δ Gravity, δ Matter and the Accelerated Expansion of the Universe
- Авторы: Alfaro J.1, González P.2
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Учреждения:
- Facultad de Física
- Sede Esmeralda
- Выпуск: Том 25, № 3 (2019)
- Страницы: 259-267
- Раздел: Article
- URL: https://journals.rcsi.science/0202-2893/article/view/176352
- DOI: https://doi.org/10.1134/S0202289319030022
- ID: 176352
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Аннотация
Introducing an additional symmetry (δ symmetry) in the Einstein-Hilbert action, we obtain a gravitational field model (δ gravity) based on two symmetric tensors, gμv and ̃gμv where an effective metric, given by gμv = gμv + ̃gμv must be defined to describe the trajectories of massless particles. In previous papers, a truncated versions of δ gravity applied to cosmology was presented, where the δ symmetry was fixed in order to simplify the analysis of the model. The model predicts an accelerated expansion of the Universe without a cosmological constant or additional scalar fields, ending in a Big Rip. We present the full-fledged δ gravity, introducing a new kind of matter fields (δ matter) in order to preserve the δ symmetry. In this approach the prediction of the expansion of the Universe is preserved, but the value of the cosmological parameters improve greatly by the inclusion of δ matter. Additionally, δ matter gives us an excellent candidate for Dark Matter.
Об авторах
Jorge Alfaro
Facultad de Física
Автор, ответственный за переписку.
Email: jalfaro@uc.cl
Чили, Casilla 306, Santiago
Pablo González
Sede Esmeralda
Автор, ответственный за переписку.
Email: pgonzalezv@uta.cl
Чили, Avda. Luis Emilio Recabarren, Iquique, 2477