Feebly interacting particles (FIPs) are subatomic particles defined by having extremely suppressed interactions with the Standard Model (SM) bosons and / or fermions. These particles are potential thermal dark matter candidates, extending the model of weakly interacting massive particles (WIMPs) to include weakly interacting sub-eV particles (WISPs) and others. FIP physics is also known as dark-sector physics.[1]

Candidates

FIP candidates could be massive (FIMP / WIMP) or massless and coupled to the SM particles through some minimal coupling strength.[1] The light FIPs are theorized to be dark matter candidates, and, they provide an explanation for the origin of neutrino masses and CP symmetry in strong interactions.[2]

Neutrinos technically qualify as FIPs, but usually when the acronym "FIP" is used, it is intended to refer to some other, as-yet unknown particle. Cai, Cacciapaglia, and Lee (2022)[3] proposed massive gravitons as feebly Interacting particle candidates.[3][4]

See also

  • WIMP – weakly interacting massive particle
  • WISP – weakly interacting sub-eV / slight / slender particle

References

  1. 1 2 Lanfranchi, Gaia; Pospelov, Maxim; Schuster, Philip (4 November 2020). "The search for feebly-interacting particles". Annual Review of Nuclear and Particle Science. 71: 279–313. arXiv:2011.02157. doi:10.1146/annurev-nucl-102419-055056. S2CID 226246183.
  2. ↑ Agrawal, Prateek; Bauer, Martin; Beacham, James; Berlin, Asher; Boyarsky, Alexey; Cebrian, Susana; et al. (24 February 2021). "Feebly-interacting particles: FIPs 2020 Workshop report". The European Physical Journal C. 81 (11): 1015. arXiv:2102.12143. Bibcode:2021EPJC...81.1015A. doi:10.1140/epjc/s10052-021-09703-7. S2CID 232035757.
  3. 1 2 Cai, Haiying; Cacciapaglia, Giacomo; Lee, Seung J. (23 February 2022). "Massive gravitons as feebly interacting dark matter candidates". Physical Review Letters. 128 (8): 081806. arXiv:2107.14548. Bibcode:2022PhRvL.128h1806C. doi:10.1103/PhysRevLett.128.081806. ISSN 0031-9007. PMID 35275667. S2CID 236635132.
  4. ↑ Lea, Robert (9 April 2022). "Dark matter could be a cosmic relic from extra dimensions". livescience.com. Retrieved 22 April 2022.


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