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Thread: confusing paragraph

  1. #1 confusing paragraph 
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    Can someone explain this to me in layman's
    terms?

    ///
    Except for gravity, all physical phenomena are observed to comply with
    the "Standard Model" of particle physics. The Standard Model is a
    relativistic quantum field theory which incorporates the nuclear and
    electromagnetic forces as well as all the observed particles. In this
    theory, any pair of operators corresponding to physical observables at
    space-time events separated by a spacelike interval "commute" (i.e.
    their order can be reversed). In principle, this implies that effects
    cannot propagate faster than light in the standard model, and it can
    be regarded as the quantum field theory equivalent of the infinite
    energy argument.
    ///


    At first it looks like they're making an argument similar to the 'two events will appear to occur in reverse order from a certain frame of reference if FTL' but then they link it to the infinite energy argument. What are they really saying?


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  3. #2  
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    The infinite energy argument relates to accelerated particles as they approach light speed where they can never reach it because it would require infinite energy. It seems like they are saying that "information" cannot go faster than light speed, so another cosmic speed limit. Gravity of course travels at light speed too.


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  4. #3  
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    Quote Originally Posted by Cyberia
    The infinite energy argument relates to accelerated particles as they approach light speed where they can never reach it because it would require infinite energy. It seems like they are saying that "information" cannot go faster than light speed, so another cosmic speed limit. Gravity of course travels at light speed too.
    yeah I understand that, its just that I don't understand how the 'commute' and reversed events statements relate to that.
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  5. #4  
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    It is difficult to decide what they mean. Maybe that for all time frames, relative results are gained as to what happened regarding a specific relativistic event?
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