Kavli Affiliate: Emil J. Martinec
| First 5 Authors: Emil J. Martinec, Emil J. Martinec, , ,
| Summary:
Supergravity solutions describing supersymmetric rotating bound states of NS
fivebranes, fundamental strings and momentum can sometimes have an ergoregion
but no horizon. In such supersymmetric ergoregions, there is an unusual feature
that there exist BPS "excitations" that cost negative (or zero) energy as
measured from asymptotic infinity. We study the spectrum of supergravity and
string excitations of these backgrounds using their worldsheet description as
gauged Wess-Zumino-Witten (WZW) models, and construct their holographic map to
transitions in the dual spacetime CFT. The backgrounds generically contain
orbifold singularities, and we exhibit vertex operators corresponding to
twisted sector ground states localized at the orbifold fixed points. The gauged
WZW model thus provides a valuable tool to explore the stringy structure of
such heavy BPS states in $AdS_3/CFT_2$.
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