Theory of stress and strain fields in general relativity and cosmological expansion
Théorie des champs des contraintes et déformations en relativité générale et expansion cosmologique.
Résumé
In this article we propose to add stress-energy tensor to the Einstein equations, assuming that the matter-energy and the metric space-time is nothing but a continuous medium with some elastic properties. We first give a general expression of the stress tensor which is linearly related to the strain tensor. Then, we give the particular expression of the stress tensor for a spatially homnogeneous and isotropic cosmological medium. After that we derive the modified Friedmann equations. In first approximation, we end up with the usual term $\Lambda g_{\mu\nu}$ , where the cosmological constant $\Lambda=K\varepsilon$ is related with the bulk modulus K and the relative variation of volume (dilatation). Then we derive corrections to the standard model in second approximation, which depend on these two new parameters.
Fichier principal
TheorieChampDeformationRG_MathieuBeau_version2.pdf (174.45 Ko)
Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...