Vector-field model with compensated cosmological constant and radiation-dominated FRW phase

Abstract

A special model of a massless vector-field is presented, which has an extra modified-gravity-type interaction term in the action. The cosmology of the model is studied with standard noninteracting relativistic matter added. It is found that this cosmology can have an early phase where the vector-field starts to compensate a (Planck-scale) cosmological constant and a late Friedmann-Robertson-Walker (FRW) phase where the relativistic-matter energy density dominates the dynamic vacuum energy density.

12 pages, v5: published version (but with a small change in the Note Added)

References in corpus (3)

• Self-tuning vacuum variable and cosmological constant
• Dynamic vacuum variable and equilibrium approach in cosmology
• Effective cosmological constant from TeV-scale physics: Simple field-theoretic model

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• Constraints on interacting dark energy revisited: implications for the Hubble tension
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• The Newton constant and gravitational waves in some vector field adjusting mechanisms
• Robustness of the Cosmological Constant Damping Mechanism Through Matter Eras
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