# Higgs-portal assisted Higgs inflation with a sizeable tensor-to-scalar ratio

## Abstract

We show that the Higgs portal interactions involving extra dark Higgs field can save generically the original Higgs inflation of the standard model (SM) from the problem of a deep non-SM vacuum in the SM Higgs potential. Specifically, we show that such interactions disconnect the top quark pole mass from inflationary observables and allow multi-dimensional parameter space to save the Higgs inflation, thanks to the additional parameters (the dark Higgs boson mass m {sub φ}, the mixing angle α between the SM Higgs H and dark Higgs Φ, and the mixed quartic coupling) affecting RG-running of the Higgs quartic coupling. The effect of Higgs portal interactions may lead to a larger tensor-to-scalar ratio, 0.08 ∼< r ∼< 0.1, by adjusting relevant parameters in wide ranges of α and m {sub φ}, some region of which can be probed at future colliders. Performing a numerical analysis we find an allowed region of parameters, matching the latest Planck data.

- Authors:

- Quantum Universe Center, Korea Institute for Advanced Study, 85 Hoegiro Dongdaemungu, Seoul 02455 (Korea, Republic of)
- Departament de Física Teòrica and IFIC, Universitat de València-CSIC, E-46100, Burjassot (Spain)

- Publication Date:

- OSTI Identifier:
- 22680050

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 02; Other Information: Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COUPLING; HIGGS BOSONS; HIGGS MODEL; INFLATIONARY UNIVERSE; INTERACTIONS; MASS; MIXING ANGLE; NUMERICAL ANALYSIS; SPACE; STANDARD MODEL; T QUARKS

### Citation Formats

```
Kim, Jinsu, Ko, Pyungwon, and Park, Wan-Il, E-mail: kimjinsu@kias.re.kr, E-mail: pko@kias.re.kr, E-mail: Wanil.Park@uv.es.
```*Higgs-portal assisted Higgs inflation with a sizeable tensor-to-scalar ratio*. United States: N. p., 2017.
Web. doi:10.1088/1475-7516/2017/02/003.

```
Kim, Jinsu, Ko, Pyungwon, & Park, Wan-Il, E-mail: kimjinsu@kias.re.kr, E-mail: pko@kias.re.kr, E-mail: Wanil.Park@uv.es.
```*Higgs-portal assisted Higgs inflation with a sizeable tensor-to-scalar ratio*. United States. doi:10.1088/1475-7516/2017/02/003.

```
Kim, Jinsu, Ko, Pyungwon, and Park, Wan-Il, E-mail: kimjinsu@kias.re.kr, E-mail: pko@kias.re.kr, E-mail: Wanil.Park@uv.es. Wed .
"Higgs-portal assisted Higgs inflation with a sizeable tensor-to-scalar ratio". United States.
doi:10.1088/1475-7516/2017/02/003.
```

```
@article{osti_22680050,
```

title = {Higgs-portal assisted Higgs inflation with a sizeable tensor-to-scalar ratio},

author = {Kim, Jinsu and Ko, Pyungwon and Park, Wan-Il, E-mail: kimjinsu@kias.re.kr, E-mail: pko@kias.re.kr, E-mail: Wanil.Park@uv.es},

abstractNote = {We show that the Higgs portal interactions involving extra dark Higgs field can save generically the original Higgs inflation of the standard model (SM) from the problem of a deep non-SM vacuum in the SM Higgs potential. Specifically, we show that such interactions disconnect the top quark pole mass from inflationary observables and allow multi-dimensional parameter space to save the Higgs inflation, thanks to the additional parameters (the dark Higgs boson mass m {sub φ}, the mixing angle α between the SM Higgs H and dark Higgs Φ, and the mixed quartic coupling) affecting RG-running of the Higgs quartic coupling. The effect of Higgs portal interactions may lead to a larger tensor-to-scalar ratio, 0.08 ∼< r ∼< 0.1, by adjusting relevant parameters in wide ranges of α and m {sub φ}, some region of which can be probed at future colliders. Performing a numerical analysis we find an allowed region of parameters, matching the latest Planck data.},

doi = {10.1088/1475-7516/2017/02/003},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 02,

volume = 2017,

place = {United States},

year = {Wed Feb 01 00:00:00 EST 2017},

month = {Wed Feb 01 00:00:00 EST 2017}

}