#  Lisa Randall and Matthew Reece discuss dark matter with Physics World  

 





March 11, 2014

 

 

"Last year Randall and Reece – along with JiJi Fan and Andrey Katz – proposed a different type of dark matter called partially interacting dark matter (PIDM). Such dark-matter particles interact via an electromagnetic-like interaction, perhaps involving the emission of "dark photons". The four physicists argued that a small fraction of dark matter could be PIDM without much affecting the known dark-matter distribution of galaxies. Furthermore, they argued that the interactions between PIDM particles could be strong enough to form a dark galactic disc that shadows the visible disc (see ["Do dark-matter discs envelop galaxies?"](http://physicsworld.com/cws/article/news/2013/jun/03/do-dark-matter-discs-envelop-galaxies))."

For the full article click [here](http://physicsworld.com/cws/article/news/2014/mar/11/did-dark-matter-help-kill-off-the-dinosaurs).



 

 

 



 

 

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