The Universe is now 4D officially? Really?

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siu77
siu77
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3 Feb 2018 15:29:59 UTC
Topic 213123
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    Due to the abstract of this article: " we place limits on the screening scale for theories with D>4 spacetime dimensions". Seriously?

    DanNeely
    DanNeely
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    I'm 99% sure that

    3 Feb 2018 17:31:17 UTC
    Message 164117
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      I'm 99% sure that " D=3+1 spacetime dimensions" is the normal 3 space and 1 of time.

      Additional non-expanded space/time dimensions are a characteristic of string/membrane theory.

      Shawn Kwang
      Shawn Kwang
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      DanNeely wrote:I'm 99% sure

      3 Feb 2018 19:53:36 UTC
      Message 164121 in response to message 164117
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        DanNeely wrote:

        I'm 99% sure that " D=3+1 spacetime dimensions" is the normal 3 space and 1 of time.

        Additional non-expanded space/time dimensions are a characteristic of string/membrane theory.

        You are correct. Our macroscopic world that we experience is 3 space and 1 time dimension. And can be expressed functionally a 4-dimensional mathematical construct. Theorists like to expand the number of spacetime dimensions to suit their theories. 

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