• [deleted]

Lawrence,

Let's see if we can find a classical physics example. Suppose we pre-select all attempted conquests of ancient Rome. Then we post-select the cases where the attacker reached Rome but his conquest route was 100% blocked by the Roman armies. Then we ask for the middle measurement: which route did the invading army took? So what we have? We got Hannibal and his Alps crossing. He got from state |A> = attack Rome at time t_1 to state |B> inside the Italian peninsula but with all known paths blocked at time t_3 and = 0 and at time t_2 he was crossing the Alps (weak measurement with amplified values.) But is this proof of backward causation, or of future affecting the present? Not at all. The only valid conclusion is that if you want to transition between near orthogonal states, you need to do things out of the ordinary, or think/act outside the box.

Aharonov's basic equation is: A_w = / and the amplification happens when = almost zero because of the very small denominator.

Let's have another example: . = nearly zero. Let A=a qualifier-type problem. Now pre-select all PhD physics graduate students and post select all Nobel Prize winners. Then one would expect unusually brilliant solutions of the qualifier-type problems for Feynman and others in their graduate student years. And indeed, this is what it happens on average for most of the Nobel prize winners early in their career. But can we conclude this is evidence of the future (winning Nobel prize) affecting the past (a brilliant solution for qualifier-type problems)? No. This is no guarantee of success; it is only a pre-requisite. And here lies the fault of the argument of Aharonov, Davis, and Popescu. Amplified weak measurements are only a pre-requisite of the evolution toward a final orthogonal state, and not a guarantee. There is no destiny at work here.

  • [deleted]

Let's try this post again with greater then and smaller than signs replaced by paranthesis...

Lawrence,

Let's see if we can find a classical physics example. Suppose we pre-select all attempted conquests of ancient Rome. Then we post-select the cases where the attacker reached Rome but his conquest route was 100% blocked by the Roman armies. Then we ask for the middle measurement: which route did the invading army took? So what we have? We got Hannibal and his Alps crossing. He got from state |A) = attack Rome at time t_1 to state |B) inside the Italian peninsula but with all known paths blocked at time t_3 and (A|B) = 0 and at time t_2 he was crossing the Alps [weak measurement with amplified values.] But is this proof of backward causation, or of future affecting the present? Not at all. The only valid conclusion is that if you want to transition between near orthogonal states, you need to do things out of the ordinary, or think/act outside the box.

Aharonov's basic equation is: A_w = (Future|A|Past)/(Future|Past) and the amplification happens when (Future|Past) = almost zero because of the very small denominator.

Let's have another example: (Future| = (Nobel Prize|. |Past) = |graduate student). (Nobel Prize|graduate student) = nearly zero. Let A=a qualifier-type problem. Now pre-select all PhD physics graduate students and post select all Nobel Prize winners. Then one would expect unusually brilliant solutions of the qualifier-type problems for Feynman and others in their graduate student years. And indeed, this is what it happens on average for most of the Nobel prize winners early in their career. But can we conclude this is evidence of the future [winning Nobel Prize] affecting the past [a brilliant solution for qualifier-type problems]? No. This is no guarantee of success; it is only a pre-requisite. And here lies the fault of the argument of Aharonov, Davis, and Popescu. Amplified weak measurements are only a pre-requisite of the evolution toward a final orthogonal state, and not a guarantee. There is no destiny at work here.

  • [deleted]

I think there's a bit of conceptual misunderstanding of what one can expect from the back-reaction of future events to present. One is not saying that the present is determined by the future, such that predictions for present states become exact. One is saying that the present is partially ordered, such that assuming least-action, the probability field is restricted to a known or arbitrarily chosen future state. An example of a known future state would be a folded protein (cited in my ICCS 2007 paper linked earlier).

In the Aharonov-Vaidman paper that Florin earlier linked, the authors take a quantum theory approach with a 2-state vector system, and derive classical time symmetry. In my preprint, "on breaking the time barrier" I take a classical approach with a 2-point boundary value, and derive quantum time asymmetry. One should think that these theories are dual, because one would find that the asymmetry my theory predicts for four dimensions is very tiny, and quantum time asymmetry is only apparent in d > 4.

Tom

  • [deleted]

Aren't D and H fields empirical? My memory is dim on this. What I have in mind, at any rate, is a field conjugation that gives us a direct relation between the classical "corkscrew" path of time and the tensor metric. I know -- that's badly stated; the formalism I imagine, however, should very well show us the restricted domain of future events, even though the range is infinite.

Tom

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Hi,

My feeling is that what we take as "the universe" is just our close neighborhood and that the 'cosmic fabric' is as infinite in time as in space.

His nature is being 'energized matter' and no end is available to that (no start, no end).

Accepting this apparently absurd idea seems to be the solution...

