Matching the BPS spectra of heterotic–type I–type I′ strings

Matalliotakis, Dimitris; Nilles, Hans-Peter; Theisen, Stefan

doi:10.1016/S0370-2693(97)01576-1

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Matching the BPS spectra of heterotic–type I–type I′ strings

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Nilles, Hans-Peter
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Theisen, Stefan
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Matalliotakis, D., Nilles, H.-P., & Theisen, S. (1998). Matching the BPS spectra of heterotic–type I–type I′ strings. Physics Letters B, 421(1-4), 169-175. doi:10.1016/S0370-2693(97)01576-1.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-5968-B

Abstract

We give a detailed discussion of the matching of the BPS states of heterotic, type I and type I′ theories in d=9 for general backgrounds. This allows us to explicitly identify these (composite) brane states in the type I′ theory that lead to gauge symmetry enhancement at critical points in moduli space. An example is the enhancement of SO(16)×SO(16) to E8×E8.