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• W3099696983 endingPage "036" @default.
• W3099696983 startingPage "036" @default.
• W3099696983 abstract "We develop a linear perturbation theory for the spectral $y$-distortions of the cosmic microwave background (CMB). The $y$-distortions generated during the recombination epoch are usually negligible because the energy transfer due to the Compton scattering is strongly suppressed at that time, but they can be significant if there is a considerable amount of compensated isocurvature perturbation (CIP), which is not tightly constrained from the present CMB observations. The linear $y$-distortions explicitly depend on the baryon density fluctuations, therefore $y$ anisotropies can completely resolve the degeneracy between the baryon isocurvature perturbations and the cold dark matter ones. This novel method is free from lensing contaminations that can affect the previous approach to the CIPs based on the nonlinear modulation of the CMB anisotropies. We compute the cross correlation functions of the $y$-distortions with the CMB temperature and the $E$ mode polarization anisotropies. They are sensitive to the correlated CIPs parameterized by $f'equivmathcal P_{rm CIPzeta}/mathcal P_{zeta zeta}$ with $mathcal P_{zeta zeta}$ and $mathcal P_{rm CIPzeta}$ being the auto correlation of the adiabatic perturbations and the cross correlation between them and the CIPs. We investigate how well the $y$ anisotropies will constrain $f'$ in future observations such as those provided by a PIXIE-like and a PRISM-like survey, LiteBIRD and a cosmic variance limited (CVL) survey, taking into account the degradation in constraining power due to the presence of Sunyaev Zel'dovich effect from galaxy clusters. For example, our forecasts show that it is possible to achieve an upper limit of $f'< 2 times 10^{5}$ at 68% C.L. with LiteBIRD, and $f'<2times 10^{4}$ with CVL observations." @default.
• W3099696983 created "2020-11-23" @default.
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• W3099696983 date "2018-08-24" @default.
• W3099696983 modified "2023-09-26" @default.
• W3099696983 title "Exploring compensated isocurvature perturbations with CMB spectral distortion anisotropies" @default.
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• W3099696983 doi "https://doi.org/10.1088/1475-7516/2018/08/036" @default.
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