https://doi.org/10.1140/epjc/s10052-022-10903-y
Regular Article - Theoretical Physics
Twisted strings in three-dimensional black holes
1
The Institute of Mathematical Sciences, Homi Bhabha National Institute (HBNI), IV Cross Road, C.I.T. Campus, Taramani, 600113, Chennai, India
2
Laboratoire de Physique de l’École Normale Supérieure CNRS, ENS, Université PSL, Sorbonne Université, Université de Paris, 75005, Paris, France
Received:
30
June
2022
Accepted:
9
October
2022
Published online:
14
October
2022
We revisit the classical dynamics of fundamental strings in BTZ black holes with NSNS flux. We analyze probe strings in the black hole background and determine their classical energy using a Nambu–Goto action. Three-dimensional gravity has a non-local effect on the metric surrounding a massive object which can be measured by winding strings. We also study the behaviour of short and long strings in the Wess–Zumino–Witten orbifold and show that their energy matches the long string probe analysis. In the process, we fix subtleties in the Lorentzian choice of NSNS flux. In Euclidean signature, we analyze the one-loop fundamental string partition function on the BTZ black hole and interpret the off-shell degrees of freedom as those of a coset orbifold. Finally, we speculate on how to identify the quantum Lorentzian string spectrum from the Euclidean orbifold partition function.
© The Author(s) 2022
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