  In this work, we revisit the problem of finding entanglement islands in 2d
Jackiw-Teitelboim (JT) gravity. We implement the following adjustments to the
traditional setup: (1) we do not explicitly couple to a non-gravitating system,
instead we implement only pure absorption into a fiducial detector, (2) we
utilise the operationally defined renormalised matter entanglement entropy, as
defined by the boundary observer's wordline. We show that this leads to a
unitary Page curve that we explicitly compute, with an island outside of the
event horizon. Next, we extend the analysis to a charged and/or supersymmetric
black hole. We find that in a certain regime the charged black hole grows first
as it emits superradiation before eventually dissipating. We obtain similar
results when embedding the system in a supersymmetric setting.

High Energy Physics - Theory