CMB-S4 Technology Book, First Edition

Maximilian H. Abitbol , Zeeshan Ahmed , Darcy Barron , Ritoban Basu Thakur , Amy N. Bender , Bradford A. Benson , Colin A. Bischoff , Sean A. Bryan

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John E. Carlstrom Clarence L. Chang David T. Chuss Kevin T. Crowley Ari Cukierman Tijmen de Haan Matt Dobbs Tom Essinger-Hileman Jeffrey P. Filippini Ken Ganga Jon E. Gudmundsson Nils W. Halverson Shaul Hanany Shawn W. Henderson Charles A. Hill Shuay-Pwu P. Ho Johannes Hubmayr Kent Irwin Oliver Jeong Bradley R. Johnson Sarah A. Kernasovskiy John M. Kovac Akito Kusaka Adrian T. Lee Salatino Maria Philip Mauskopf Jeff J. McMahon Lorenzo Moncelsi Andrew W. Nadolski Johanna M. Nagy Michael D. Niemack Roger C. O'Brient Stephen Padin Stephen C. Parshley Clement Pryke Natalie A. Roe Karwan Rostem John Ruhl Sara M. Simon Suzanne T. Staggs Aritoki Suzuki Eric R. Switzer Osamu Tajima Keith L. Thompson Peter Timbie Gregory S. Tucker Joaquin D. Vieira Abigail G. Vieregg Benjamin Westbrook Edward J. Wollack Ki Won Yoon Karl S. Young Edward Y. Young

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keywords cmb-s4booksciencecosmictechnologycurrentdarkexperiment

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CMB-S4 is a proposed experiment to map the polarization of the Cosmic Microwave Background (CMB) to nearly the cosmic variance limit for angular scales that are accessible from the ground. The science goals and capabilities of CMB-S4 in illuminating cosmic inflation, measuring the sum of neutrino masses, searching for relativistic relics in the early universe, characterizing dark energy and dark matter, and mapping the matter distribution in the universe have been described in the CMB-S4 Science Book. This Technology Book is a companion volume to the Science Book. The ambitious science goals of CMB-S4, a "Stage-4" experiment, require a step forward in experimental capability from the current Stage=II experiments. To guide this process, we summarize the current state of CMB instrumentation technology, and identify R&D efforts necessary to advance it for use in CMB-S4. The book focuses on technical challenges in four broad areas: Telescope Design; Receiver Optics; Focal-Plane Optical Coupling; and Focal-Plane Sensor and Readout.

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Neutrino self-interactions in post-reionization era: Lyman-$\alpha$, 21-cm and cross-spectra
astro-ph.CO 2026-04 unverdicted novelty 4.0

Fisher forecasts indicate that Lyα-21cm cross-spectra with PUMA and CMB data can improve constraints on neutrino self-interaction strength G_eff by 1-2 orders of magnitude over CMB alone.