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We explain a new relationship between formal group laws and ring
spectra in stable homotopy theory. We study a ring spectrum denoted
DB which depends on a commutative ring B and is closely related
to the topological André–Quillen homology of B. We present an
explicit construction which to every 1–dimensional and commutative
formal group law F over B associates a morphism of ring spectra
F*:HZ→DB from the Eilenberg–MacLane ring spectrum
of the integers. We show that formal group laws account for all such ring
spectrum maps, and we identify the space of ring spectrum maps between
HZ and DB. That description involves formal group law data
and the homotopy units of the ring spectrum DB.
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