Heterotic strings in a uniform magnetic field
arXiv:hep-th/9506071 · doi:10.1016/0550-3213(95)00430-Z
Abstract
An exact conformal model representing a constant magnetic field background in heterotic string theory is explicitly solved in terms of free creation/annihilation operators. The spectrum of physical states is examined for different possible embeddings of the magnetic U(1) subgroup. We find that an arbitrarily small magnetic field gives rise to an infinite number of tachyonic excitations corresponding to charged vector states of the massless level and to higher level states with large spins and charges.
25 pages, harvmac (few comments added, misprints corrected)
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