A novel way to determine the scale of inflation

作者：Enqvist Kari^*; Hardwick Robert J; Tenkanen Tommi; Vennin Vincent; Wands David

来源：Journal of Cosmology and Astroparticle Physics, 2018, 2018(2): 006.

DOI：10.1088/1475-7516/2018/02/006

• cosmology of theories beyond the SM
• dark matter theory
• inflation
• particle physics - cosmology connection

We show that in the Feebly Interacting Massive Particle (FIMP) model of Dark Matter (DM), one may express the inflationary energy scale H-* as a function of three otherwise unrelated quantities, the DM isocurvature perturbation amplitude, its mass and its self-coupling constant, independently of the tensor-to-scalar ratio. The FIMP model assumes that there exists a real scalar particle that alone constitutes the DM content of the Universe and couples to the Standard Model via a Higgs portal. We consider carefully the various astrophysical, cosmological and model constraints, accounting also for variations in inflationary dynamics and the reheating history, to derive a robust estimate for H-* that is con fined to a relatively narrow range. We point out that, within the context of the FIMP DM model, one may thus determine H-* reliably even in the absence of observable tensor perturbations.

• 出版日期2018-2