Abstract
We study the thermal ensemble of a gas of free strings in presence of a magnetic field. We find that the thermodynamical partition function diverges when the magnetic field exceeds some critical value B cr, which depends on the temperature. We argue that there is a first-order phase transition with a large latent heat. At the critical value an infinite number of states—all states in a Regge trajectory—seem to become massless, which may be an indication of recuperation of spontaneously broken symmetries.
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