Description ( non - technical )
نویسنده
چکیده
String theory is a physical model that represents elementary particles by vibrating strings with the aim of unifying the four forces of nature (gravitational, electromagnetic, strong nuclear, and weak nuclear). As a closed string (i.e a loop) moves through space, it may split into two (corresponding to fission), which may later recombine into one (corresponding to fusion). The path traced by a closed string in space-time is a (Riemann) surface, which has one hole (i.e. is of genus 1) and two ends in the just mentioned example:
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