Lancaster EPrints

Thermally-generated Gauge Singlet Scalars as Self-Interacting Dark Matter.

McDonald, John (2002) Thermally-generated Gauge Singlet Scalars as Self-Interacting Dark Matter. Physical Review Letters, 88 (9). 091304. ISSN 1079-7114

Full text not available from this repository.

Abstract

We show that a gauge singlet scalar S, with a coupling to the Higgs doublet of the form λSS†SH†H and with the S mass entirely generated by the Higgs expectation value, has a thermally generated relic density ΩS≈0.3 if mS≈(2.9–10.5) (ΩS/0.3)1/5(h/0.7)2/5 MeV. Remarkably, this is very similar to the range [mS = (6.6–15.4)η2/3 MeV] required in order for the self-interaction (η/4) (S†S)2 to account for self-interacting dark matter when η is not much smaller than 1. The corresponding coupling is λS≈(2.7×10-10–3.6×10-9) (ΩS/0.3)2/5(h/0.7)4/5, implying that such scalars are very weakly coupled to the standard model sector.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Additional Information: Development of the author's pioneering minimal model for cold dark matter (Gauge singlet scalars as cold dark matter, Phys.Rev. D50 3637). Predicts 1-10 MeV scalar particles which can account for self-interacting dark matter. These have since become a possible explanation for the 511 MeV gamma-ray line observed by INTEGRAL. RAE_import_type : Journal article RAE_uoa_type : Physics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 2303
Deposited By: ep_importer
Deposited On: 03 Apr 2008 15:59
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 20:26
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2303

Actions (login required)

View Item