  Realism about quantum theory naturally leads to realism about the quantum
state of the universe. It leaves open whether it is a pure state represented by
a wave function, or an impure one represented by a density matrix. I
characterize and elaborate on Density Matrix Realism, the thesis that the
universal quantum state is objective but can be impure. To clarify the thesis,
I compare it with Wave Function Realism, explain the conditions under which
they are empirically equivalent, consider two generalizations of Density Matrix
Realism, and answer some frequently asked questions. I end by highlighting an
implication for scientific realism.
