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• W2606381566 abstract "Compensated isocurvature perturbations (CIPs) are primordial fluctuations that balance baryon and dark-matter isocurvature to leave the total matter density unperturbed. The effects of CIPs on the cosmic microwave background (CMB) anisotropies are similar to those produced by weak lensing of the CMB: smoothing of the power spectrum and generation of non-Gaussian features. Here, an entirely new CIP contribution to the standard estimator for the lensing-potential power spectrum is derived. Planck measurements of the temperature and polarization power spectrum, as well as estimates of CMB lensing, are used to place limits on the variance of the CIP fluctuations on CMB scales, ${mathrm{ensuremath{Delta}}}_{mathrm{rms}}^{2}({R}_{mathrm{CMB}})$. The resulting constraint of ${mathrm{ensuremath{Delta}}}_{mathrm{rms}}^{2}({R}_{mathrm{CMB}})<4.3ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}3}$ at 95% confidence level (CL) using this new technique improves on past work by a factor of $ensuremath{sim}3$. We find that for Planck data our constraints almost reach the sensitivity of the optimal CIP estimator. The method presented here is currently the most sensitive probe of the amplitude of a scale-invariant CIP power spectrum, ${A}_{mathrm{CIP}}$, placing an upper limit of ${A}_{mathrm{CIP}}<0.017$ at 95% CL. Future measurements of the large-scale CMB lensing-potential power spectrum could probe CIP amplitudes as low as ${mathrm{ensuremath{Delta}}}_{mathrm{rms}}^{2}({R}_{mathrm{CMB}})=8ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}5}$ at 95% CL (corresponding to ${A}_{mathrm{CIP}}=3.2ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}$)." @default.
• W2606381566 created "2017-04-28" @default.
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• W2606381566 date "2017-10-11" @default.
• W2606381566 modified "2023-10-15" @default.
• W2606381566 title "Baryons still trace dark matter: Probing CMB lensing maps for hidden isocurvature" @default.
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• W2606381566 doi "https://doi.org/10.1103/physrevd.96.083508" @default.
• W2606381566 hasPublicationYear "2017" @default.
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