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In this paper, we give a simple description of Donaldson-Thomas (DT)-invariants of double quivers without potential as the multiplicity of the Steinberg character in some representation associated with the quiver. When the dimension vector is indivisible, we use this description to express these DT-invariants as the Poincaré polynomial of some singular quiver varieties. Finally, we explain the connections with [ 6 ] where DT-invariants are expressed as the graded multiplicities of the trivial representation of some Weyl group in the cohomology of some nonsingular quiver varieties attached to an extended quiver.

DT-Invariants of Quivers and the Steinberg Character of GL n