Messengers from the Early Universe: Cosmic Neutrinos and Other Light Relics

Daniel Green Mustafa A. Amin Joel Meyers Benjamin Wallisch Kevork N. Abazajian Muntazir Abidi Peter Adshead Zeeshan Ahmed Behzad Ansarinejad Robert Armstrong Carlo Baccigalupi Kevin Bandura Darcy Barron Nicholas Battaglia Daniel Baumann Keith Bechtol Charles Bennett Bradford Benson Florian Beutler Colin Bischoff Lindsey Bleem J. Richard Bond Julian Borrill Elizabeth Buckley-Geer Cliff Burgess John E. Carlstrom Emanuele Castorina Anthony Challinor Xingang Chen Asantha Cooray William Coulton Nathaniel Craig Thomas Crawford Francis-Yan Cyr-Racine Guido d'Amico Marcel Demarteau Olivier Doré Duan Yutong Joanna Dunkley Cora Dvorkin John Ellison Alexander van Engelen Stephanie Escoffier 1 Tom Essinger-Hileman Giulio Fabbian Jeffrey Filippini Raphael Flauger Simon Foreman George Fuller Marcos A.G. Garcia Juan García-Bellido Martina Gerbino Vera Gluscevic Satya Gontcho a Gontcho Krzysztof M. Górski Daniel Grin Evan Grohs Jon E. Gudmundsson Shaul Hanany Will Handley J. Colin Hill Christopher M. Hirata Renée Hložek Gilbert Holder Shunsaku Horiuchi Dragan Huterer Kenji Kadota Marc Kamionkowski Ryan E. Keeley Rishi Khatri Theodore Kisner Jean-Paul Kneib Lloyd Knox Savvas M. Koushiappas Ely D. Kovetz Benjamin l'Huillier Ofer Lahav Massimiliano Lattanzi Hayden Lee Michele Liguori Tongyan Lin Marilena Loverde Mathew Madhavacheril Kiyoshi Masui Jeff Mcmahon Matthew Mcquinn P. Daniel Meerburg Mehrdad Mirbabayi Pavel Motloch Suvodip Mukherjee 2 Julian B. Munõz Johanna Nagy Laura Newburgh Michael D. Niemack Andrei Nomerotski Lyman Page Francesco Piacentni Elena Pierpaoli Levon Pogosian Clement Pryke Giuseppe Puglisi Radek Stompor 3 Marco Raveri Christian L. Reichardt Benjamin Rose Graziano Rossi John Ruhl Emmanuel Schaan Michael Schubnell Katelin Schutz Neelima Sehgal Leonardo Senatore Hee-Jong Seo Blake D. Sherwin Sara Simon Anže Slosar Suzanne Staggs Albert Stebbins Aritoki Suzuki Eric R. Switzer Peter Timbie Matthieu Tristram 4 Mark Trodden Yu-Dai Tsai Caterina Umiltà Eleonora Di Valentino M. Vargas-Magaña Abigail Vieregg Scott Watson Thomas Weiler Nathan Whitehorn W.L.K. Wu Weishuang Xu Zhilei Xu Siavash Yasini Matias Zaldarriaga Gong-Bo Zhao Ningfeng Zhu Joe Zuntz
Abstract : The hot dense environment of the early universe is known to have produced large numbers of baryons, photons, and neutrinos. These extreme conditions may have also produced other long-lived species, including new light particles (such as axions or sterile neutrinos) or gravitational waves. The gravitational effects of any such light relics can be observed through their unique imprint in the cosmic microwave background (CMB), the large-scale structure, and the primordial light element abundances, and are important in determining the initial conditions of the universe. We argue that future cosmological observations, in particular improved maps of the CMB on small angular scales, can be orders of magnitude more sensitive for probing the thermal history of the early universe than current experiments. These observations offer a unique and broad discovery space for new physics in the dark sector and beyond, even when its effects would not be visible in terrestrial experiments or in astrophysical environments. A detection of an excess light relic abundance would be a clear indication of new physics and would provide the first direct information about the universe between the times of reheating and neutrino decoupling one second later.
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Submitted on : Wednesday, March 27, 2019 - 3:25:19 AM
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Daniel Green, Mustafa A. Amin, Joel Meyers, Benjamin Wallisch, Kevork N. Abazajian, et al.. Messengers from the Early Universe: Cosmic Neutrinos and Other Light Relics. Bull.Am.Astron.Soc., 2019, 51 (7), pp.159. ⟨hal-02080700⟩



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