Compactified String Theories  Generic Predictions for Particle Physicsby yanniru Tags: compactified, generic, particle, physics, predictions, string, theories 

#1
Nov1412, 11:31 AM

P: 108

A review paper by Bobby Samir Acharya, Gordon Kane and Piyush Kumar
http://arxiv.org/pdf/1204.2795v1.pdf 12 April 2012 This is my first post here in a long time. I learned of this paper from yesterday's Lubos Motl blog. It is the most instructive string theory paper I have ever read. But I have a questions. AKK derive two low energy effective supergravity theories: one for Mtheory and another for Ftheory IIb. Their conclusion is that the Meffective theory contains "a metric, a 3form gauge field (C) and a gravitino" at low energies along with: "a perturbative superpotential for the moduli [that]vanishes exactly. This is a key point which distinguishes M theory on a G2manifold from other compactifications such as Type IIB and heterotic string theories on a CalabiYau manifold. For instance, CalabiYau manifolds generically have complex structure moduli; since these moduli are already complex fields, the corresponding supermultiplets do not have a shift symmetry and, consequently, the superpotential can contain perturbative contributions dependent on these fields." excerpt from AKK paper. My question is if a vanishing perturbative superpotential implies a true vacuum whereas a fielddependent perturbative superpotential implies a false vacuum? The paper is impressive in that it predicts Dark Matter axions distributed logarithmically over a 10^33 to 1 eV mass range and predicts that Dark Matter WIMPs will exist only if gauginos are suppressed. Richard Ruquist 


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