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Thread: Causality question

  1. #1 Causality question 
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    I know bits and bobs about causality and I would like to postulate a question. Causality is broken if information reaches an observer faster than light relative to the object observed right?
    Eg, supposedly paradoxes are formed, such as you could stop an action before it happens if you had FTL information about it (so they say)

    well, logically, I don't see it as a problem, just a logical ''combover''

    I'm not sure about the rules on links in this forum, but the idea I present is best illustrated.
    I don't see how causality would create a paradox in this situation, just an observable ''lag'' between events that happen at instantaneous times.

    i.imgur.com/kxjxp.png


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    ***** Participant Write4U's Avatar
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    Perhaps information can break SOL, but quantum and the instantiation of reality happens @ SOL, the fastest possible time reality can become manifest in this universe.


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    Quote Originally Posted by causal contributor View Post
    I know bits and bobs about causality and I would like to postulate a question. Causality is broken if information reaches an observer faster than light relative to the object observed right?
    Eg, supposedly paradoxes are formed, such as you could stop an action before it happens if you had FTL information about it (so they say)

    well, logically, I don't see it as a problem, just a logical ''combover''

    I'm not sure about the rules on links in this forum, but the idea I present is best illustrated.
    I don't see how causality would create a paradox in this situation, just an observable ''lag'' between events that happen at instantaneous times.

    i.imgur.com/kxjxp.png
    The principle of causality states that no effect can preceed its cause. If events A and B have a lightlike or spacelike spacetime relation then in some frames event A happens before event B and in other frames event B happens before event A. So in such cases there is no unique cause/effect relationship. Events have a lightlike spacetime seperation if light can go from one event to the other faster than the time interval t_B - t_A. The spacetime interval is spacelike if even light can't go between the two events in the time t_B - t_A.
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    Quote Originally Posted by Write4U View Post
    Perhaps information can break SOL, but quantum and the instantiation of reality happens @ SOL, the fastest possible time reality can become manifest in this universe.
    Not even information could travel faster than light. This could cause a paradox.
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    ***** Participant Write4U's Avatar
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    Quote Originally Posted by pmb View Post
    Quote Originally Posted by Write4U View Post
    Perhaps information can break SOL, but quantum and the instantiation of reality happens @ SOL, the fastest possible time reality can become manifest in this universe.
    Not even information could travel faster than light. This could cause a paradox.
    Unless it is non-perturbing information.

    I direct attention to the inflationary epoch of the universe which by scientific consensus happened at FTL. But of course there was not yet spacetime to restrict quantum functions.
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    Quote Originally Posted by causal contributor View Post
    I know bits and bobs about causality and I would like to postulate a question. Causality is broken if information reaches an observer faster than light relative to the object observed right?
    Eg, supposedly paradoxes are formed, such as you could stop an action before it happens if you had FTL information about it (so they say)

    well, logically, I don't see it as a problem, just a logical ''combover''

    I'm not sure about the rules on links in this forum, but the idea I present is best illustrated.
    I don't see how causality would create a paradox in this situation, just an observable ''lag'' between events that happen at instantaneous times.

    i.imgur.com/kxjxp.png
    Actually, Causality isn't broken in your example. Locality is broken. Which isn't at all so weird.

    Thing is, causality isn't broken. In fact, when we look at quantum mechanics the causality demand of observations(!) is so strong that 4D locality can be broken. You cannot change the possible outcomes, only their respective likelihoods of occurrence.
    In the information age ignorance is a choice.
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  9. #8  
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    Quote Originally Posted by Write4U View Post
    I direct attention to the inflationary epoch of the universe which by scientific consensus happened at FTL. But of course there was not yet spacetime to restrict quantum functions.
    Inflation does not lead to faster than light travel. In infation nothing is moving in space faster than the speed of light. What is happening is that the space between objects is increasing at a rate such that the distace between two object changes at a rate faser than c. FTL (i.e. Faster Than Light) means that somethingis moving in space at a speed greater than c. This is an important difference.
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    Quote Originally Posted by pmb View Post
    Quote Originally Posted by Write4U View Post
    I direct attention to the inflationary epoch of the universe which by scientific consensus happened at FTL. But of course there was not yet spacetime to restrict quantum functions.
    Inflation does not lead to faster than light travel. In infation nothing is moving in space faster than the speed of light. What is happening is that the space between objects is increasing at a rate such that the distace between two object changes at a rate faser than c. FTL (i.e. Faster Than Light) means that somethingis moving in space at a speed greater than c. This is an important difference.
    Thanks for clarifying that.
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    You're most welcome Sir! It is my sincere pleasure!
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