# A novel way to determine the scale of inflation

Research output: Research - peer-review › Article

### Standard

**A novel way to determine the scale of inflation.** / Enqvist, Kari; Hardwick, Robert J.; Tenkanen, Tommi; Vennin, Vincent; Wands, David.

Research output: Research - peer-review › Article

### Harvard

*Journal of Cosmology and Astroparticle Physics*, vol 2018, 006. DOI: 10.1088/1475-7516/2018/02/006

### APA

*Journal of Cosmology and Astroparticle Physics*,

*2018*, [006]. DOI: 10.1088/1475-7516/2018/02/006

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### Bibtex

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### RIS

TY - JOUR

T1 - A novel way to determine the scale of inflation

AU - Enqvist,Kari

AU - Hardwick,Robert J.

AU - Tenkanen,Tommi

AU - Vennin,Vincent

AU - Wands,David

PY - 2018/2/6

Y1 - 2018/2/6

N2 - 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 confined 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.

AB - 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 confined 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.

KW - astro-ph.CO

KW - hep-ph

KW - RCUK

KW - STFC

KW - ST/J001546/1

KW - ST/N504245/1

KW - ST/N000668/1

KW - cosmology of theories beyond the SM

KW - dark matter theory

KW - inflation

KW - particle physics - cosmology connection

UR - http://iopscience.iop.org/article/10.1088/1475-7516/2018/02/006/meta

U2 - 10.1088/1475-7516/2018/02/006

DO - 10.1088/1475-7516/2018/02/006

M3 - Article

VL - 2018

JO - Journal of Cosmology and Astroparticle Physics

T2 - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

M1 - 006

ER -

ID: 8656826