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String theory and the M theory?

  1. Jan 26, 2015 #1
    In string theory/M theory, there are two types of strings, open and closed strings. What kind of strings are fermions(electrons, quarks) made out of? Closed or open strings?
     
  2. jcsd
  3. Jan 26, 2015 #2

    jedishrfu

    Staff: Mentor

    From the book The Trouble with Physics by Lee Smolin, the ends of open strings can represent charged particles and closed ones can represent the graviton. See page 106.
     
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