Gravitational index of the D1-D5-P black string

Abstract

We present saddle-points of the Euclidean Gravitational Path Integral (GPI) corresponding to the supersymmetric index of the D1-D5-P black string. These saddles are complex, supersymmetric, non-extremal solutions of 10-dimensional IIB supergravity theory with arbitrary inverse temperature $β$. The solutions carry fixed monopole charges $Q_1$, $Q_5$, $Q_n$, and angular momentum $J_L$ equal to the extremal supersymmetric black string. Crucially, the solutions have fixed angular velocity $Ω_{R} = - 2 πi /β$, which is the chemical potential dual to $J_R$. This implements the insertion of $(-1)^{F}$ in the GPI. The Gibbons-Hawking on-shell action is temperature-independent and agrees with the supersymmetric index of the extremal black string carrying the same monopole charges. Upon taking a finite-temperature near-horizon decoupling limit, we obtain solutions of the form $S^3$ fibered over BTZ. Although these near-horizon solutions have finite holomorphic and anti-holomorphic modular parameters, their on-shell action reproduces the Cardy formula of the holomorphic elliptic genus of the dual D1-D5 SCFT$_2$.