  Recent experiments on twisted bilayer graphene have shown a high-temperature
parent state with massless Dirac fermions and broken electronic flavor
symmetry; superconductivity and correlated insulators emerge from this parent
state at lower temperatures. We propose that the superconducting and correlated
insulating orders are connected by Wess-Zumino-Witten terms, so that defects of
one order contain quanta of another order and skyrmion fluctuations of the
correlated insulator are a "mechanism" for superconductivity. We present a
comprehensive listing of plausible low-temperature orders, and the parent
flavor symmetry breaking orders. The previously characterized topological
nature of the band structure of twisted bilayer graphene plays an important
role in this analysis.
