# Gravitational wave signals from short-lived topological defects in the MSSM

## Abstract

Supersymmetric theories, including the minimal supersymmetric standard model, usually contain many scalar fields whose potentials are absent in the exact supersymmetric limit and within the renormalizable level. Since their potentials are vulnerable to the finite energy density of the Universe through supergravity effects, these flat directions have nontrivial dynamics in the early Universe. Recently, we have pointed out that a flat direction may have a positive Hubble induced mass term during inflation whereas a negative one after inflation. In this case, the flat direction stays at the origin of the potential during inflation and then obtain a large vacuum expectation value after inflation. After that, when the Hubble parameter decreases down to the mass of the flat direction, it starts to oscillate around the origin of the potential. In this paper, we investigate the dynamics of the flat direction with and without higher dimensional superpotentials and show that topological defects, such as cosmic strings and domain walls, form at the end of inflation and disappear at the beginning of oscillation of the flat direction. We numerically calculate their gravitational signals and find that the observation of gravitational signals would give us information of supersymmetric scale, the reheating temperature of themore »

- Authors:

- Kavli IPMU (WPI), UTIAS, The University of Tokyo,Kashiwa, Chiba 277-8583 (Japan)
- (United States)
- (Japan)

- Publication Date:

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

- OSTI Identifier:
- 22458391

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 10; Other Information: PUBLISHER-ID: JCAP10(2015)021; OAI: oai:repo.scoap3.org:12204; 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; ENERGY DENSITY; EXPECTATION VALUE; GRAVITATIONAL WAVES; HUBBLE EFFECT; RENORMALIZATION; SCALAR FIELDS; STANDARD MODEL; STRING MODELS; SUPERGRAVITY; SUPERSYMMETRY; TOPOLOGY; UNIVERSE

### Citation Formats

```
Kamada, Ayuki, Department of Physics and Astronomy, University of California,Riverside, CA, 92507, Yamada, Masaki, and ICRR, The University of Tokyo,Kashiwa, Chiba 277-8582.
```*Gravitational wave signals from short-lived topological defects in the MSSM*. United States: N. p., 2015.
Web. doi:10.1088/1475-7516/2015/10/021.

```
Kamada, Ayuki, Department of Physics and Astronomy, University of California,Riverside, CA, 92507, Yamada, Masaki, & ICRR, The University of Tokyo,Kashiwa, Chiba 277-8582.
```*Gravitational wave signals from short-lived topological defects in the MSSM*. United States. doi:10.1088/1475-7516/2015/10/021.

```
Kamada, Ayuki, Department of Physics and Astronomy, University of California,Riverside, CA, 92507, Yamada, Masaki, and ICRR, The University of Tokyo,Kashiwa, Chiba 277-8582. Fri .
"Gravitational wave signals from short-lived topological defects in the MSSM". United States.
doi:10.1088/1475-7516/2015/10/021.
```

```
@article{osti_22458391,
```

title = {Gravitational wave signals from short-lived topological defects in the MSSM},

author = {Kamada, Ayuki and Department of Physics and Astronomy, University of California,Riverside, CA, 92507 and Yamada, Masaki and ICRR, The University of Tokyo,Kashiwa, Chiba 277-8582},

abstractNote = {Supersymmetric theories, including the minimal supersymmetric standard model, usually contain many scalar fields whose potentials are absent in the exact supersymmetric limit and within the renormalizable level. Since their potentials are vulnerable to the finite energy density of the Universe through supergravity effects, these flat directions have nontrivial dynamics in the early Universe. Recently, we have pointed out that a flat direction may have a positive Hubble induced mass term during inflation whereas a negative one after inflation. In this case, the flat direction stays at the origin of the potential during inflation and then obtain a large vacuum expectation value after inflation. After that, when the Hubble parameter decreases down to the mass of the flat direction, it starts to oscillate around the origin of the potential. In this paper, we investigate the dynamics of the flat direction with and without higher dimensional superpotentials and show that topological defects, such as cosmic strings and domain walls, form at the end of inflation and disappear at the beginning of oscillation of the flat direction. We numerically calculate their gravitational signals and find that the observation of gravitational signals would give us information of supersymmetric scale, the reheating temperature of the Universe, and higher dimensional operators.},

doi = {10.1088/1475-7516/2015/10/021},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 10,

volume = 2015,

place = {United States},

year = {Fri Oct 09 00:00:00 EDT 2015},

month = {Fri Oct 09 00:00:00 EDT 2015}

}