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Thread: Thema Devia Retrocausation Thread

  1. #1
    Rolanbek's Avatar Malevolent Revenent
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    Default Thema Devia Retrocausation Thread

    Recent articles in the science press have highlighted a new developement in Wheeler-Feynman reverse causation or "Retrocaustion".

    planned experiments involving adaptions of a model for and optical quantum signalling device have thrown open the possibility of a proof (or disproof) of quantum retrocausation.

    The Device which involves splitting a beam of light so that 'entangled photon streams" are created. Both streams of photons whould be resolved into either photons or an interference pattern via a movable detector set beyond an Young's style double slit. The signalling side would move the detector so that measurement of either state could occur and a fixed detector on the other stream would be set to constantly monitor one state. The upshot of which is that as the state of one stream is resolve the quantum entanglement should make the other stream resolve in the same manner.

    As the entanglements occur across paired photons the signal (which state is resolved) would arrive at the time that the stream with the longest journey containing that photon arrives. (speed of light transit, so far so not all that interesting) Signals would need to be sent via oscillating changes in wave/particle resolution.

    The interesting bit occurrs when one swaps the movable with the fixed detector. The measurement resolving the stream would be made later than the fixed detector. Due to the instantaneous nature of state changes transmitted across quantum pairs the changing state would occur after the measurement by the first device.

    Potientially the state change enforced now would be enforced on the detected state a few microseconds ago causing the signal to arrive earlier than it was sent by a factor of the distance travelled.

    What do you chaps think?

    Where would we stand if it could be conclusively prove the current events can influence the past?

    The interesting part is not the device, but he potiential proof/disproof of retrocausation.

    R

    By request for those of the CC who would like to post.

    R
    Last edited by Garbarsardar; October 05, 2006 at 04:58 AM.
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  2. #2
    Vanquisher's Avatar Campidoctor
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    Default Re: Themia Devia Retrocausation Thread

    What would this mean? If (on a quantum scale), events could before the meant that made it come about. How could it be applied? In this universe at least.

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    Rolanbek's Avatar Malevolent Revenent
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    Default Re: Themia Devia Retrocausation Thread

    Well In reality the applications of the successful experiment are limited in scope, excepting of course that one could send a signal into the past.

    The manipulation of past effects by present ones means the in our universe univerderve cause would not always precede effect.

    If one had a fibre optical cable with sufficient lack of loss, (currently not available) so as to be able to send a signal for a light-week. it would be able to send a signal one week into the past.

    The question is how do we accomodate nonlinear causality into current models of the universe, and how do we avoid the problems of paradox?

    R
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    Default Re: Themia Devia Retrocausation Thread

    You'd have to be sending the signal into another universe 'in the past' - it couldn't be your own. What's important here is the possibility of RECEIVING messages sent into the past from another universe parallel to OUR future. If we send messages back, then logically messages could be sent back to us.
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    Default Re: Thema Devia Retrocausation Thread

    Care to give any link? I have trouble understanding this, and I have a uni-diploma in this ****.

    Double slit experiments are strange in general, due to particle/wave duality. A photon can entangle with other photons today even if these photons will be sent through in 2045! Or never at all. Pretty awesome, and of course nobody has any idea why.

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    Rolanbek's Avatar Malevolent Revenent
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    Default Re: Thema Devia Retrocausation Thread

    See also refs. given in Symposium whi;ch spawned this one.

    http://www.twcenter.net/forums/showt...t=63767&page=2

    R
    November 06, 2006 02:10 PM If I knew you were going to populate the Curia with cheapshots, you never would have gotten promoted. - Anon

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