  Coulomb blockaded transport of topological superconducting nanowires provides
an opportunity to probe the localization of states at both ends of the system
in a two-terminal geometry. In addition, it provides a way for checking for
subgap states away from the leads. At the same time, Coulomb blockade transport
is difficult to analyze because of the interacting nature of the problem
arising from the nonperturbative Coulomb interaction inherent in the
phenomenon. Here we show that the Coulomb blockade transport can be modeled at
the same level of complexity as quantum point contact tunneling that has
routinely been used in mesoscopic physics to understand nanowire experiments
provided we consider the regime where the tunneling rate is below the
equilibration rate of the nanowire. This assumption leads us to a generalized
Meir-Wingreen formula for the tunnel conductance which we use to study various
features of the nanowire such as Andreev bound states, self-energy, and soft
gap. We anticipate that our theory will provide a route to interpret Coulomb
blockade transport in hybrid Majorana systems as resulting from features of the
nanowire, such as Andreev bound states and soft gaps.
