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When Michio Kaku talks about science he often likes to refer to string theory and sometimes to his equation which looks like this (not sure if wrote right): $$L = \Phi^\dagger[i\partial_{\tau}-H]\Phi + \Phi^{\dagger} \ast \Phi \ast\Phi .$$ It appears to me like some field theory Lagrangian with an interacting and a free part but I have no idea what it actually describes.

Can all of string theory really be summarised in this equation? Can someone give a brief description?

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    $\begingroup$ Related: quora.com/What-does-Dr-Michio-Kakus-equation-mean $\endgroup$
    – Qmechanic ♦
    Feb 4, 2016 at 23:02
  • $\begingroup$ Isn't that the equation Homer Simpson came up with when he temporarily became a genius in 1998? Just before he correctly predicted the mass of the Higgs Boson. $\endgroup$
    – sammy gerbil
    Jun 13, 2016 at 15:20
  • $\begingroup$ Why don't you ask Dr Kaku? You can contact him on Facebook. $\endgroup$
    – sammy gerbil
    Jun 13, 2016 at 15:31
  • $\begingroup$ I don't recommend taking Michio Kaku seriously, He is clearly out of touch with physics. This equation is just an arbitrary Lagrangian in string field theory confirmed by him (here youtu.be/0NbBjNiw4tk?si=9yGpy5BtQow05o5Y). This Lagrangian cannot be experimentally measured with our current technology even a century from now. Also, this equation only describes the basics, it doesn't even incorporate supersymmetry $\endgroup$
    – Kasiéobì ùdumágà
    Feb 12 at 2:09

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The quadratic term would give the propagation of the free string, and once ΦΦ and Φ+Φ+ are unpacked we can say what kind of string theory this is. Probably a purely bosonic string if Kaku wrote it in the 1970's.

The second term is a standard interaction vertex which splits one string into two or joins two strings into one - a splitting/joining operator.

FOR MORE INFORMATION CLICK BELOW LINK: http://www.studygtu.com/2016/02/what-is-meaning-of-michio-kakus-equation.html

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    $\begingroup$ Unfortunately, the link containing studygtu.com is now dead. $\endgroup$
    – nonbeing
    Aug 21, 2018 at 18:43

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