Could you have a hypothetical universe with only photons, electrons, and positrons by adjusting the parameters of the Standard Model to eliminate all the "other" stuff?(adsbygoogle = window.adsbygoogle || []).push({});

If so is String Theory flexible enough to model a hypothetical universe with only photons, electrons, positrons, and Einsteins General Relativity?

Are the vibrating String Theory strings that represent a quark more complex in some sense then the String Theory strings that represent an electron?

Thanks for any help!

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# Adjust parameters of Standard Model so only photons, e-, e+ remain?

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