Quantum Entanglement of Dark Matter
J. Korean Phy. Soc. 2018; 73: 1596~1602
Published online November 30, 2018 © 2018 The Korean Physical Society.


Department of Renewable Rnergy, Jungwon University, Goesan 13557, Korea
Department of Physics, North Carolina State University, Raleigh, NC 27695, USA
Correspondence to: Jae-Weon Lee
Abstract
We suggest that dark matter in galactic halos has quantum entanglement, if dark matter is a Bose-Einstein condensation of ultra-light scalar particles (i.e., Fuzzy dark matter). In this model, any two regions of a galaxy are quantum entangled due to the quantum nature of the condensate. We calculate the entanglement entropy SE of a typical galactic halo, which turns out to be at least O(ln(M/m)), where M is the mass of the halo and m is the mass of a dark matter particle. The entanglement can be inferred from the rotation curves of the galaxy.
PACS numbers: 98.62.Gq, 95.35.+d, 03.75.Gg
Keywords: Dark matter, BEC, Entanglement, Galactic halos


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