Probing Anisotropic Cosmic Birefringence with Foreground-Marginalised SPT B-mode Likelihoods
Year: 2025
Type: article
Abstract: In this work, we construct foreground-marginalised versions of the SPT-3G D1 and SPTpol cosmic microwave background (CMB) B-mode polarisation likelihoods. The compression is performed using the CMB-lite framework and we use the resulting data sets to constrain anisotropic cosmic birefringence, parametrised by the amplitude of a scale-invariant anisotropic birefringence spectrum, . Using the new SPT-3G data we report a 95 % upper limit on of 1.2 × 10 − 4 , which tightens to 0.53 × 10 − 4 when imposing a prior on the amplitude of gravitational lensing based on CMB lensing reconstruction analyses. These are the tightest constraints on anisotropic birefringence from BB power spectrum measurements to-date, demonstrating the constraining power of the South Pole Telescope. The likelihoods used in this work are made publicly available at https://github.com/lbalkenhol/candl_data
Source: The Open Journal of Astrophysics
DOI: 10.33232/001c.147459
Institution: Institut d'Astrophysique de Paris
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: G1655552079, Uncovering New Physics with Advances in the Cosmic Microwave Background, Graduate Research Fellowship Program (GRFP), G3257494214, G433322167, G434337789, G58316358, G6273510985, G6868755465, South Pole Telescope Operations and Data Products, South Pole Telescope Operations and Data Products
OpenAlex ID: W4415318696
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