Heterotic Strings in Two Dimensions and New Stringy Phase Transitions

Details Heterotic Strings in Two Dimensions and New Stringy Phase Transitions Heterotic Strings in Two Dimensions and New Stringy Phase Transitions

2005-05-10

arxiv.org/abs/hep-th/0505081v2

JHEP 0508:035,2005

Physics

High Energy Physics

High Energy Physics - Theory

32 pages; v2: references added, minor changes

Scientific paper

10.1088/1126-6708/2005/08/035

We discuss heterotic string theories in two dimensions with gauge groups Spin(24) and Spin(8) x E_8. After compactification the theories exhibit a rich spectrum of states with both winding and momentum. At special points some of these stringy states become massless, leading to new first order phase transitions. For example, the thermal theories exhibit standard thermodynamics below the phase transition, but novel and peculiar behavior above it. In particular, when the radius of the Euclidean circle is smaller than the phase transition point the torus partition function is not given by the thermal trace over the spacetime Hilbert space. The full moduli space of compactified theories is 13 dimensional, when Wilson lines are included; the Spin(24) and Spin(8) x E_8 theories correspond to distinct decompactification limits.

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