Inside the mysterious collapse of dark matter halos

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 Inside the mysterious collapse of dark matter halos


Physicists have unveiled a new way to simulate a mysterious form of dark matter that can collide with itself but not with normal matter. This self-interacting dark matter may trigger a dramatic collapse inside dark matter halos, heating and densifying their cores in surprising ways. Until now, this crucial middle ground of behavior was nearly impossible to model accurately. The new code makes these simulations faster, more precise, and accessible enough to run on a laptop.
A new simulation reveals how colliding dark matter particles could trigger cosmic collapses that shape galaxies—and possibly seed black holes. Credit: AI/ScienceDaily.com

For nearly 100 years, dark matter has remained one of the biggest unanswered questions in cosmology. Although it cannot be seen directly, its gravitational influence shapes galaxies and the large-scale structure of the universe. At the Perimeter Institute, two physicists are investigating how a particular form of dark matter, known as self-interacting dark matter (SIDM), may influence the way cosmic structures grow and change over time

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