Correlated primordial perturbations in light of CMB and large scale structure data

摘要: We use cosmic microwave background (CMB) and large scale structure data to constrain cosmological models where the primordial perturbations have both an adiabatic a cold dark matter (CDM) isocurvature component. allow for possible correlation between modes, different spectral indices power in each mode their correlation. do likelihood analysis with 11 independent parameters discuss effect of choosing pivot definition amplitude parameters. The upper limit fraction is 18% around $k=0.01\text{ }\text{ }{\mathrm{M}\mathrm{p}\mathrm{c}}^{\ensuremath{-}1}$. For smaller wavenumbers stays about same. larger wavenumbers, very values index are favored, which makes problematic, but fractions seem be allowed. ${n}_{\mathrm{i}\mathrm{s}\mathrm{o}}g2$ positive ${n}_{\mathrm{i}\mathrm{s}\mathrm{o}}l2$ negative favored. nonadiabatic contribution CMB temperature variance 7.5%. Of standard parameters, determination CDM density ${\ensuremath{\omega}}_{c}$ sound horizon angle $\ensuremath{\theta}$ (or Hubble constant ${H}_{0}$) affected most by presence correlated contribution. baryon ${\ensuremath{\omega}}_{b}$ nearly retains its ``adiabatic value''.