In ADAMANT: Another Day, Another Cosmology, Russell Seitz writes "Astrophysicists Liang Gao and Tom Theuns have floated an alternative to the theory of primordial matter condensing into star-forming clouds withing clumps of cold dark matter that does not interact with radiation. In their computer model, dark matter can emit radiation,and radiation pressure would resist clumping forces and cause elongation of dark matter concentrations instead."

"Their paper in Science suggests such warm dark matter would stretch out into million solar mass filaments kiloparsecs long , attracting primordial hydrogen and helium gas to form the first stars and nucleate supermassive black holes in galactic centers."

Very interesting, and worth a read.