or something so when he got his test paper back from the teacher - it had F--- on it. (what the heck is an F---? the student may ask?) Well, anyway, he crumbled up the test paper and threw it out the window (yes, there were small windows at that time). Then the teacher said that if the test paper was not handed back in, he/she (I wasn't in the class) would flunk the student for the entire course and just not for that particular test. Well, Steve the Class President being smaller than the other person could try and lean out of the window and try and pick up the crumbled test paper and give it back to the student to hand in. Except he ended up falling out of the window in that class that day.

A sense of humor!

Trance Disco JT! Let the computer play it (and just try and hit the timing correctly.)

http://www.youtube.com/watch?v=UKQc_9JdcvE

The patches (sound patches - there are 1024 of those totally but not all are like these) plays that way (at a certain tempo).

I suppose I could go into the advanced students doing a chemistry experiment in the lab after school hours, only to have it explode and catch the lab on fire back then, but I think the first one is funnier!

:D
 
And once thrown into another spacetime, you can not get back to the same spacetime you left from. (perhaps???? questions though about that)
 
Hawking's entire premise is incorrect and based entirely on out-dated ideas and mathematics. There is no workable unified theory in his 'era'; thereby rendering all of his ideas completely invalid since a unified theory, or, more precisely, a known 'threshold' must previously exist, before further claims can be accurately made. In his era, no such threshold yet exists, rendering all of his theories thoroughly invalid, null. It is quite difficult to try to build theories on false pretenses, and then realize they are incorrect. This is called a 'faulty path' in our books. It leads nowhere, yet, consumes vast energies on the minds of truly talented individuals. These facts will be realized eventually.
Is it really true, for example, that new 'matter' < a false definition in itself, may not occupy the space of a previously existing universe? The answer is false, because new 'matter' is in itself not a valid concept. If it were, however, it would still be quite possible, based on quantum actions (new things popping in and out of existence, thereby occupying 'a new universe). No, fallacies, all of it. Truth; All exists at all is now. Specific manipulation of the structure is key, and there shall be discovered a perfect structure, but I will not elaborate further. Good day.

S. Z. L. L. 1. 8. 8. 5.
 
Hawking's entire premise is incorrect and based entirely on out-dated ideas and mathematics.
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I'm not advocating one way or the other, but you've made a bold and very specific challenge. Give us the proof that you have that Hawking is incorrect.
 
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