Vector field as a quintessence partner

Details Vector field as a quintessence partner Vector field as a quintessence partner

2004-02-23

arxiv.org/abs/gr-qc/0402095v4

Class.Quant.Grav. 21 (2004) 3323-3336

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, LaTeX file, iopart class, discussion extended, reference added

Scientific paper

10.1088/0264-9381/21/13/014

We derive generic equations for a vector field driving the evolution of flat homogeneous isotropic universe and give a comparison with a scalar filed dynamics in the cosmology. Two exact solutions are shown as examples, which can serve to describe an inflation and a slow falling down of dynamical ``cosmological constant'' like it is given by the scalar quintessence. An attractive feature of vector field description is a generation of ``induced mass'' proportional to a Hubble constant, which results in a dynamical suppression of actual cosmological constant during the evolution.

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