Higgs stability-bound and fermionic dark matter

• Verfasst von: Held, Aaron [VerfasserIn]
• Verfasst von: Sondenheimer, René [VerfasserIn]
• Titel: Higgs stability-bound and fermionic dark matter
• Verf.angabe: Aaron Held and René Sondenheimer
• E-Jahr: 2019
• Jahr: 25 February 2019
• Umfang: 24 S.
• Fussnoten: Gesehen am 18.07.2019
• Titel Quelle: Enthalten in: Journal of high energy physics
• Ort Quelle: Berlin : Springer, 1997
• Jahr Quelle: 2019
• Band/Heft Quelle: (2019,2) Artikel-Nummer 166, 24 Seiten
• ISSN Quelle: 1029-8479
• DOI: doi:10.1007/JHEP02(2019)166
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Non-perturbative renormalization
• K10plus-PPN: 1669404137

Abstract

Higgs-portal interactions of fermionic dark matter - in contrast to fermions coupled via Yukawa interactions - can have a stabilizing effect on the standard-model Higgs potential. A non-perturbative renormalization-group analysis reveals that, similar to higher-order operators in the Higgs potential itself, the fermionic portal coupling can increase the metastability scale by only about one order of magnitude. Assuming a thermal freeze-out via the Higgs-portal coupling, this regime of very weakly coupled dark matter is in conflict with relic-density constraints. Conversely, fermionic dark matter with the right relic abundance requires either a low cutoff scale of the effective field theory or a strongly interacting scalar sector. This results in a triviality problem in the scalar sector which persists at the non-perturbative level. The corresponding breakdown of the effective field theory suggests a larger dark sector to be present not too far above the dark-fermion mass-scale.