A darkless space-time
| dc.creator | Tartaglia, A. | |
| dc.creator | Capone, M. | |
| dc.date | 2006-01-09 | |
| dc.date | 2007-04-25 | |
| dc.date.accessioned | 2026-07-07T11:26:21Z | |
| dc.date.available | 2026-07-07T11:26:21Z | |
| dc.description | In cosmology it has become usual to introduce new entities as dark matter and dark energy in order to explain otherwise unexplained observational facts. Here, we propose a different approach treating spacetime as a continuum endowed with properties similar to the ones of ordinary material continua, such as internal viscosity and strain distributions originated by defects in the texture. A Lagrangian modeled on the one valid for simple dissipative phenomena in fluids is built and used for empty spacetime. The internal "viscosity" is shown to correspond to a four-vector field. The vector field is shown to be connected with the displacement vector field induced by a point defect in a four-dimensional continuum. Using the known symmetry of the universe, assuming the vector field to be divergenceless and solving the corresponding Euler-Lagrange equation, we directly obtain inflation and a phase of accelerated expansion of spacetime. The only parameter in the theory is the "strength" of the defect. We show that it is possible to fix it in such a way to also quantitatively reproduce the acceleration of the universe. We have finally verified that the addition of ordinary matter does not change the general behaviour of the model. | |
| dc.description | 13 pages, 7 figures Typos; section V on Newtonian limit added | |
| dc.identifier | https://arxiv.org/abs/gr-qc/0601033 | |
| dc.identifier | http://arxiv.org/abs/gr-qc/0601033 | |
| dc.identifier | Int.J.Mod.Phys.D17:275-299,2008 | |
| dc.identifier | doi:10.1142/S0218271808012000 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/195795 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | A darkless space-time | |
| dc.type | text |