For locally symmetric moduli spaces satisfying a compactifiability constraint, every infinite-distance limit produces an exponentially light tower of states, with decay rates forming the convex hull of the weights of a representation of the isometry group.
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We study the R -> 0 limit for heterotic strings of either kind (Spin(32)/Z_2 or E_8 x E_8) compactified on a circle, in the presence of an arbitrary Wilson line. Though for generic Wilson line this limit leads to chaotic behaviour, there are two distinguished, countable subsets of Wilson lines, that are dense in the total space of Wilson lines: One subset leads to decompactification limits; a second subset converges onto periodic orbits. Many of the implications carry over to heterotic strings on a circle of small but finite radius. To complete the picture, we discuss global aspects of the moduli-space, compare it with the ``fiducial'' moduli-space for type I strings on a circle, give a derivation of the map between the moduli of the two heterotic string theories on a circle at an arbitrary point in the moduli space, and compute the smallest radius that can be probed.
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The Boundary of Symmetric Moduli Spaces and the Swampland Distance Conjecture
For locally symmetric moduli spaces satisfying a compactifiability constraint, every infinite-distance limit produces an exponentially light tower of states, with decay rates forming the convex hull of the weights of a representation of the isometry group.