## Two-field analysis of no-scale supergravity inflation

## Abstract

Since the building-blocks of supersymmetric models include chiral superfields containing pairs of effective scalar fields, a two-field approach is particularly appropriate for models of inflation based on supergravity. In this paper, we generalize the two-field analysis of the inflationary power spectrum to supergravity models with arbitrary Kähler potential. We show how two-field effects in the context of no-scale supergravity can alter the model predictions for the scalar spectral index n _{s} and the tensor-to-scalar ratio r, yielding results that interpolate between the Planck-friendly Starobinsky model and BICEP2-friendly predictions. In particular, we show that two-field effects in a chaotic no-scale inflation model with a quadratic potential are capable of reducing r to very small values << 0.1. Here, we also calculate the non-Gaussianity measure f _{NL}, finding that is well below the current experimental sensitivity.

- Authors:

- King's College London, London (United Kingdom). Theoretical Particle Physics and Cosmology Group; European Organization for Nuclear Research (CERN), Geneva (Switzerland). Theory Div.
- Univ. of Minnesota, Minneapolis, MN (United States). William I. Fine Theoretical Physics Inst.
- Texas A & M Univ., College Station, TX (United States). George P. and Cynthia W. Mitchell Inst. for Fundamental Physics and Astronomy; Houston Advanced Research Center (HARC), Woodlands, TX (United States). Astroparticle Physics Group; Academy of Athens, Athens (Greece), Div. of Natural Sciences

- Publication Date:

- Research Org.:
- Univ. of Minnesota, Minneapolis, MN (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC)

- OSTI Identifier:
- 1454606

- Grant/Contract Number:
- SC0011842; FG03-95ER40917

- Resource Type:
- Accepted Manuscript

- Journal Name:
- Journal of Cosmology and Astroparticle Physics

- Additional Journal Information:
- Journal Volume: 2015; Journal Issue: 01; Journal ID: ISSN 1475-7516

- Publisher:
- Institute of Physics (IOP)

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS; inflation; supersymmetry and cosmology; particle physics - cosmology connection

### Citation Formats

```
Ellis, John, Garcia, Marcos A. G., Nanopoulos, Dimitri V., and Olive, Keith A. Two-field analysis of no-scale supergravity inflation. United States: N. p., 2015.
Web. doi:10.1088/1475-7516/2015/01/010.
```

```
Ellis, John, Garcia, Marcos A. G., Nanopoulos, Dimitri V., & Olive, Keith A. Two-field analysis of no-scale supergravity inflation. United States. doi:10.1088/1475-7516/2015/01/010.
```

```
Ellis, John, Garcia, Marcos A. G., Nanopoulos, Dimitri V., and Olive, Keith A. Thu .
"Two-field analysis of no-scale supergravity inflation". United States. doi:10.1088/1475-7516/2015/01/010. https://www.osti.gov/servlets/purl/1454606.
```

```
@article{osti_1454606,
```

title = {Two-field analysis of no-scale supergravity inflation},

author = {Ellis, John and Garcia, Marcos A. G. and Nanopoulos, Dimitri V. and Olive, Keith A.},

abstractNote = {Since the building-blocks of supersymmetric models include chiral superfields containing pairs of effective scalar fields, a two-field approach is particularly appropriate for models of inflation based on supergravity. In this paper, we generalize the two-field analysis of the inflationary power spectrum to supergravity models with arbitrary Kähler potential. We show how two-field effects in the context of no-scale supergravity can alter the model predictions for the scalar spectral index ns and the tensor-to-scalar ratio r, yielding results that interpolate between the Planck-friendly Starobinsky model and BICEP2-friendly predictions. In particular, we show that two-field effects in a chaotic no-scale inflation model with a quadratic potential are capable of reducing r to very small values << 0.1. Here, we also calculate the non-Gaussianity measure fNL, finding that is well below the current experimental sensitivity.},

doi = {10.1088/1475-7516/2015/01/010},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 01,

volume = 2015,

place = {United States},

year = {2015},

month = {1}

}

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