How does dark matter decrease predict CMB anystropies?
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Measured matter overdensities today are
, which means that at the time of photon decoupling, they must have been . But this would mean that (assuming adiabatic perturbations), the CMB temperature anysotropies would be
, which contradicts the observed value .
How does dark matter solve this issue? This derivation only assumes that
and that we can relate matter and radiation densities through .
, which means that at the time of photon decoupling, they must have been . But this would mean that (assuming adiabatic perturbations), the CMB temperature anysotropies would be
, which contradicts the observed value .
How does dark matter solve this issue? This derivation only assumes that
and that we can relate matter and radiation densities through .
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Composite bosons. Composite particles (such as hadrons, nuclei, and atoms) can be bosons or fermions depending on their constituents. More precisely, because of the relation between spin and statistics, a particle containing an even number of fermions is a boson, since it has integer spin.
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