CMB birefringence from axion strings


Long, A. (2024). CMB birefringence from axion strings. Perimeter Institute. https://pirsa.org/24030125


Long, Andrew. CMB birefringence from axion strings. Perimeter Institute, Mar. 26, 2024, https://pirsa.org/24030125


          @misc{ pirsa_PIRSA:24030125,
            doi = {10.48660/24030125},
            url = {https://pirsa.org/24030125},
            author = {Long, Andrew},
            keywords = {Particle Physics},
            language = {en},
            title = {CMB birefringence from axion strings},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {mar},
            note = {PIRSA:24030125 see, \url{https://pirsa.org}}

Andrew Long Rice University

Talk Type Scientific Series


A cosmological network of axion strings in our Universe today may leave its imprint on the polarization pattern of the cosmic microwave background radiation through the phenomenon of axion-string-induced birefringence. I will explain how this signal arises, discuss how it depends on the properties of the string network and the axion-photon coupling, describe how existing measurements of anisotropic birefringence place constraints on axion strings, and discuss how the non-Gaussian nature of this signal could be leveraged in searches with future data.


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