Dark Matter Search: Galaxies & Astronomy

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The Search for Dark Matter

The Problem: Roughly 80% of the Universe’s mass is believed to be dark matter, but the particle that makes up this dark matter remains unknown after six decades of searching.
Leading candidates: WIMPs, primordial black holes, and axions are potential candidates. Axions are currently a leading focus.

New Approach to detecting Axions

Researchers: A team from the University of Copenhagen (led by oleg Ruchayskiy) along with collaborators from other institutions (Institute for Astronomy and Astrophysics, Taras Shevchenko National University of Kyiv, and Bogolyubov Institute for Theoretical Physics).
Method: Utilizing Active Galactic Nuclei (AGNs) – luminous galactic cores powered by supermassive black holes – as natural particle accelerators. They are looking for how axions might be produced as electromagnetic radiation passes through the magnetic fields of galaxy clusters.
Key Innovation: Combining data from multiple sources to turn what would normally be random noise into a recognizable pattern.
Publication: their findings are detailed in the paper “Constraints on axion-like particles from active galactic nuclei seen through galaxy clusters” published in Nature Astronomy.Why this Approach is Significant

Alternative to Expensive Accelerators: Traditional particle searches rely on expensive and complex accelerators like the Large Haddon Collider. This method uses existing cosmological phenomena.
Other Cosmic Accelerators: Other proposed methods involve using neutron stars, black holes, and colliding stellar remnants as particle accelerators.
Early Results: The team observed 32 SMBHs and found a signal that could be evidence of axion-like particles (ALPs). Ruchayskiy describes it as a “tantalizing hint.”

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