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Protected string spectrum in AdS3/CFT2 from worldsheet integrability
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DOI：10.1007/JHEP04(2017)091.png)
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摘要
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We derive the protected closed-string spectra of AdS(3)/CFT2 dual pairs with 16 supercharges at arbitrary values of the string tension and of the three-form fluxes. These follow immediately from the all-loop Bethe equations for the spectra of the integrable worldsheet theories. Further, representing the underlying integrable systems as spin chains, we find that their dynamics involves length-changing interactions and that protected states correspond to gapless excitations above the Berenstein-Maldacena-Nastase vacuum. In the case of AdS(3) x S-3 x T-4 the degeneracies of such operators precisely match those of the dual CFT2 and the supergravity spectrum. On the other hand, we find that for AdS(3) x S-3 x S-3 x S-1 there are fewer protected states than previous supergravity calculations had suggested. In particular, protected states have the same su(2) charge with respect to the two three spheres.
Keyword:
AdS-CFT Correspondence
Bethe Ansatz
Conformal Field Theory
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期刊
IF:
5.5
论文数:
3.9W
被引数:
13.7W
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