Cheers,

    • [deleted]

    Florin,

    I agree there is no "destiny" with weak measurements. With the states (f| |p) for future and past states the ratio (f|O|p)/(f|i) for the past and future states nearly orthogonal can be seen as adjusting either of the two states f or p, to preferentially select p or f, or some class of states "close" to them. A perfect selection appears to be where the denominator is zero, but this is a singular case and it appears that this ratio is not physically applicable. It is in this way that this could be seen as a process of manipulating states at one time to select outcomes at another time by their overlaps or measure with an observable or operator.

    Cheers LC

      • [deleted]

      Dear Wilton,

      Our observable Universe may or may not be infinite. I tend to think it is proportional to a geometrical power of Dirac's Large Number, 10^40 (such as the cosmological constant in 3-D is 10^(-120)~(10^40)^(-3). But if Scale Invariance is true, then our Universe is just a fractal fragment of an infinite Cantor dust. So infinity is the set of self-similar Universes.

      Have Fun!

      • [deleted]

      But dear Ray,

      The universe is finite, the space is infinite, the time is constant in its locality and moment.

      Why do you say that about the infinity.....a set of universes.....that has no sense Ray in a whole point of vue respecting the uniqueness of all thing.

      I think it's better to focus on a fractal of a real volume and mass, here the center of our Universe.

      The infinity must have its fondamentals also, because we must differenciate the physicality and its intyrinsic laws and the unknown and its eternity if I can say.

      Thus when we speak about physics , we accept its laws and equations.

      We can see the truth when the confusions appear .....

      Friendly

      Steve

      • [deleted]

      Good points, Lawrence -- and exactly the reason I favor a strategy of comnplex analysis on the Riemann sphere to reconcile quantum and classical behavior. The expression 1/0 -- because the Riemann sphere has only the one simple pole at infinity -- is defined to be infinity. This is the division by zero that creates a logical mess in the arithmetic domain.

      Using Hawking's analogy of going "north of the North Pole," we find that extending the time trajectory beyond the singularity allows more room for time to be physically real, even in the imaginary domain, without violating quantum unitarity in the real domain.

      Tomk

      • [deleted]

      Dear Amrit,

      You are quite right, the universe is now! Everything just happens in the very instant of the present. Past is gone and future is an just a possibility.

      Meanwhile, life is a trajectory (like a motion), there is a "now", a "before now" and a "after now". So, what happens in the past, do influence both present and future.

      Cheers,

      • [deleted]

      I have been saying precisely this for decades now. For example my three books Destiny Matrix, Space-Time and Beyond, Super Cosmos all in print on Amazon et-al. David Kaiser of MIT Physics is writing a book in which I am prominently featured. See also Herbert Gold's 1993 book "Bohemia" Simon & Shuster where the above ideas are documented. I also have two papers on the Cornell archive on this one with Creon Levit NASA AMES also printed in IOP Proceedings of DICE 2008.

      Jack Sarfatti, Ph.D. (physics UC, 1969)

      http://stardrive.org

        • [deleted]

        Tom,

        This is similar to a projective geometry. I would need to sit down with this and see if there is anything to what I see as a connection with the WDC. AS (f| and |i) are rotated to an orthogonal configuration it is uncertain how this sets one state, say |i) given the other.

        Cheers LC

        • [deleted]

        Dear Jack,

        This does sound a lot like your ideas. Would you like to contribute a more detailed comment or observation to this blog site? Personally, I'm having difficulty imagining the future affecting the past. Do tachyons really travel backwards in time (I realize that the light cone implies this, because tachyons outrace photons) or are they an example of the local present affecting the global present by simultaneously transferring "spooky" action-at-a-distance phenomena?

        Have Fun!

        Ray Munroe, Ph.D. (HEP-PH physics FSU 1996)

        • [deleted]

        I like your ideas Amrit, youn know it,

        but for the past which can affect the future, I do not agree, because all is the result of a polarization of evolution, we were fishs, we were, cells, we were CH4 H2O NH3....WE WERE AND WE SHALL BE ..............I agree thus for the eternity is now .....but we must acept also the physicality and its dynamics.

        Best Regards

        Steve

        • [deleted]

        I've always believed that the effect of a quantum wave function collapsing into a final state only after it has been "observed" provides an elegant "mechanism" for free will to operate without violating any laws of physics. After all, free will is something we are all aware of most directly through our own experiential knowledge. But how can operate in a brain governed by molecular biology? The indeterminacy of quantum states would appear to provide the "veil" behind which free will can nudge a person's brain state and mental processes into a desired direction. And such free willed brain states could never be observed to violate any laws of physics. Deciding to abstain from that extra bit of candy, for example, can truly be an act of free will.

        This new research showing that future decisions can change preceding states would seem to give further support this viewpoint regarding free will.

