{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/patchy-kinetic-sunyaev-zel-dovich-effect-with","title":"Patchy Kinetic Sunyaev-Zel'dovich Effect with Controlled Reionization History and Morphology","arxiv_id":"2203.04337","date":"2022-03-08","proceeding":null,"authors":["Nianyi Chen","Hy Trac","Suvodip Mukherjee","Renyue Cen"],"abstract":"Using the novel semi-numerical code for reionization AMBER, we model the patchy kinetic Sunyaev-Zel'dovich (kSZ) effect by directly specifying the reionization history with the redshift midpoint $z_\\mathrm{mid}$, duration $\\Delta_\\mathrm{z}$, and asymmetry $A_\\mathrm{z}$. We further control the ionizing sources and radiation through the minimum halo mass $M_\\mathrm{h}$ and the radiation mean free path $\\lambda_\\mathrm{mfp}$. AMBER reproduces the free electron number density and the patchy kSZ power spectrum of radiation-hydrodynamic simulations at the target resolution ($1\\,{\\rm Mpc}/h$) with matched reionization parameters. With a suite of $(2\\,{\\rm Gpc}/h)^3$ simulations using AMBER, we first constrain the redshift midpoint $6.0<z_{\\rm mid}<8.9$ using the Planck2018 Thomson optical depth result (95\\% CL). Then, assuming $z_{\\rm mid}=8$, we find that the amplitude of $D^{\\rm pkSZ}_{\\ell=3000}$ scales linearly with the duration of reionization $\\Delta_z$, and is consistent with the $1\\sigma$ upper limit from the South Pole Telescope (SPT) results up to $\\Delta_z<5.1$ ($\\Delta_z$ encloses $5\\%$ to $95\\%$ ionization). Moreover, a shorter $\\lambda_{\\rm mfp}$ can lead to a $\\sim 10\\%$ lower $D^{\\rm pkSZ}_{\\ell=3000}$ and a flatter slope in the $\\Delta_z-D^{\\rm pkSZ}_{\\ell=3000}$ scaling relation, thereby affecting the constraints on $\\Delta_z$ at $\\ell=3000$. Allowing $z_{\\rm mid}$ and $\\lambda_{\\rm mfp}$ to vary simultaneously, we get spectra consistent with the SPT result ($95\\%$ CL) up to $\\Delta_z=12.8$ (but $A_z>8$ is needed to ensure an end of reionization before $z=5.5$). We show that constraints on the asymmetry require $\\sim 0.1\\,\\mu k^2$ measurement accuracy at multipoles other than $\\ell=3000$. Finally, we find that the amplitude and shape of the kSZ spectrum are only weakly sensitive to $M_h$ under a fixed reionization history and radiation mean-free path.","url_abs":"https://arxiv.org/abs/2203.04337v1","url_pdf":"https://arxiv.org/pdf/2203.04337v1.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"patchy-kinetic-sunyaev-zel-dovich-effect-with","repo_url":"https://github.com/hytrac/amber","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}