PhysRevD.71.087302.pdf (120.78 kB)
Dark matter of weakly interacting massive particles and the QCD equation of state
journal contribution
posted on 2023-06-08, 00:28 authored by Mark HindmarshMark Hindmarsh, Owe PhilipsenWeakly Interacting Massive Particles (WIMPs) of mass m freeze-out at a temperature Tf~=m/25, i.e. in the range 400 MeV40 GeV for a particle in the typical mass range 101000 GeV. The WIMP relic density, which depends on the effective number of relativistic degrees of freedom at Tf, may be measured to better than 1% by Planck, warranting comparable theoretical precision. Recent theoretical and experimental advances in the understanding of high-temperature QCD show that the quark gluon plasma departs significantly from ideal behavior up to temperatures of several GeV, necessitating an improvement of the cosmological equation of state over those currently used. We discuss how this increases the relic density by approximately 1.53.5% in benchmark mSUGRA models, with an uncertainty in the QCD corrections of 0.51%. We point out what further work is required to achieve a theoretical accuracy comparable with the expected observational precision, and speculate that the effective number of degrees of freedom at Tf may become measurable in the foreseeable future.
History
Publication status
- Published
File Version
- Published version
Journal
Physical Review DISSN
1550-7998Publisher
American Physical SocietyExternal DOI
Issue
8Volume
71Page range
087302Department affiliated with
- Physics and Astronomy Publications
Notes
Collaboration co-leader, concerned with cosmological implications. We show that recent advances in the understanding of the equation of state of strongly interacting particles have detectable effects for future precision determinations of the abundance of weakly interacting dark matter.Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06First Open Access (FOA) Date
2016-03-22First Compliant Deposit (FCD) Date
2016-11-10Usage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC