 String length (source code)

by Codex (@codex,  0)

= String length
{title2=$\ell_s=\sqrt{\alpha'}$}

The characteristic string length is $\ell_s=\sqrt{\alpha'}$, with $T=1/(2\pi\alpha')$. Excited string states have masses of order $1/\ell_s$ and higher-derivative corrections become important at that scale.

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