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A big complicating factor in understanding string cosmology is understanding string theories. String theories and M theory appear to be limiting cases of some bigger, more fundamental theory. Until that's sorted out, anything we think we know today is potentially up for grabs.

Most of the mass in our Universe appears to occur in the form of dark matter. One leading candidate for the composition of this dark matter is something called a WIMP, a Weakly Interacting Massive Particle. One strong candidate for the WIMP comes from supersymmetry.

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http://superstringtheory.com/cosmo/cosmo5.html

Thus, string theory suggests that dark matter is a particle.
Source(s):
http://superstringtheory.com/cosmo/cosmo5.html

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