Titlebook: Cosmological Probes of Light Relics; Benjamin Wallisch Book 2019 The Editor(s) (if applicable) and The Author(s), under exclusive license

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Soziale Gerechtigkeit und Demokratie,e new degrees of freedom, many of which contain new light species that are efficiently produced in the early universe. In this chapter, we provide the connection between cosmological observables and these additional light relics predicted beyond the Standard Model. Apart from order-of-magnitude esti

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Soziale Gerechtigkeit und Demokratie,he potential to explore a fundamentally new territory of physics beyond the Standard Model. Specifically, observations may become sensitive to any light relics that have ever been in thermal equilibrium with the Standard Model. In this chapter, we demonstrate that even the absence of a detection wou

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Alexander Bogner,Helge Torgersens through the sensitivity to this effect that the recent CMB data has provided a robust detection of free-streaming neutrinos. In this chapter, we revisit the phase shift of the CMB anisotropy spectrum as a probe of new physics. The phase shift is particularly interesting because its physical origin

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Alexander Bogner,Helge Torgersen constrained to be less than ten percent of the total energy density in radiation. Upcoming cosmic microwave background (CMB) experiments, however, have the potential to measure the radiation density at the one-percent level, which is close to well-motivated theoretical targets. In this chapter, we

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Cosmological Probes of Light Relics978-3-030-31098-1Series ISSN 2190-5053 Series E-ISSN 2190-5061

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