  Understanding the normal-metal state transport in twisted bilayer graphene
near magic angle is of fundamental importance as it provides insights into the
mechanisms responsible for the observed strongly correlated insulating and
superconducting phases. Here we provide a rigorous theory for phonon-dominated
transport in twisted bilayer graphene describing its unusual signatures in the
resistivity (including the variation with electron density, temperature, and
twist angle) showing good quantitative agreement with recent experiments. We
contrast this with the alternative Planckian dissipation mechanism that we show
is incompatible with available experimental data. An accurate treatment of the
electron-phonon scattering requires us to go well beyond the usual treatment,
including both interband and intraband processes, considering the
finite-temperature dynamical screening of the electron-phonon matrix element,
and going beyond the linear Dirac dispersion. In addition to explaining the
observations in currently available experimental data, we make concrete
predictions that can be tested in ongoing experiments.
