Register to reply

Compactified String Theories - Generic Predictions for Particle Physics

Share this thread:
Nov14-12, 11:31 AM
P: 108
A review paper by Bobby Samir Acharya, Gordon Kane and Piyush Kumar 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 M-theory and another for F-theory IIb.

Their conclusion is that the M-effective theory contains
"a metric, a 3-form 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 G2-manifold from other compactifications such as Type IIB and heterotic string theories on a Calabi-Yau manifold. For instance, Calabi-Yau 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 field-dependent 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
Phys.Org News Partner Physics news on
'Squid skin' metamaterials project yields vivid color display
Team finds elusive quantum transformations near absolute zero
Scientists control surface tension to manipulate liquid metals (w/ Video)

Register to reply

Related Discussions
Theories and predictions General Discussion 1
String Theory predictions Beyond the Standard Model 18
String thoery predictions Beyond the Standard Model 1
Can string theory make predictions for particle physics? Beyond the Standard Model 4
Generic predictions of quantum theories of gravity Beyond the Standard Model 3