# Lower bound on the electroweak wall velocity from hydrodynamic instability

## Abstract

The subsonic expansion of bubbles in a strongly first-order electroweak phase transition is a convenient scenario for electroweak baryogenesis. For most extensions of the Standard Model, stationary subsonic solutions (i.e., deflagrations) exist for the propagation of phase transition fronts. However, deflagrations are known to be hydrodynamically unstable for wall velocities below a certain critical value. We calculate this critical velocity for several extensions of the Standard Model and compare with an estimation of the wall velocity. In general, we find a region in parameter space which gives stable deflagrations as well as favorable conditions for electroweak baryogenesis.

- Authors:

- IFIMAR (CONICET-UNMdP), Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Deán Funes (7600) 3350 Mar del Plata (Argentina)

- Publication Date:

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

- OSTI Identifier:
- 22454533

- Resource Type:
- Journal Article

- Resource Relation:
- Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 03; Other Information: PUBLISHER-ID: JCAP03(2015)051; OAI: oai:repo.scoap3.org:9749; 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; ASYMMETRY; COSMOLOGY; CRITICAL VELOCITY; GRAVITATIONAL WAVES; INSTABILITY; MATHEMATICAL SOLUTIONS; MATHEMATICAL SPACE; PHASE TRANSFORMATIONS; STANDARD MODEL

### Citation Formats

```
Mégevand, Ariel, Membiela, Federico Agustín, and Sánchez, Alejandro D.
```*Lower bound on the electroweak wall velocity from hydrodynamic instability*. United States: N. p., 2015.
Web. doi:10.1088/1475-7516/2015/03/051.

```
Mégevand, Ariel, Membiela, Federico Agustín, & Sánchez, Alejandro D.
```*Lower bound on the electroweak wall velocity from hydrodynamic instability*. United States. doi:10.1088/1475-7516/2015/03/051.

```
Mégevand, Ariel, Membiela, Federico Agustín, and Sánchez, Alejandro D. Fri .
"Lower bound on the electroweak wall velocity from hydrodynamic instability". United States.
doi:10.1088/1475-7516/2015/03/051.
```

```
@article{osti_22454533,
```

title = {Lower bound on the electroweak wall velocity from hydrodynamic instability},

author = {Mégevand, Ariel and Membiela, Federico Agustín and Sánchez, Alejandro D.},

abstractNote = {The subsonic expansion of bubbles in a strongly first-order electroweak phase transition is a convenient scenario for electroweak baryogenesis. For most extensions of the Standard Model, stationary subsonic solutions (i.e., deflagrations) exist for the propagation of phase transition fronts. However, deflagrations are known to be hydrodynamically unstable for wall velocities below a certain critical value. We calculate this critical velocity for several extensions of the Standard Model and compare with an estimation of the wall velocity. In general, we find a region in parameter space which gives stable deflagrations as well as favorable conditions for electroweak baryogenesis.},

doi = {10.1088/1475-7516/2015/03/051},

journal = {Journal of Cosmology and Astroparticle Physics},

number = 03,

volume = 2015,

place = {United States},

year = {Fri Mar 27 00:00:00 EDT 2015},

month = {Fri Mar 27 00:00:00 EDT 2015}

}

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