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Advances in High Energy Physics
Volume 2013, Article ID 915897, 15 pages
Review Article

Heavy Chiral Fermions and Dark Matter

1Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan
2Department of Physics and Center for Mathematics and Theoretical Physics, National Central University, Chungli 32001, Taiwan

Received 22 June 2012; Accepted 4 November 2012

Academic Editor: Tao Han

Copyright © 2013 Johan Alwall and Jusak Tandean. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Dark matter presents perhaps one of the most compelling direct indications of new physics beyond the standard model with three generations of fermions. In this paper, we survey several scenarios for dark matter in association with a fourth generation of chiral matter. The surveyed scenarios include stable heavy neutrino dark matter, composite dark matter consisting of stable heavy quarks, heavy quarks as mediators between the dark and visible sectors, and the four-generation standard model with the minimal addition of a stable real scalar field. We discuss the basic properties of the models, direct search constraints on their dark matter, and their collider phenomenology, as well as the possible effects of dark matter on the searches for a Higgs boson in the presence of four generations. We also comment on the potential implication of the recent observation of a Higgs-like new particle at the LHC.