# Realising effective theories of tribrid inflation: are there effects from messenger fields?

## Abstract

Tribrid inflation is a variant of supersymmetric hybrid inflation in which the inflaton is a matter field (which can be charged under gauge symmetries) and inflation ends by a GUT-scale phase transition of a waterfall field. These features make tribrid inflation a promising framework for realising inflation with particularly close connections to particle physics. Superpotentials of tribrid inflation involve effective operators suppressed by some cutoff scale, which is often taken as the Planck scale. However, these operators may also be generated by integrating out messenger superfields with masses below the Planck scale, which is in fact quite common in GUT and/or flavour models. The values of the inflaton field during inflation can then lie above this mass scale, which means that for reliably calculating the model predictions one has to go beyond the effective theory description. We therefore discuss realisations of effective theories of tribrid inflation and specify in which cases effects from the messenger fields are expected, and under which conditions they can safely be neglected. In particular, we point out how to construct realisations where, despite the fact that the inflaton field values are above the messenger mass scale, the predictions for the observables are (to a goodmore »

- Authors:

- Department of Physics, University of Basel,Klingelbergstr. 82, CH-4056 Basel (Switzerland)
- (Werner-Heisenberg-Institut),Föhringer Ring 6, D-80805 München (Germany)

- Publication Date:

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

- OSTI Identifier:
- 22458382

- 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)055; OAI: oai:repo.scoap3.org:11932; 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; FLAVOR MODEL; GAUGE INVARIANCE; GRAND UNIFIED THEORY; MASS; MATTER; PHASE TRANSFORMATIONS; POTENTIALS; SUPERSYMMETRY

### Citation Formats

```
Antusch, Stefan, Max-Planck-Institut für Physik, and Nolde, David.
```*Realising effective theories of tribrid inflation: are there effects from messenger fields?*. United States: N. p., 2015.
Web. doi:10.1088/1475-7516/2015/09/055.

```
Antusch, Stefan, Max-Planck-Institut für Physik, & Nolde, David.
```*Realising effective theories of tribrid inflation: are there effects from messenger fields?*. United States. doi:10.1088/1475-7516/2015/09/055.

```
Antusch, Stefan, Max-Planck-Institut für Physik, and Nolde, David. Tue .
"Realising effective theories of tribrid inflation: are there effects from messenger fields?". United States.
doi:10.1088/1475-7516/2015/09/055.
```

```
@article{osti_22458382,
```

title = {Realising effective theories of tribrid inflation: are there effects from messenger fields?},

author = {Antusch, Stefan and Max-Planck-Institut für Physik and Nolde, David},

abstractNote = {Tribrid inflation is a variant of supersymmetric hybrid inflation in which the inflaton is a matter field (which can be charged under gauge symmetries) and inflation ends by a GUT-scale phase transition of a waterfall field. These features make tribrid inflation a promising framework for realising inflation with particularly close connections to particle physics. Superpotentials of tribrid inflation involve effective operators suppressed by some cutoff scale, which is often taken as the Planck scale. However, these operators may also be generated by integrating out messenger superfields with masses below the Planck scale, which is in fact quite common in GUT and/or flavour models. The values of the inflaton field during inflation can then lie above this mass scale, which means that for reliably calculating the model predictions one has to go beyond the effective theory description. We therefore discuss realisations of effective theories of tribrid inflation and specify in which cases effects from the messenger fields are expected, and under which conditions they can safely be neglected. In particular, we point out how to construct realisations where, despite the fact that the inflaton field values are above the messenger mass scale, the predictions for the observables are (to a good approximation) identical to the ones calculated in the effective theory treatment where the messenger mass scale is identified with the (apparent) cutoff scale.},

doi = {10.1088/1475-7516/2015/09/055},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 09,

volume = 2015,

place = {United States},

year = {Tue Sep 22 00:00:00 EDT 2015},

month = {Tue Sep 22 00:00:00 EDT 2015}

}