Dark Matter and Neutron Star Collisions

By: April Carson

In the vast expanse of the cosmos, where stars collide and galaxies dance, lies one of the greatest enigmas of modern physics: dark matter. It's a substance that comprises a significant portion of the universe's mass, yet its nature eludes our direct observation. However, recent research into violent collisions between neutron stars may shed light on this elusive phenomenon.

Neutron stars, the remnants of massive stellar explosions, are cosmic laboratories of extreme density and exotic physics. These collapsed stellar cores, comprised mostly of neutrons, have long intrigued scientists as potential sites for the production of dark matter. One particular candidate that has captured the imagination of physicists for decades is the axion.

The axion, a hypothetical particle first proposed in the 1970s, has emerged as a promising contender for dark matter. Named after a brand of laundry detergent, this elusive particle was originally introduced to solve a perplexing puzzle in the realm of particle physics known as the strong-CP problem. Now, a recent study published in Physical Review Letters has reignited interest in the axion as a possible component of dark matter.

Led by physicist Bhupal Dev from Washington University in St. Louis, the study delves into the aftermath of a collision between two neutron stars located a staggering 130 million light-years away. This cataclysmic event, observed in 2017, offers a unique opportunity to probe the nature of dark matter through the study of axion-like particles (ALPs).

Axion-like particles, a broader class of hypothetical dark matter candidates, are believed to interact with photons in distinct ways. In the aftermath of the neutron star merger, ALPs generated during the collision decay into photons, creating detectable electromagnetic signals that can be observed by telescopes such as the Fermi Large Area Telescope (Fermi-LAT).

"This multimessenger study allows us to probe new physics beyond the Standard Model," explains Dev, highlighting the significance of combining spectral and temporal data from such cosmic events.

While dark matter remains invisible to conventional detection methods, its gravitational influence on visible matter provides compelling evidence for its existence. Various candidates, including Weakly Interacting Massive Particles (WIMPs) and axions, have been proposed to explain the mysteries of dark matter.

Unlike black holes, which trap even light within their gravitational grasp, neutron stars emit electromagnetic radiation, offering astronomers a glimpse into their dense interiors. Through processes such as photon coalescence and the Primakoff process, axions could emerge from the intense astrophysical environments created by neutron star mergers.

As scientists continue to unravel the complexities of the cosmos, each collision, each observation, brings us closer to understanding the fundamental nature of dark matter. The study of neutron star collisions provides not only a window into the extreme physics of the universe but also a pathway to unlocking the secrets of dark matter, one collision at a time.

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