In a kinetic-inflation model with non-minimal derivative coupling, scalar, vector, and tensor perturbation modes all grow during the quasi-de Sitter phase, with vector modes growing like a^4.
Cosmology with non-minimal coupled gravity: inflation and perturbation analysis
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abstract
We study a scalar-tensor cosmological model where the Einstein tensor is non-minimally coupled to the free scalar field dynamics. Using FRW metric, we investigate the behavior of scale factor for vacuum, matter and dark energy dominated eras. Especially, we focus on the inflationary behavior at early universe. Moreover, we study the perturbation analysis of this model in order to confront the inflation under consideration with the observational results.
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gr-qc 1years
2026 1verdicts
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Cosmological perturbations in the theory of gravity with non-minimal derivative coupling. I. Modes of perturbations
In a kinetic-inflation model with non-minimal derivative coupling, scalar, vector, and tensor perturbation modes all grow during the quasi-de Sitter phase, with vector modes growing like a^4.