Speaker
Description
Cosmic birefringence is a hypothetical signature of parity violation in the electromagnetic interaction, and would manifest as a rotation of CMB polarisation as the signal travels through our Universe. This effect is degenerate with instrument polarisation, making it a calibration and data analysis challenge to constrain. In this talk, I will focus on the sensitivity to cosmic birefringence of BICEP3, a CMB telescope located at the South Pole and observing at 95GHz. I will discuss the relative contributions of instrumental noise, astrophysical signals, and systematics, yielding a sensitivity to the birefringence angle of σ(α)=0.078° for 2 years of observations. I will also compare how these contributions are projected to evolve as we expand the dataset from the published 2 years (2017-2018) to 8 years of observations (2017-2024). Finally, I will provide some perspective on how future experiments will expand birefringence searches, with expected improvements such as delensing, multi-frequency observations, and increased CMB polarisation sensitivity.
Reference: BICEP/Keck XVIII: Measurement of BICEP3 polarization angles and consequences for constraining cosmic birefringence and inflation, The BICEP/Keck Collaboration, 2024 (accepted for publication in PRD)
| Would you be interested in presenting a poster if the conference is oversubcribed? | No |
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