The Ground State of Stringy Gravity
If the heterotic string theory is the correct “theory of everything,” then the physics of our world at energies much lower than 1019 Gev should be governed, to a good approximation, by an appropriately modified version of N = 1 supergravity in ten dimensions coupled to a supersymmetrie 1 2 E8 x E8 gauge field.1,2 In fact, there is reason to believe that to lowest order in an appropriate string parameter, the low energy effective theory is the Chapline-Manton theory,3 modified so as to arrange for the cancellation of gauge, gravitational and mixed anomalies.1 This modified Chapline-Manton theory will be abbreviated here as MCM theory.
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