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CMB Spectral Distortions from Cooling Macroscopic Dark Matter
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abstract
We propose a new mechanism by which dark matter (DM) can affect the early universe. The hot interior of a macroscopic DM, or macro, can behave as a heat reservoir so that energetic photons are emitted from its surface. This results in spectral distortions (SDs) of the cosmic microwave background. The SDs depend on the density and the cooling processes of the interior, and the surface composition of the Macros. We use neutron stars as a model for nuclear-density Macros and find that the spectral distortions are mass-independent for fixed density. In our work, we find that, for Macros of this type that constitute 100$\%$ of the dark matter, the $\mu$ and $y$ distortions can be above detection threshold for typical proposed next-generation experiments such as PIXIE.
Forward citations
Cited by 3 Pith papers
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The Glow of Axion Quark Nugget Dark Matter: (IV) CMB Spectral and Anisotropy Signatures
Axion quark nugget dark matter would create a μ-type CMB spectral distortion near 6×10⁻⁸ with y near 2×10⁻⁹, detectable by proposed missions, while leaving CMB anisotropies essentially unchanged.
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Microwave Spectro-Polarimetry of Matter and Radiation across Space and Time
This white paper proposes a large space mission combining a polarized imager, a filter-bank spectrometer, and absolute spectrometers to map the microwave sky from 10 to 2000 GHz and probe cosmology across cosmic time.
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New Horizons in Cosmology with Spectral Distortions of the Cosmic Microwave Background
A white paper advocating for a CMB spectral distortion mission to detect predicted mu, y, and recombination signals and probe inflation, dark matter, and particle physics.
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