sentence: In an `` extended model '' which includes hot dark matter in the form of neutrinos , then if the `` physical baryon density '' Ωbh2 is estimated at about 0.023 ( this is different from the ` baryon density ' Ωb expressed as a fraction of the total matter/energy density , which as noted above is about 0.046 ) , and the corresponding cold dark matter density Ωch2 is about 0.11 , the corresponding neutrino density Ωvh2 is estimated to be less than 0.0062 .
question: what is _ formed _ as something ?
answers: hot dark matter