Paul M. Sutter is a research professor in astrophysics at SUNY Stony Brook University and the Flatiron Institute in New York City. He regularly appears on TV and podcasts, including 'Ask a Spaceman.' He is the author of two books, 'Your Place in the Universe' and 'How to Die in Space,' and is a regular contributor to Space.
Earth may be swimming through an ocean of dark matter — and waves in that invisible ocean lapping against our planet's upper atmosphere may generate detectable radio waves that allow us to finally find this elusive component of the universe, according to new theoretical research.
With that incredible lightness — millions of times lighter than the lightest known particles — dark matter could act in very strange ways. In particular, instead of appearing as individual point-like bullets, the dark matter would behave more like large waves that slosh around the cosmos. This would occur when the dark matter encountered a plasma and when the frequency of dark matter waves lined up with the frequency of plasma waves. When this happened, a resonance would occur, amplifying the interaction and producing radiation in the form of radio waves, the team’s models suggested.
Earth's ionosphere is the thin, hot layer of the upper atmosphere, and it consists of a loose collection of ionized particles — a plasma. It naturally has waves sloshing through it, and the researchers discovered that those waves can interact with waves of hypothetical dark matter that might be washing over Earth.
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