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Improving Cosmic Birefringence Constraints via Delensing

Anto Idicherian Lonappan
(
- UC, San Diego
)

Mar 6, 2025

17 pages

e-Print:

2503.04708 [astro-ph.CO]

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Abstract: (arXiv)

We present a study on using delensing to enhance cosmic birefringence measurements based on full-sky, map-based simulations. In our analysis, we neglect foreground contamination and instrumental systematics to isolate the intrinsic impact of delensing on both isotropic and anisotropic birefringence. For the isotropic case, assuming a constant rotation angle of

\beta = 0.35^\circ

, delensing reduces the lensing-induced variance in the EB power spectrum, yielding an improvement in sensitivity of approximately 10% at 6

\mu

K-arcmin noise and 25-40% at lower noise levels. For the anisotropic case, using simulations at 1

\mu

K-arcmin noise, we reconstruct the birefringence angle for a scale-invariant spectrum and mitigate lensing bias by delensing, achieving a 50% reduction in the leading

N_{(0)}

bias and a 30% improvement in the constraints on the amplitude

A_{CB}

. Our results demonstrate that delensing is an effective tool for enhancing the detectability of subtle parity-violating signals in the cosmic microwave background with forthcoming experiments such as the Simons Observatory, CMB-S4, and LiteBIRD.

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