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BPS spectrum on AdS₃times S³ times S³ times S¹

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arxiv 1701.03552 v3 pith:CJE2PWPI submitted 2017-01-13 hep-th

BPS spectrum on AdS₃times S³ times S³ times S¹

classification hep-th
keywords timesspectrumsupergravitytheoryonlystatesstringalgebra
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The BPS spectrum of string theory on AdS$_3\times {\rm S}^3 \times {\rm S}^3 \times {\rm S}^1$ is determined using a world-sheet description in terms of WZW models. It is found that the theory only has BPS states with $j^+ = j^-$ where $j^{\pm}$ refer to the spins of the $\mathfrak{su}(2)$ algebras of the large ${\cal N}=4$ superconformal algebra. We then re-examine the BPS spectrum of the corresponding supergravity and find that, in contradistinction to previous claims in the literature, also in supergravity only the states with $j^+=j^-$ are BPS. This resolves a number of long-standing puzzles regarding the BPS spectrum of string theory and supergravity in this background.

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Cited by 4 Pith papers

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    On AdS3×S3×S3×S1, a Wilson-line deformation of the Spin(16)×Spin(16)⋊Z2 heterotic string produces a level-matched tachyon, so the classical moduli space contains unstable regions.

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  4. Lecture notes on strings in AdS$_3$ from the worldsheet and the AdS$_3$/CFT$_2$ duality

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