On the Quantum Moduli Space of M Theory Compactifications
  We study the moduli space of M-theories compactified on G_2 manifolds which are asymptotic to a cone over quotients of S^3 x S^3. We show that the moduli space is composed of several components, each of which interpolates smoothly among various classical limits corresponding to low energy gauge theories with a given number of massless U(1) factors. Each component smoothly interpolates among supersymmetric gauge theories with different gauge groups. 
Tamar Friedmann (Princeton University)