On the Impossibility of Time Travel by J. C. N. Smith

Mr Smith,

I think you will find that almost all the literature would say that there is no sense in which the Universe can have a centre of mass. In any of the "Big Bang" models, space & time are created from essentially nothing, so that a Universe (or domain) becomes the ultimate "affine space", ie having no point of origin. So that, if the Universe is "closed", it is only in the sense of being spatially finite on an *unbounded* surface (eg surface of a sphere). It then becomes a matter of being only able to compare local *relative* centres of mass between relative configurations. That's my take on it anyway!

I have thought again about your Machian proof of the necessity of motion, where motion of a particle can only be fully defined relative to every other particle in the Universe and possible connections to the uncertainty principle. Considering this together with Lev's comments regarding the current paradigm of measurement, I can see a sort of connection to the Bohmian Mechanics model which appears to potentially take the mystery out of quantum mechanics, including the "measurement problem". It does this in part by having the particle positions and momentum states being fully dependant on *all other particle positions and motion* populating the wave function.

This Bohmian model of quantum physics could almost be a micro scale basis for large scale configuration model??

Cheers

Roy J

Hi all ,

What a beautiful discussions ,thanks to both of you for these relevances .

I read them with a lot of interest .

Sincerely

Steve

Mr Smith

On Bohmian Mechanics, I would recommend that you visit the website "www.bohmian-mechanics.net/". This is the homepage of a group of collaborators, Durr, Goldstein, Zhangi et al, who are working on what I think is the most promising extension of Bohm's ideas & "hidden variable" theories in general. They have actually received a grant from FQxi to develop their model. Their site contains many references to books & papers covering the historical development, including the first Bohmian ideas from Louis De Broglie (of "matter waves" fame) pre dating Bohms first published paper by 25 years! as well as the latest developments.

As I previously mentioned, their model can potentially be applied to the Universe as a whole in the context of a deterministic, wave functional configuration evolution. One drawback, at least to date, appears to be that a Bohmian model is inherently non-relativistic, eg configurations are described using a common absolute time. Inherited of course from quantum mechanics.

Regarding this and cosmological issues around open/closed & finite/infinite Universes, you might like to have a quick look at discussions on the comments page to Julian Barbour's article "Is The Universe Expanding?". Recent posts have been quite relevant to these issues, with some interesting technical input from Lawrence Crowell, including his pointing out to me that in the Bohmian model of the Hydrogen atom, the electron is considered to be *stationary* due to a constant phase factor! This is quite puzzling & still has me scratching my head & looking for an interpretational loophole!!

Cheers

Roy J

Hi dear Mr J.C.N.Smith and all ,

I was very fascinated by this papper ,you know I am going to tell you an idea about the evolution and the rule of dynozaurus ,the evolution shows us a specific sequences of building and optimization by the fundamenatl complementarity.

All is linked without any doubt since the beginning and for the future towards this harmony between mass systems .

For exemple The dynnosaurus were bigs ,and a big animal can accelerate the decomposition and thus the catayzation of the ecosystems .What I say is very simple all had ,have and will have a specific rule on the evolution time line constant .The past is evidently the past and a causes of our actual system .

A big animal is easier to decompose or catalyze the alimenatry chain and the nature too around them .

All evolves it's evident towards a complexification and a harmonization everywhere in our physical universal sphere in optimization.

All the universal memmory is in all ,this link is fascinating .The future optimizes itself towards a beautiful incredible sphere of interaction between mass systems and their lifes and buildings .I think what the increase of mass by weak interactions is fascinating ,we polarize all time ,all complexificates itself in a optimization of complemenatrity in all systems ,quantum and cosmological .

Congratulations for this essay dear Mr J.C.N. Smith ,?I read it with a lot of interest ,it's pragmatic and rational .I beleive what The past if to analyze ,the present to evolve and learn and optimize systems and the future to continue this complexisfication by probably many exponentiels ,Fascinating our Story ,and the word is weak .I dream so much about the future ,sure we were in the past ,we are in the present and thus we shall be in the future becaus all is linked evidently

Kinds Regards

Steve

I try to imagine the center of our Universal sphere .Logically we turn around but how ,that's the question ,where are we in fact and how to relativate our perception correctly .

Our Univers has a specifi sequence of building ,a specific building where all evolves ,takes place like a code of becoming in fact .But how correlate correctly all that with a balance between the perception and the present physicality .

