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Tensionless gravitational string in $D=6$, $N=1$ heterotic string vacua

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

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Citation

Kim, N., Rey, S.-J., Theisen, S., & Yankielowicz, S. (1998). Tensionless gravitational string in $D=6$, $N=1$ heterotic string vacua. In Y. M. Cho (Ed.), Proceedings of the APCTP Winter School Dualities in Gauge and String Theories: Sorak Mountain Resort, Korea, 17 - 28 February 1997 (pp. 382-389). Singapore [u.a.]: World Scientific.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-5A51-6
Abstract
Summary: We study the non-perturbative Coulomb phase of $D=6$, $N=1$ heterotic string vacua with more than one tensor multiplet. We find that, for $n_T>9$, the Coulomb branch is divided by a codimension-one hypersurface, across which the coupling of gravitational curvature-squared term changes sign. We find a new class of BPS soliton strings whose core is supported by a gravitational instanton, i.e. a self-dual gravitational string. For $n_T>9$, tension of the string vanishes at a codimension-one hypersurface. We suggest that the tensionless gravitational string might be related to a novel infrared phase of quantum gravity.