Abstract
The value of the dimensionality \(\mathcal{D}\) of the physical space-time can be determined by the application of continuous and discrete symmetry principles to both the \(\mathcal{D}\)-dimensional effective action \(S_\mathcal{D}\) and the two-dimensional world-sheet action S 2 of the heterotic superstring theory. In particular, for a background Friedmann space-time generated by stringy matter with the equation of state \(p = - \rho /(\mathcal{D} - 1)\), we show here that the world sheet is only supersymmetric, and only invariant under the time-reversal operator T, if \(\mathcal{D} = 4\). This is the condition that \(S_\mathcal{D}\) is invariant under T, and also for the realization of the non-linear global supersymmetry due to Volkov and Akulov.
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Pollock, M.D. Superstring symmetries and space-time dimensionality. Eur. Phys. J. Plus 129, 139 (2014). https://doi.org/10.1140/epjp/i2014-14139-6
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DOI: https://doi.org/10.1140/epjp/i2014-14139-6