If we insert the good sequences and oscillations and if the number of quantum and cosmological spheres are found thus we can find new interesting parameters it seems to me .

It's intriguing all that ,where is this universal central sphere where the light begins and where are we really in fact in our galaxy too ,we see our past ,we are perhaps more near ,more close what we think .The Space I think decrease ,the expansion is probably the past ,a contraction and exponentials are possibles in a rational extrapolation in my opinion .

If the sciences international community focus in complemenatrity about these fundamenatls perhaps we shall know interestings datas .We are so youngs at the scale time ,the compemenatrity of scientists can make many things .

At this moment in 2009 ,we could make so many incredible things I think ,It's the same with the communication and informations ,I imagine the inteligences in our Universe ,how they are ,where they are ...what is the future technologies .

I have some questions about the parameters of life ,in time of course and by quantum code in the main centram sphere,spheron .

Do you know if the pression and the temperature change the amino acids sequences ,I ask me how could be these lifes if I admit what the spherical systems are fundamenatls ,like our brains ,our particles,our waves,our glands,the toris ,the spheroids ,the ellipsoids,the circles,the spheres,let's take our fruits too ,our plants ....thus even the intelligence is on this same logic and the brain creation .

The amino acids thus are relevant and more far the four interactions where perhaps some polarizations are specifics ,I am persusade .

Thus the electromagnetism adapts and permits to evolve.

The pression is probably fundamenatl and the specific ecosystem where minerals ,vegetals and animals have been created .

In resume the 20 amino acids are perhaps fundamenatls in the strong int and gravity and different in the electromagnetisùm adaptation where the temperature,the photosynthesis ,the pression,the kinds of min ,an and veg too ...even a diffrent star implies different parameters in the growth of cells ,and dedifferenciation.

The color thus ,the h ,the density ,the luminosity permits to amino acids ,probably 20 everwhere to adapt themselves in correlation with its secific ecosystem .Fascinating ,if I could see these things ,hihihi

Best Regards

Steve

Hello J. C. N. Smith,

Loved your essay!

I also agree that time travel into the past is not possible, as time as measured on wour watches is not the fourth dimension, but rather a phenomena that arises because the fourth dimension is exapinding realtive to the three spatial dimensions, or dx/dt=ic, from which all of rwlativity and quantum nonloality and entanglement arise.

http://fqxi.org/community/forum/topic/432

MOVING DIMENSIONS THEORY: EXALTING EINSTEIN'S ELEMENTARY FOUNDATIONS OF RELATIVITY & SCHRODENGER'S CHARACTERISTIC TRAIT OF QUANTUM MECHANICS

by Dr. Elliot McGucken

http://fqxi.org/community/forum/topic/238

"A physical theory can be satisfactory only if its structures are composed of elementary foundations. The theory of relativity is ultimately as little satisfactory as, for example, classical thermodynamics was before Boltzmann had interpreted the entropy as probability. -Einstein in a letter to Arnold Sommerfield on January 14th, 1908. CPAE, Vol. 5, Doc. 73:" "When two systems, of which we know the states by their respective representatives, enter into temporary physical interaction due to known forces between them, and when after a time of mutual influence the systems separate again, then they can no longer be described in the same way as before, viz. by endowing each of them with a representative of its own. I would not call that one but rather the characteristic trait of quantum mechanics, the one that enforces its entire departure from classical lines of thought. By the interaction the two representatives [the quantum states] have become entangled." -Schrödinger

Moving Dimensions Theory's simple postulate, physical model, and equation account for both "relativity's elementary foundations," which Einstein stated we yet needed, and Schrödinger's "characteristic trait" of quantum mechanics-entanglement.

MDT: The fourth dimension is expanding relative to the three spatial dimensions at the rate of c, or dx4/dt=ic.

MDT, by treating physical reality as *real,* has found the mechanism for time and its arrows that Feynman had been seeking: "Now if the world of nature is made of atoms, and we too are made of atoms and obey physical laws, the most obvious interpretation of this evident distinction between past and future, and this irreversibility of all phenomena, would be that some laws, some of the motion laws of the atoms, are going one way - that the atom laws are not such that they can go either way. There should be somewhere in the works some kind of principle that uxles only make wuxles, and never vice versa, and so the world is turning away from uxley character to wuxley character all the time - and this one-way business of the interactions of things should be the thing that makes the whole phenomena of the world seem to go one way."

