# Constrained inflaton due to a complex scalar

## Abstract

We reexamine inflation due to a constrained inflaton in the model of a complex scalar. Inflaton evolves along a spiral-like valley of special scalar potential in the scalar field space just like single field inflation. Sub-Planckian inflaton can induce sufficient e-foldings because of a long slow-roll path. In a special limit, the scalar spectral index and the tensor-to-scalar ratio has equivalent expressions to the inflation with monomial potential φ{sup n}. The favorable values for them could be obtained by varying parameters in the potential. This model could be embedded in a certain radiative neutrino mass model.

- Authors:

- Physics Department, Gadjah Mada University,Yogyakarta 55281 (Indonesia)
- (Japan)
- Institute for Theoretical Physics, Kanazawa University,Kanazawa 920-1192 (Japan)

- Publication Date:

- Sponsoring Org.:
- SCOAP3, CERN, Geneva (Switzerland)

- OSTI Identifier:
- 22458378

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 09; Other Information: PUBLISHER-ID: JCAP09(2015)039; OAI: oai:repo.scoap3.org:11804; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COSMOLOGICAL INFLATION; MASS; NEUTRINOS; POTENTIALS; SCALAR FIELDS; TENSOR FIELDS

### Citation Formats

```
Budhi, Romy H. S., Institute for Theoretical Physics, Kanazawa University,Kanazawa 920-1192, Kashiwase, Shoichi, and Suematsu, Daijiro.
```*Constrained inflaton due to a complex scalar*. United States: N. p., 2015.
Web. doi:10.1088/1475-7516/2015/09/039.

```
Budhi, Romy H. S., Institute for Theoretical Physics, Kanazawa University,Kanazawa 920-1192, Kashiwase, Shoichi, & Suematsu, Daijiro.
```*Constrained inflaton due to a complex scalar*. United States. doi:10.1088/1475-7516/2015/09/039.

```
Budhi, Romy H. S., Institute for Theoretical Physics, Kanazawa University,Kanazawa 920-1192, Kashiwase, Shoichi, and Suematsu, Daijiro. Mon .
"Constrained inflaton due to a complex scalar". United States.
doi:10.1088/1475-7516/2015/09/039.
```

```
@article{osti_22458378,
```

title = {Constrained inflaton due to a complex scalar},

author = {Budhi, Romy H. S. and Institute for Theoretical Physics, Kanazawa University,Kanazawa 920-1192 and Kashiwase, Shoichi and Suematsu, Daijiro},

abstractNote = {We reexamine inflation due to a constrained inflaton in the model of a complex scalar. Inflaton evolves along a spiral-like valley of special scalar potential in the scalar field space just like single field inflation. Sub-Planckian inflaton can induce sufficient e-foldings because of a long slow-roll path. In a special limit, the scalar spectral index and the tensor-to-scalar ratio has equivalent expressions to the inflation with monomial potential φ{sup n}. The favorable values for them could be obtained by varying parameters in the potential. This model could be embedded in a certain radiative neutrino mass model.},

doi = {10.1088/1475-7516/2015/09/039},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 09,

volume = 2015,

place = {United States},

year = {Mon Sep 14 00:00:00 EDT 2015},

month = {Mon Sep 14 00:00:00 EDT 2015}

}

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