Open strings freely convert into closed strings and vice versa. This is analogous to particles interacting via processes described by feynmann diagrams.eNathan said:Is it possible to convert open strings to closed strings in string theory. Perhaps, we can convert out rest mass into gravitons, and appear in other dimensions. Is this a possibility? Or does string theory not predict this behavior?
It would be nice if they would make this distinction in the popular accounts! If I hadn't read more technical (semi-popular would be a better term) works on the subject, I wouldn't have had any idea what you're talking about. There's a semi-popular book by a guy named Gasperini on pre-Big Bang superstring cosmology that specifies the difference between the bosonic string and superstrings.These are bosonic strings; you evidently think that the distinction fermion/boson corresponds to open/closed. I suspect this comes from popular accounts of the boundary/bulk theory of why gravity is weak compared to the other forces.