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Upadhye, A, Kwan, J, McCarthy, IG 
ORCID: 0000-0002-1286-483X, Salcido, J, Helly, JC, Kugel, R, Schaller, M, Schaye, J, Braspenning, J, Elbers, W, Frenk, CS, Van Daalen, MP, Vandenbroucke, B and Broxterman, JC
(2024)
Non-linear CMB lensing with neutrinos and baryons: FLAMINGO simulations versus fast approximations.
Monthly Notices of the Royal Astronomical Society, 529 (2).
pp. 1862-1876.
ISSN 0035-8711
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Non-linear CMB lensing with neutrinos and baryons FLAMINGO simulations versus fast approximations.pdf - Published Version Available under License Creative Commons Attribution. Download (5MB) | Preview |
Abstract
Weak lensing of the cosmic microwave background is rapidly emerging as a powerful probe of neutrinos, dark energy, and new physics. We present a fast computation of the non-linear CMB lensing power spectrum that combines non-linear perturbation theory at early times with power spectrum emulation using cosmological simulations at late times. Comparing our calculation with light-cones from the FLAMINGO 5.6 Gpc cube dark-matter-only simulation, we confirm its accuracy to () up to multipoles L = 3000 (L = 5000) for a νΛCDM cosmology consistent with current data. Clustering suppression due to small-scale baryonic phenomena such as feedback from active galactic nuclei can reduce the lensing power by. To our perturbation theory and emulator-based calculation, we add SP(k), a new fitting function for this suppression, and confirm its accuracy compared to the FLAMINGO hydrodynamic simulations to at L = 5000, with similar accuracy for massive neutrino models. We further demonstrate that scale-dependent suppression due to neutrinos and baryons approximately factorize, implying that a careful treatment of baryonic feedback can limit biasing neutrino mass constraints.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | 0201 Astronomical and Space Sciences; Astronomy & Astrophysics |
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press (OUP) |
| Date of acceptance: | 2 March 2024 |
| Date of first compliant Open Access: | 25 September 2024 |
| Date Deposited: | 25 Sep 2024 14:22 |
| Last Modified: | 04 Jul 2025 08:30 |
| DOI or ID number: | 10.1093/mnras/stae663 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/24269 |
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