Self-interacting dark matter
In astrophysics and particle physics, self-interacting dark matter (SIDM) assumes dark matter has self-interactions, in contrast to the collisionless dark matter assumed by the Lambda-CDM model. SIDM was postulated in 2000 to resolve a number of conflicts between observations and N-body simulations (of cold collisionless dark matter only) on the galactic scale and smaller. It was also used to explain the 2015 observations of ESO 146-5 the core of the Abell 3827 galaxy cluster. However, the latter finding has since been discounted based on further observations and modelling of the cluster.
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- Moskowitz, Clara (20 April 2015). "Dark Matter May Feel a "Dark Force" That the Rest of the Universe Does Not". Scientific American.
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- Sharpe, Dan (2017). Exploring Composite Dark Matter with SIDM and CDM. ISBN 1520306318.