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Simulating Partial Sky Cosmic Microwave Background Maps with 3D Fast Fourier Transforms
Mariona Giner Mascarell, Emory F. Bunn
https://arxiv.org/abs/2507.15703

Simulating Partial Sky Cosmic Microwave Background Maps with 3D Fast Fourier Transforms
Simulated maps of the microwave background (CMB) radiation are generally created using one of two methods: all-sky simulations use the spherical harmonic transform, while maps covering small areas approximate the sky as flat, allowing the use of fast Fourier transforms (FFTs). Current and near-future experiments, particularly ones like CMB S4, will cover areas too large for the flat-sky approximation but significantly less than the full sky. In this regime, it can be more efficient to simulate …

Patchy Helium and Hydrogen Reionization from the Kinetic Sunyaev-Zel'dovich Effect and Galaxies
Neha Anil Kumar, Mesut \c{C}al{\i}\c{s}kan, Selim C. Hotinli, Marc Kamionkowski, Simone Ferraro, Kendrick Smith
https://arxiv.org/abs/2506.11188

Patchy Helium and Hydrogen Reionization from the Kinetic Sunyaev-Zel'dovich Effect and Galaxies
Upcoming cosmic microwave background (CMB) experiments will measure temperature fluctuations on small angular scales with unprecedented precision, enabling improved measurements of the kinetic Sunyaev-Zel'dovich (kSZ) effect. This secondary anisotropy has emerged as a valuable probe of the distribution of ionized electrons in the post-recombination Universe. Although the sensitivity of the kSZ effect has recently been utilized to study the high-redshift epoch of hydrogen (H) reionization, its r…