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- W4385077444 abstract "Abstract We demonstrate that the Peccei-Quinn-electromagnetic anomaly coefficient 𝒜 can be directly measured from axion string-induced cosmic birefringence by applying scattering transform to the anisotropic polarization rotation of the cosmic microwave background. This breaks the degeneracy between 𝒜 and the effective number of string loops in traditional inference analyses that are solely based on the spatial power spectrum of polarization rotation. Carrying out likelihood-based parameter inference on mock rotation realizations generated according to phenomenological string network models, we show that scattering transform is able to extract enough non-Gaussian information to clearly distinguish a number of discrete 𝒜 values, for instance 𝒜=1/9, 1/3, 2/3, in the ideal case of noise-free rotation reconstruction, and, to a lesser but interesting degree at reconstruction noise levels comparable to that expected for the proposed CMB-HD concept. In the event of a statistical detection of cosmic birefringence by Stage III or IV CMB experiments, our technique can be applied to test the stringy nature of the birefringence pattern and extract fundamental information about the smallest unit of charge in theories beyond the Standard Model." @default.
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- W4385077444 date "2023-07-01" @default.
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- W4385077444 title "Testing charge quantization with axion string-induced cosmic birefringence" @default.
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- W4385077444 doi "https://doi.org/10.1088/1475-7516/2023/07/052" @default.
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