Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-08-16
Nucl.Phys. B456 (1995) 699-731
Physics
High Energy Physics
High Energy Physics - Theory
Minor corrections. Version to appear in Nucl. Phys. B
Scientific paper
10.1016/0550-3213(95)00540-2
A large class of four-dimensional supersymmetric ground states of closed superstrings with a non-zero mass gap are constructed. For such ground states we turn on chromo-magnetic fields as well as curvature. The exact spectrum as function of the chromo-magnetic fields and curvature is derived. We examine the behavior of the spectrum, and find that there is a maximal value for the magnetic field $H_{\rm max}\sim M_{\rm planck}^2$. At this value all states that couple to the magnetic field become infinitely massive and decouple. We also find tachyonic instabilities for strong background fields of the order ${\cal O}(\mu M_{\rm planck})$ where $\mu$ is the mass gap of the theory. Unlike the field theory case, we find that such ground states become stable again for magnetic fields of the order ${\cal O}(M^2_{\rm planck})$. The implications of these results are discussed.
Kiritsis Elias
Kounnas Costas
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