# Nuclear matter in the early universe

## Abstract

Recently, extreme conditions have been obtained in ultra-relativistic heavy ion collisions at RHIC and at the Large Hadron collider. It is believed that these conditions are similar to the ones of the early Universe, in the time between 10{sup −6}s and 1s, approximately. In this work, the hadrons produced in this range of time will be studied, considering some aspects of the systems produced in the heavy-ion collisions. We will study a phase posterior to the phase transition (in fact it is believed to be a crossover) from the quark-gluon plasma, that is the hadronic phase of the Universe. We will show the model proposed in [1], considering the hadronic matter described by a relativistic model (similar to the Walecka model), considering particles described by quantum equations in a curved spacetime. This curvature is due to the mass and to the strong interactions that appears in the energy-momentum tensor. The set of the equations is proposed in the Robertson-Walker metric, and some approximate solutions are obtained.

- Authors:

- Depto de Física - CFM - Universidade Federal de Santa Catarina - Florianópolis - SC - CP. 476 - CEP 88.040 - 900 - Brazil (Brazil)
- Centro Brasileiro de Pesquisas Físicas - CBPF - Rio de Janeiro (Brazil)

- Publication Date:

- OSTI Identifier:
- 22494323

- Resource Type:
- Journal Article

- Journal Name:
- AIP Conference Proceedings

- Additional Journal Information:
- Journal Volume: 1693; Journal Issue: 1; Conference: 2. ICRANet Cesar Lattes meeting on supernovae, neutron stars and black holes, Rio de Janeiro (Brazil), 13-22 Apr 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; APPROXIMATIONS; BROOKHAVEN RHIC; CERN LHC; DIAGRAMS; ENERGY-MOMENTUM TENSOR; HADRONS; HEAVY ION REACTIONS; MASS; MATHEMATICAL SOLUTIONS; NUCLEAR MATTER; QUARK MATTER; RELATIVISTIC RANGE; SPACE-TIME; STRONG INTERACTIONS; UNIVERSE; WALECKA MODEL

### Citation Formats

```
Barros, Celso de Camargo, E-mail: barros.celso@ufsc.br, and Cunha, Ivan Eugênio da, E-mail: lordlihige@hotmail.com.
```*Nuclear matter in the early universe*. United States: N. p., 2015.
Web. doi:10.1063/1.4937199.

```
Barros, Celso de Camargo, E-mail: barros.celso@ufsc.br, & Cunha, Ivan Eugênio da, E-mail: lordlihige@hotmail.com.
```*Nuclear matter in the early universe*. United States. doi:10.1063/1.4937199.

```
Barros, Celso de Camargo, E-mail: barros.celso@ufsc.br, and Cunha, Ivan Eugênio da, E-mail: lordlihige@hotmail.com. Thu .
"Nuclear matter in the early universe". United States. doi:10.1063/1.4937199.
```

```
@article{osti_22494323,
```

title = {Nuclear matter in the early universe},

author = {Barros, Celso de Camargo, E-mail: barros.celso@ufsc.br and Cunha, Ivan Eugênio da, E-mail: lordlihige@hotmail.com},

abstractNote = {Recently, extreme conditions have been obtained in ultra-relativistic heavy ion collisions at RHIC and at the Large Hadron collider. It is believed that these conditions are similar to the ones of the early Universe, in the time between 10{sup −6}s and 1s, approximately. In this work, the hadrons produced in this range of time will be studied, considering some aspects of the systems produced in the heavy-ion collisions. We will study a phase posterior to the phase transition (in fact it is believed to be a crossover) from the quark-gluon plasma, that is the hadronic phase of the Universe. We will show the model proposed in [1], considering the hadronic matter described by a relativistic model (similar to the Walecka model), considering particles described by quantum equations in a curved spacetime. This curvature is due to the mass and to the strong interactions that appears in the energy-momentum tensor. The set of the equations is proposed in the Robertson-Walker metric, and some approximate solutions are obtained.},

doi = {10.1063/1.4937199},

journal = {AIP Conference Proceedings},

issn = {0094-243X},

number = 1,

volume = 1693,

place = {United States},

year = {2015},

month = {12}

}