ELKO field

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In cosmology and theoretical physics the ELKO field is a dark matter candidate.

The ELKO field was originally suggested in 2005 by D. V. Ahluwalia (then, under the name Ahluwalia-Khalilova) and D. Grumiller.[1] The name comes from the acronym of the original German term Eigenspinoren des LadungsKonjugationsOperators, designating spinors that are eigenspinors of the charge conjugation operator.

ELKO quantum fields fields describe spin-1/2 fermions with mass dimension one. Since the field has a mass dimensionality mismatch with standard model matter fields it was suggested as a dark matter candidate.[2] As a result of their scalar-like mass dimension they differ significantly from the mass dimension 3/2 Dirac fermions.[3]

A slightly old reference is a 2013 preprint.[4] The results following equation (102) need revision as the indicated integral does not vanish. There are now strong indications that using Elko a mass dimension one field of spin-1/2 fermions can be constructed to secure locality and Lorentz covariance. An up-to-date review is now available as an e-print [5]


  1. ^ D.V. Ahluwalia and D. Grumiller. Spin-Half Fermions with Mass Dimension One: Theory, Phenomenology, and Dark Matter. Journal of Cosmology and Astroparticle Physics, 2005:012, 2005.
  2. ^ D.V. Ahluwalia, C.Y. Lee, D. Schritt, and T.F. Watson. Local Fermionic Dark Matter with Mass Dimension One. Arxiv preprint arXiv:0804.1854v4, 2008
  3. ^ M. Dias, F. de Campos, J. M. Hoff da Silva. Exploring Elko typical signature. Physics Letters B, 706 (2012) 352. DOI:10.1016/j.physletb.2011.11.030
  4. ^ D. V. Ahluwalia. On a local mass dimension one Fermi field of spin one-half and the theoretical crevice that allows it. http://arxiv.org/abs/arXiv:1305.7509
  5. ^ Dharam Vir Ahluwalia. A Lorentz covariant local theory of fermions with mass dimension one. http://arxiv.org/abs/1601.03188