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: | 25 Mar 2013 13:41 |
| Identification Number: | |
| URI: | http://eprints.lancs.ac.uk/id/eprint/2303 |
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