Gepner-like boundary states on $T^4$
Abstract
We present exact expressions for elementary boundary states which describe D-branes preserving 16 or fewer supercharges in type II superstring compactified on certain self-dual 4-tori. While being manifestly superconformal, our boundary states are not a priori required to satisfy the usual free-field gluing conditions along the internal directions of the 4-tori. Our calculations proceed along the lines of Gepner's construction by recasting the $\mathcal{N}=(2,2)$ worldsheet sigma model on the 4-tori in terms of $\mathcal{N}=2$ minimal models. Imposing general permutation gluing conditions on the $\mathcal{N}=(2,2)$ generators is shown to yield various stable and unstable D-branes, where the stable ones include the known 1/2-BPS and 1/4-BPS bound states of D$p$-branes, as well as new non-BPS D-branes, which do not carry RR charges.
- Publication:
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arXiv e-prints
- Pub Date:
- March 2019
- DOI:
- 10.48550/arXiv.1903.00487
- arXiv:
- arXiv:1903.00487
- Bibcode:
- 2019arXiv190300487S
- Keywords:
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- High Energy Physics - Theory
- E-Print:
- 44 pages, 1 figure