  Using a definition of the bulk frame within 2d Jackiw-Teitelboim gravity, we
go into the bulk from the Schwarzian boundary. Including the path integral over
the Schwarzian degrees of freedom, we discuss the quantum gravitational Unruh
effect and the Planckian black-body spectrum of the thermal atmosphere. We
analyze matter entanglement entropy and how the entangling surface should be
defined in quantum gravity. Finally, we reanalyze a semi-classical model for
black hole evaporation studied in JHEP 1607, 139 (2016) and compute the
entanglement between early and late Hawking radiation, illustrating information
loss in the semi-classical framework.
