Theoretically it sounds interesting. Odds are that it won't work in reality though - it seems as though they've just played with the math of already existing theories and shown that, according to such math, this scenario is possible. Also, last time I checked a true monopole particle was yet to be discovered, so there are inherent flaws in this scenario (a monopole particle may have been discovered by now, it's not my specialty though). I find it hard to believe that adding mass and energy to one of these particles would result in the formation of an ever expanding universe - wouldn't an infinite universe require infinite mass/energy to expand forever?