PBS Space Time Season 2020 Episode 6 Are Axions Dark Matter?

Are Axions Dark Matter? is the sixth episode of season 2020 for the popular show PBS Space Time, which explores the mysteries of the universe. In this episode, the hosts delve into the question of whether axions, a hypothetical particle, could be the cause of dark matter, a mysterious substance that makes up approximately 85% of the matter in the universe.

The episode begins by introducing the concept of dark matter, explaining how it was first theorized and how scientists have been studying it for decades. The hosts explain that dark matter is believed to exist because of its gravitational effects on visible matter, but it has never been directly observed. They also discuss some of the existing theories about what dark matter is, including the possibility that it is made up of weakly interacting massive particles (WIMPs) or axions.

The hosts then dive into the explanation behind the axion particle, discussing its history and how it was first proposed as a solution to a problem in particle physics. They explain that axions were originally thought to be extremely light, but recent advancements have suggested that they could actually be much heavier, making them a more viable candidate for dark matter.

Throughout the episode, the hosts interview numerous experts in the field, discussing their research and the challenges in studying both dark matter and axions. They also explain how scientists are attempting to detect axions, through experiments such as the ADMX experiment and the MADMAX experiment, both of which are mentioned in the episode.

As the episode progresses, the hosts explore some recent developments in the field, including the possible discovery of a dark matter signal in the XENON1T experiment, which they explain may have implications for the axion hypothesis. They also discuss the search for dark matter in the Large Hadron Collider and other experiments, and the challenges in identifying dark matter amidst a sea of other particles.

Overall, the episode presents a fascinating exploration of the question of whether axions could be the cause of dark matter, and the challenges and opportunities in studying these particles. The hosts provide clear explanations and engaging discussions with experts in the field, making it an accessible entry point for anyone interested in understanding the mysteries of the universe.