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001-es BibID:BIBFORM108027
035-os BibID:(cikkazonosító)035 (WOS)000751946700019 (Scopus)85123679647
Első szerző:Iwamoto, Sho
Cím:Sterile neutrino dark matter in a U(1) extension of the standard model / Sho Iwamoto, Károly Seller, Zoltán Trócsányi
Dátum:2022
ISSN:1475-7516
Megjegyzések:We explore the parameter space of a U(1) extension of the standard model - also called the super-weak model - from the point of view of explaining the observed dark matter energy density in the Universe. The new particle spectrum contains a complex scalar singlet and three right-handed neutrinos, among which the lightest one is the dark matter candidate. We explore both freeze-in and freeze-out mechanisms of dark matter production. In both cases, we find regions in the plane of the super-weak coupling vs. the mass of the new gauge boson that are not excluded by current experimental constraints. These regions are distinct and the one for freeze-out will be explored in searches for neutral gauge boson in the near future. JCAP01(2022)035
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Journal of Cosmology and Astroparticle Physics. - 2022 : 1 (2022), p. 1-30. -
További szerzők:Seller Károly Trócsányi Zoltán (1961-) (fizikus)
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001-es BibID:BIBFORM108061
035-os BibID:(cikkazonosító)062 (WOS)000779813100006 (Scopus)85128410375
Első szerző:Márián István Gábor (fizikus)
Cím:Vacuum energy and renormalization of the field-independent term / I. G. Márián, U. D. Jentschura, N. Defenu, A. Trombettoni, I. Nándori
Dátum:2022
ISSN:1475-7516
Megjegyzések:Due to its construction, the nonperturbative renormalization group (RG) evolution of the constant, field-independent term (which is constant with respect to field variations but depends on the RG scale k) requires special care within the Functional Renormalization Group (FRG) approach. In several instances, the constant term of the potential has no physical meaning. However, there are special cases where it receives important applications. In low dimensions (d = 1), in a quantum mechanical model, this term is associated with the ground-state energy of the anharmonic oscillator. In higher dimensions (d = 4), it is identical to the A term of the Einstein equations and it plays a role in cosmic inflation. Thus, in statistical field theory, in flat space, the constant term could be associated with the free energy, while in curved space, it could be naturally associated with the cosmological constant. It is known that one has to use a subtraction method for the quantum anharmonic oscillator in d = 1 to remove the k 2 term that appears in the RG flow in its high-energy (UV) limit in order to recover the correct results for the ground-state energy. The subtraction is needed because the Gaussian fixed point is missing in the RG flow once the constant term is included. However, if the Gaussian fixed point is there, no further subtraction is required. Here, we propose a subtraction method for k(4) and k(2) terms of the UV scaling of the RG equations for d = 4 dimensions if the Gaussian fixed point is missing in the RG flow with the constant term. Finally, comments on the application of our results to cosmological models are provided.
Tárgyszavak:Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Journal of Cosmology and Astroparticle Physics. - 2022 : 03 (2022), p. -. -
További szerzők:Jentschura, Ulrich David (fizikus) Defenu, N. Trombettoni, Andrea Nándori István (1973-) (fizikus)
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Intézményi repozitóriumban (DEA) tárolt változat
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