Best,

Dr. E (The Real McCoy)

Thanks J. C. N. Smith!

Yes--fqxi is doing a noble thing here, and it is not easy.

They are of course to be overall commended!

But too, I've got to call them as I see them, even if it sometimes sounds harsh. I was far from alone in my words of constructive criticism.

I hope nobody takes it personally, as again, FQXI is providing a most unique and invaluable forum. They are expending both a lot of time and financial resources in furthering their noble pursuit, so thanks to all!

And I think this year will be even better.

Best,

Dr. E :)

Dr. E (The Real McCoy)

Dear J. C. N. Smith,

I think the time paradox is the Recurrence relation problem for Time scale in Inflationary Universe. Thereby we may have to re-model the Universe in that the prior configuration cannot be restored in reversal of time.

With Best wishes,

Jayakar

Mr Joseph/Mr Smith,

Whilst I haven't heard of Mr Joseph's "Recurrence relation problem", it sounds to me like it could only be in the context of a "cyclic Universe", where a reversal of entropy at the beginning of the contraction phase has been proposed as the basis for time reversal. As Mr Smith has stated, apart from that view being rather dubious in it's own right due to *local* systems still increasing in entropy creating "regions" with different "time arrows" etc, a model with evolving configurations as "time" would preclude the paradox of "restoring" or "reverting to" a prior configuration. It is interesting to note that, at least in the literature I have seen, when the cyclic model is represented two dimensionally with say, X axis as time and Y axis as space, the evolution is always a parabolic curve from the origin to some larger value of the X coordinate when Y again takes the value zero! Time continues in the same direction!!

In the evolving configurations model, it may still be possible, if highly improbable, for a "previous" configuration to randomly "appear" again, given certain assumptions about entropy. Given also that this model cannot be "temporally" infinite and may be constrained to be spatially finite (for Machian reasons), the model may need to be represented as an *infinite* configuration/vector space. This is where we get into the murky waters of "model versus reality". But I may be wrong about this possibility. It may be that this possibility *is* realised in the vector sub-space representing thermal equilibrium, where random fluctuations around the maximum entropy phase could even oscillate between "identical" states? Of course in our model, this has nothing to do with "time" reversing, but with the vastly increased statistical probability of highly uniform microstates transforming.

The cyclic model would seem to be reliant on current observations showing the Universe to be "open", ie "flat" (omega = 1) or having slight negative curvature, being wrong. Any other ways time can reverse or "loop" back on itself, would seem to involve certain solutions in GR. Again, a convincing quantum gravity theory may resolve those issues!

Cheers

Roy J

Hello Mr Smith and Mr Johnstone ,all,

It's interesting all that .

I don't think what the Big Crunch will be ,on the other side ,a harmony between mass is more logic ,it's the same with the Big Bang ,it's rather a kind of placing ,arrangement with a multiplication of quantum spheres like a spherical fractal ,a kind of mitose of quantum spheres .Thus it's just a fact to encircle the gauge .

I consider the rotations of quantum spheres like the link with mass ,thus I can imagine the space like quantum spheres without rotations,thus mass.But they are coded and probably activate themselve by thermodynamics ,considerant the decrease of space and the increase of mass .The density,the mass increases due to a kind of activation for these spheres without rot thus mass thus rule and becoming with its specifics quantum architectures and its spheres ,very numerous like our cosmological spheres ,the volumes of mass and the volume of space are linked in the specific dynamic of our Universe .For the space ,the lattices between the entanglement of quantum spheres ,the sphere is the best form to rotate and furthermore the contact is optimized ,the gravitational waves in this logic are relevant too and the superimposings in the two senses ,quant and cosmol.can permit to link all with these fundamenatl I think rotating quantum and cosmological spheres with the evolution in Time and Space of course to insert the increase of mass and the complexification by polarizations,our quantum codes evolve and complexificate with the very weak interactions .The time in this logic is essential like a constant for the strong interactions ,the evolution of diversification and complexification of spheres continue .Sometimes I say me probably the pole of light is one and the quantum stability in time is the second in the ultim gauge ,thus a linear and a non linear ,thus two senses between the entropy ,and our limits ,walls ,planck dimensions .

Of copurse it's a hypothesis .

What do you think ?

Steve

This Entropy behind ,and if that was the light which becomes mass in an evolution in the physicality ,the light creates the mass ,the lifes ....so spiritual and logic in fact .