Unified Dark Energy and Dark Matter from Dynamical Spacetime Cosmology

Abstract

A model of unified dark matter and dark energy based on a Dynamical Spacetime Theory (DST) is studied. By introducing a Dynamical Spacetime vector field ${\chi }_{\mu }$, a conservation of an energy momentum tensor $T_{(\chi )}^{\mu \nu }$ emerges. The action allows for two different potentials, while one represents a dark energy. For constant potentials, the cosmological solution yields a non singular bouncing solutions that rapidly approaches the $\Lambda$CDM model. The Dynamical Time corresponds to the cosmic time as well. The theory fits with the late time expansion data of the Universe. With higher dimensions a mechanism for inflation and compactification appears, with exponential growth for some dimensions and exponential contraction of the others. By demanding that the Dynamical Spacetime vector field be a gradient of a scalar the DST becomes a theory with diffusive interacting, which asymptotically returns to the $\Lambda$CDM model as a stable point. These formulations lead to scenarios which address our understanding about the origin of the Universe.

PhD Thesis

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Cited by in corpus (2)

• Observational constraints on Starobinsky $f(R)$ cosmology from cosmic expansion and structure growth data
• Unified Dark Energy and Dark Matter from Dynamical Spacetime Cosmology