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Abstract: A scalar potential coupled to other fields of large disparate masses willexhibit power suppression of the quantum loop corrections from these massivefields. Quintessence fields in the dark energy regime and inflaton fieldsduring inflation often have a very large background field value. Thus any otherfield with its mass dependent on the quintessence-inflaton background fieldvalue through a moderate coupling will become very massive during the darkenergy-inflation phase and its quantum corrections to the scalar effectivepotential will be suppressed. This concept is developed in this paper using thedecoupling theorem. The problem then reduces to a quantitative question of thesize of suppression effects within the parameter space of coupling constants,scalar field background value and renormalization scale. Some numericalexamples are presented both for inflation and quintessence, but the approach isgeneral and can be applied to any scalar field effective potential. Theconsequences to dark energy of the decoupling effect developed here is that thequintessence field need not just be an incredibly weakly interacting field,often added as simply an add-on to generate dark energy and have no otherpurpose. Instead, this quintessence field could play a central role in theparticle physics dynamics at early times and then simply decouple at late timesbefore the onset of the dark energy phase. For inflation a consequence iscoupling of the inflaton to other fields can be much larger in certain models,without needing supersymmetry to control quantum corrections.



Autor: Mar Bastero-Gil, Arjun Berera, Brendan M. Jackson

Fuente: https://arxiv.org/







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