  The key result in the paper concerns two transformations, Phi(rho, psi) and
B_t(psi) on states on the algebra of non-commutative polynomials, or
equivalently on joint distributions of d-tuples of non-commuting operators.
These transformations are related to free probability: Phi intertwines the
action of B_t and the free convolution with the semigroup {rho_t}. The maps
{B_t} were introduced by Belinschi and Nica as a semigroup of transformations
such that B_1 is the bijection between infinitely divisible distributions in
the Boolean and free probability theories. They proved the intertwining
property above for a single-variable version of the map Phi and the particular
case of the free heat semigroup. The more general two-variable map Phi comes,
not from free probability, but from the theory of two-state algebras, also
called the conditionally free probability theory, introduced by Bozejko,
Leinert, and Speicher. Orthogonality of the c-free versions of the Appell
polynomials, investigated in arXiv:0803.4279, is closely related to the
single-variable map Phi. On the other hand, more general free Meixner families
behave well under all the transformations above, and provide clues to their
general behavior. Besides the evolution equation, other results include the
positivity of the map Phi and descriptions of its fixed points and range.
