Shear and Vorticity in an Accelerating Brans-Dicke Lambda-Universe with Torsion
Marcelo Samuel Berman
TL;DR
This paper investigates accelerating cosmological models incorporating shear, vorticity, a scalar field, and torsion, revealing a no-hair result and connecting with Machian ideas in the context of Einstein-Cartan theory.
Contribution
It extends Brans-Dicke cosmology by including torsion and spin effects, providing new insights into the behavior of shear and vorticity in accelerating universes.
Findings
Shear and vorticity decay in accelerating models
A no-hair result for shear and vorticity
Links to Machian universe concepts
Abstract
We study accelerating Universes with power-law scale-factors. We include shear and vorticity, a cosmological "constant" term, and spin from torsion, as in Einstein-Cartan's theory when a scalar-field of Brans-Dicke type acts in the model. We find a "no-hair" result, for shear and vorticity; we also make contact with the alternative Machian picture of the Universe. Keywords: Cosmology; Einstein; Brans-Dicke; Cosmological term; Shear; Spin; Vorticity; Inflation; Einstein-Cartan; Torsion; Accelerating Universe
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Taxonomy
TopicsCosmology and Gravitation Theories · Solar and Space Plasma Dynamics