![]() ![]() ![]() In principle, its implications should be thoroughly definitive-they should provide an unambiguous test of whether the theory is right or wrong. Third, unlike more conventional theories such as the standard model, which has 19 free parameters that can be adjusted to ensure agreement with experimental measurements, string theory has no adjustable parameters. ![]() All of these concepts emerge naturally from string theory. In a rare blend of scientific insight and writing as elegant as the theories it explains, Brian Greene, one of the world's leading string theorists, peels away the layers of mystery surrounding string theory to reveal a universe that consists of 11 dimensions where the fabric of space tears and repairs itself, and all matter-from the smallest. These include the concepts of spin, the family structure of matter particles, messenger particles, gauge symmetry, the equivalence principle, symmetry breaking, and supersymmetry, to name a few. Second, studies by physicists over the past century have revealed that there are other key ideas-many of which have been experimentally confirmed-that appear central to our understanding of the universe. “First, gravity and quantum mechanics are part and parcel of how the universe works and therefore any purported unified theory must incorporate both. ![]()
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