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11-Dimensional Chirality?

  1. Jan 29, 2006 #1
    I just read a book by Davies and Brown entitled
    "_Superstrings:_A_Theory_of_Everything_?"

    They dismiss 11D theory as having a fatal flaw: -"A distinctive element
    of the weak interaction is that it breaks left-right mirror symmetry.
    This implies that elementary particles must be endowed with a definite
    handedness, or 'chirality'...It turns out that definite chirality only
    exists in spaces with an odd number of dimensions. This means that
    space must have an odd number of dimensions, and hence spacetime must
    have an even number of dimensions, otherwise there would be no
    chirality in the laws of nature. In short, eleven spacetime dimensions
    won't work."-

    Any thoughts?

    [Moderator's note: While it's true that M-theory on smooth spaces gives
    left-right symmetric physics, M-theory compactified on singular spaces
    generically leads to asymmetric, chiral theories. This is why M-theory
    on singular G_2 manifolds offers realistic backgrounds that may match
    reality. Another way how chiral, asymmetric theories can occur from
    M-theory is in the context of M-theory on two-torus which is not a
    9-dimensional symmetric theory but a 10-dimensional asymmetric one. LM]

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  2. jcsd
  3. Jan 29, 2006 #2
    What are some of the better reasons?

    Crosson Wrote:

    > There are better reasons for why 11 dimensional spacetime is rediculous.
    >
    >
    > Sure Einstein overthrew classical space and time single handedly, but
    > he was guided by evidence and physical principles.
    >
    > Remember that scientific theories are not "correct", they only serve to
    > organize our observations (according to organizational principles.)
    > Therefore, its not that the universe has 11 dimensions, its that the
    > best way to explain the universe is using 11 dimensions. And to me, 11
    > dimensions is not a very good way to explain anything (begs more
    > questions than it resolves).



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