A host of astrophysical measurements suggest that most of the matter in the Universe is an
invisible nonluminous substance that physicists call dark matter. Understanding the nature of
dark matter is one of the greatest challenges of modern physics and is of paramount importance
to our theories of cosmology and particle physics. This text explores one of the leading
hypotheses to explain dark matter: that it consists of ultralight bosons forming an oscillating
field that feebly interacts with light and matter. Many new experiments have emerged over the
last decade to test this hypothesis involving state-of-the-art microwave cavities precision
nuclear magnetic resonance (NMR) measurements dark matter radios and synchronized global
networks of atomic clocks magnetometers and interferometers. The editors have gathered
leading experts from around the world to present the theories motivating these searches
evidence about dark matter from astrophysics and the diverse experimental techniques employed
in searches for ultralight bosonic dark matter. The text provides a comprehensive and
accessible introduction to this blossoming field of research for advanced undergraduates
beginning graduate students or anyone new to the field with tutorials and solved problems in
every chapter. The multifaceted nature of the research - combining ideas and methods from
atomic molecular and optical physics nuclear physics condensed matter physics electrical
engineering particle physics astrophysics and cosmology - makes this introductory approach
attractive for beginning researchers as well as members of the broader scientific community.
This is an open access book.