        If a person decisions about future actions can trickle back to start changing the intermediate states (steps) leading to the future action, we then have (a) the past decision, (2) the resolve to execute that past decision at some future moment(s), and (3) the actual acting out of that future decision working together to arrange the series of quantum states of the brain which flow into that entire series of events and "micro-decisions."

        In regard to both the beginning and end states of our universe, a similar line of reasoning supports the theory that a Creator/Observer deciding to create a universe with a particular end state, or any set of intermediate states, would be able to "weave" the the laws of physics, universal constants, and "happenstance" from both directions, past to future and from the future to past.

        This would be particularly true if the Creator was "outside" of time (in Eternity meaning not forever but not in time at all) where both the "past" and "future" (as seen from the universe's perspective) are equally present, equally accessible to thought and observation.

        This also goes to the heart of a central issue in philosophy. How can rationality arise from the irrational? (That is a subset of the question, "How can something come from nothing?") Science is based on rationality, and the scientific method arose from within a religious world view that elevated rationality to being a reliable means of thinking, planning, and behaving because Christian theology, rather uniquely, claimed that God is rational and His ways are rational, and therefore the operation of the universe is rational.

        Many who are afraid of these implications want to insist that the "rational" is just an fortuitous outcome of an irrational, random, accidental Big Bang that has had persisting effects...including rational beings who want to speculate about this experience.

        So the question remains: Which existed first, the rational or the irrational?

        For proponents of the latter answer, "the irrational", ironically they can only argue and reason about the irrational using the tools of the reason.

        It is the proponents of the former answer, "the rational existed first", who are the true champions of the Enlightenment which holds to the primacy of reason. Reason existed first, even before matter and the universe as we know it, and this Reason is necessary to explain both how anything exists and how all that exists will end. Between these two hows we might also find they whys.

          • [deleted]

          Dave, you touched on many issues. I too believe that free will gets an explanation in QM mostly because the whole is bigger than the parts and there are additional degrees of freedom which allow for genuine choices to be made, in particular in the way a question can be asked in an experiment which "steers" the quantum system. However, the future influencing on the past is against free will. T'Hooft has some ideas along those lines.

          One key point to realize in this time symmetric formulation of QM is that the system is described by 2 state vectors, and the future one does not influence the past one. Instead, the amplification effects are a result of the interplay between the 2 states in the weak measurement case.

          Davies idea of using the time symmetric formulation and the known begin and end state to understand teleology and the increase of complexity is interesting, but I am afraid it will not hold under close mathematical scrutiny. The problem is that the final state of the universe is only an asymptotic state and the time symmetric QM formalism cannot be used to predict anything. Think of the difference between convergence and uniform convergence. The existence of infinities (infinite future in this case) can very easily play nasty tricks.

          About the question: "How can something come from nothing?" the answer is trivial: because it can. QM and relativity are core physics theories, and their interplay generates field theory and particle creation. Absolute nothingness is unstable as predicted by QM because it violates the Heisenberg principle.

          About the question: "Which existed first, the rational or the irrational?" I'll say this is an ill posed problem because it requires the concept of time which biases the answer towards the rational. I believe in a democracy of ontologies where on is not superior to another. For example, a virtual reality in a computer game is a viable ontology. The only valid question is the question of a creator/designer. Some ontologies cannot create themselves, and this does require a creator (in the example above the computer programmer, in other examples, the watchmaker). To prove that (our) God must exist (or not) is to prove that our universe cannot self-create (or not). In the end, you end up in an God-of-the-gaps type argument.

          15 days later
          • [deleted]

          universe has no destiny, universe is a system in a permanent dynamic equilibrium, no beginning no end, eternal,

          we can only discuss about mankind destiny

          if we will not wake up out of our minds into consciousness we will create bed destiny.........

          yours amrit

            • [deleted]

            Dear Amrit,

            We both - and I hope many more - have the same approach about what we call "universe": No start and no end. The nature of the Nature is being exactly what it presents: Energized matter.

            To say the truth, there is no such a thing like a "universe" of things, once it is infinite and so, not mensurable or countable. The most proper word to define is "cosmos" or "cosmic fabric" (my preferred).

            If no start in time exists, no limits in space eighter. So, lets start thinking the Cartesian approach of reality is not applicable to the "universe".

            Cheers,

            Wilton

            • [deleted]

            Is my "now" = to,

            A: the future's past.

            or is my "now" evolved from

            B:the past's future?

            If A, then observing moment from say 1 second to the next second, will reveal the moment being determined, pre-existence, having allready having a destiny, or pre-arranged path.

            If B,then observing any moments, 1 second to the next 1 second will reveal a "stretched" or lapsed time signature?

            From an observational POV my "now" has happened in both directions A B scenario's. The slight difference being time signatures are fixed for one moment, but is varied for another moment?

            The experimentalists must FIRST determine which scenario they have created or not created ? which, by its very nature will have catastrophic consequence.

            P.S cryptic variable intended ;)