We study the possibility of dark matter in the form of heavy neutrinos from a fourth lepton family with helicity suppressed couplings such that dark matter is produced thermally via annihilations in the early Universe. We present all possible constraints for this scenario coming from LHC and collider physics, underground direct detectors, neutrino telescopes, and indirect astrophysical searches. Although we embed the WIMP candidate within a model of composite dynamics, the majority of our results are model independent and applicable to all models where heavy neutrinos with suppressed couplings account for the dark matter abundance.
ISI Document Delivery No.: AC7LU Times Cited: 0 Cited Reference Count: 104 Hapola, Tuomas Jaervinen, Matti Kouvaris, Chris Panci, Paolo Virkajarvi, Jussi European Commission [PITN-GA-2010-264564]; European Union [316165, PIF-GA-2011-300984]; EU [MIS 375734]; European Union (European Social Fund, ESF); Greek national funds through the Operational Program "Education and Lifelong Learning" of the National Strategic Reference Framework (NSRF) under "Funding of proposals that have received a positive evaluation in the 3rd and 4th Call of ERC Grant Schemes" We would like to thank Marco Cirelli, Mads Frandsen and Marco Nardecchia for useful discussions. The CP3-Origins centre is partially funded by the Danish National Research Foundation, grant number DNRF90. The work of T. H. was supported by the European Commission through the "LHCPhenoNet" Initial Training Network PITN-GA-2010-264564. The work of M.J. was supported in part by European Union's Seventh Framework Programme under grant agreements (FP7-REGPOT-2012-2013-1) no 316165, PIF-GA-2011-300984, the EU program "Thales" MIS 375734 and was also co-financed by the European Union (European Social Fund, ESF) and Greek national funds through the Operational Program "Education and Lifelong Learning" of the National Strategic Reference Framework (NSRF) under "Funding of proposals that have received a positive evaluation in the 3rd and 4th Call of ERC Grant Schemes". 0 IOP PUBLISHING LTD BRISTOL J COSMOL ASTROPART P