Self-interacting dark matter
In astrophysics and particle physics, self-interacting dark matter (SIDM) is an alternative class of dark matter particles which have strong interactions, in contrast to the standard cold dark matter model (CDM). SIDM was postulated in 2000[1] as a solution to the core-cusp[2][3][4] problem. In the simplest models of DM self-interactions, a Yukawa-type potential and a force carrier φ mediates between two dark matter particles.[5] On galactic scales, DM self-interaction leads to energy and momentum exchange between DM particles. Over cosmological time scales this results in isothermal cores in the central region of dark matter haloes.
If the self-interacting dark matter is in hydrostatic equilibrium, its pressure and density follow:
where and are the gravitational potential of the dark matter and a baryon respectively. The equation naturally correlates the dark matter distribution to that of the baryonic matter distribution. With this correlation, the self-interacting dark matter can explain phenomena such as the Tully–Fisher relation.
Self-interacting dark matter has also been postulated as an explanation for the
See also
- MACS J0025.4-1222, astronomical observations that constrain DM self-interaction
- Abell 3827that was claimed as the first evidence of SIDM
- Strongly interacting massive particle (SIMP), proposed to explain cosmic ray data
- Lambda-CDM model
References
- S2CID 6669358.
- S2CID 4325561.
- ISSN 0004-6256.
- ISSN 0004-6256.
- PMID 21635025.
- S2CID 31554326.
- ^ Moskowitz, Clara (20 April 2015). "Dark Matter May Feel a "Dark Force" That the Rest of the Universe Does Not". Scientific American.
- , 16 June 2021.
- ^ "Dancing in the dark". The Economist. 9 March 2024.
Further reading
- Bertone, Gianfranco (2010). ISBN 978-0-521-76368-4.
- Musser, George (May 2000). "What's the Matter?". .
- Lawrence, Krauss (2000). ISBN 978-0465037414.