---
title: "Exact Cosmological Solutions of Einstein Maxwell Equations as Perturbations of the Bertottu-Robinson Model • CBPF Index"
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**Nota de Física****Publicado**

# **Exact Cosmological Solutions of Einstein Maxwell Equations as Perturbations of the Bertottu-Robinson Model**

**R. Portugal; Ivano Damião Soares**

1985

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## **Datos de la publicación**

<dl>

<dt>Autores</dt>
<dd>R. Portugal; Ivano Damião Soares</dd>

<dt>Tipo</dt>
<dd>Nota de Física</dd>

<dt>Estado</dt>
<dd>Publicado</dd>

<dt>Fecha de publicación</dt>
<dd>1985</dd>

<dt>Descripción</dt>
<dd>Two new classes of spatially homogeneous cosmological solutions of Einstein-Maxwell equations are obtained by considering a class of exact perturbations of the static Bertotti-Robinson (BR) model. The BR solution is shown to be unstable under these perturbations, being perturbed into exact cosmological solutions with perfect fluid (equations of state &lt;math&gt; p= \lambda \rho , 0 \le \lambda \le 1 \,\! &lt;/math&gt; ) isotropic/anisotropic expansion and non null, electric conductivity.</dd>

<dt>Año</dt>
<dd>1985</dd>

<dt>Número</dt>
<dd>CBPF-NF-017/85</dd>

<dt>Vínculo con tesis</dt>
<dd>No</dd>

<dt>Vínculo con beca</dt>
<dd>No</dd>

</dl>

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