  In this paper we revisit the double cone wormhole introduced by Saad, Shenker
and Stanford (SSS), which was shown to reproduce the ramp in the spectral form
factor. As a first approximation we can say that this solution computes
$\textrm{Tr}[e^{-iKT}]$, a trace of the "evolution" operator that generates
Schwarzschild time translations on the two sided wormhole geometry. This point
of view leads to a simple way to compute the normalization factor of the
wormhole. When we have bulk matter fields, SSS suggested using a modified
evolution $\tilde K$ which involves a slightly complex geometry, so that we are
really computing $\textrm{Tr}[e^{-i\tilde{K}T}]$. We argue that, for general
black holes, the spectrum of $\tilde K$ is given by quasinormal mode
frequencies. We explain that this reproduces various features that were
previously predicted from the spectral form factor on hydrodynamics grounds. We
also give a general algebraic construction of the modified boost in terms of
operators constructed from half sided modular inclusions. For the special case
of JT gravity, we work out the backreaction of matter on the geometry of the
double cone and find that it deforms the geometry in an undesirable direction.
We finally give some comments on the possible physical interpretation of
$\tilde K$.

High Energy Physics - Theory;General Relativity and Quantum Cosmology