What goes wrong with baryon-only cosmologies?
•Texts examines isothermal and adiabatic perturbations.  There are problems.
–We know baryons are not dominant.
–Big issue is that temperature fluctuations observed are not big enough:
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–Should be > 0.001 for this analysis, required to be even in general, but are much smaller.
–It’s a bit more complex than this, but the general arguments hold.
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