A 5D non compact and non Ricci flat Kaluza-Klein Cosmology
F. Darabi
TL;DR
This paper proposes a 5D noncompact, non Ricci flat Kaluza-Klein cosmological model where the 4D universe interacts with a scalar field and dark pressure, showing that certain scalar field states do not induce inflation or acceleration.
Contribution
It introduces a novel 5D cosmological model with non Ricci flatness and explores the effects of scalar fields and dark pressure on universe dynamics.
Findings
Neither early inflation nor current acceleration occurs with non-vacuum scalar field states.
The model couples 4D Robertson-Walker metric to perfect fluid and extra-dimensional scalar field.
The non Ricci flat 5D framework provides new insights into universe evolution.
Abstract
A model universe is proposed in the framework of 5-dimensional noncompact Kaluza-Klein cosmology which is not Ricci flat. The 4D part as the Robertson-Walker metric is coupled to conventional perfect fluid, and its extra-dimensional part is coupled to a dark pressure through a scalar field. It is shown that neither early inflation nor current acceleration of the 4D universe would happen if the non-vacuum states of the scalar field would contribute to 4D cosmology.
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