In a toy model with gases of membranes and strings wrapping over a two-dimensional internal torus, we study the stabilization problem for the shape modulus. It is observed that winding modes of partially wrapped strings and momentum modes give rise to stress in the energy-momentum tensor. We show that this stress dynamically stabilizes the shape modulus of the two torus.

• Received 29 April 2005

DOI:https://doi.org/10.1103/PhysRevD.72.066006