Solving the decompactification problem in string theory
Abstract
We investigate heterotic ground states in four dimensions in which N = 4 supersymmetry is spontaneously broken to N = 2. The N = 4 supersymmetry is restored at a decompactification limit corresponding to m _{{3}/{2}} → 0 . We calculate the full modulidependent threshold corrections and confirm that they are suppressed in the decompactification limit, as expected from the restoration of N = 4 supersymmetry. This should be contrasted with the behaviour of the standard N = 2 ground states, where the couplings blow up linearly with the volume of the decompactifying manifold. This mechanism provides a solution to the decompactification problem for the gauge coupling constants. We also discuss how the mechanism can be implemented in ground states with lower supersymmetry.
 Publication:

Physics Letters B
 Pub Date:
 February 1996
 DOI:
 10.1016/03702693(96)008805
 arXiv:
 arXiv:hepth/9606087
 Bibcode:
 1996PhLB..385...87K
 Keywords:

 High Energy Physics  Theory
 EPrint:
 14pp, LaTeX some typos corrected