53 research outputs found
Integrable cosmological models with non-minimal coupling and bounce solutions
We remind the way to obtain integrable models with non-minimally coupled
scalar fields. We are interesting to models with bounce solutions and compare
bounce solutions in two known integrable models. We show that only one model
has a bounce solution that tends to a stable de Sitter solution.Comment: 9 pages, 1 figure, in the proceedings of the 19th International
Seminar on High Energy Physics "Quarks-2016
Darboux Transformation of the Green Function for the Dirac Equation with the Generalized Potential
We consider the Darboux transformation of the Green functions of the regular
boundary problem of the one-dimensional stationary Dirac equation. We obtained
the Green functions of the transformed Dirac equation with the initial regular
boundary conditions. We also construct the formula for the unabridged trace of
the difference of the transformed and the initial Green functions of the
regular boundary problem of the one-dimensional stationary Dirac equation. We
illustrate our findings by the consideration of the Darboux transformation for
the Green function of the free particle Dirac equation on an interval.Comment: 14 pages,zip. file: Latex, 1 figure. Typos corrected, the figure
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gravity inflationary model with term
The proposed inflationary model, which is a one-parametric generalization of
the Starobinsky model, includes the term, where
the parameter is the inflaton mass, defined in the same way as in the
Starobinsky model, and is a dimensionless constant. Using the conformal
transformation and the Einstein frame potential, we obtain the inflationary
parameters of the model proposed. The value of the tensor-to-scalar ratio
is bigger than in the Starobinsky model. The considered inflationary model
produces a good fit to current observation data.Comment: 11 pages, 2 figure
Construction of inflationary scenarios with the Gauss-Bonnet term and nonminimal coupling
Inflationary models with a scalar field nonminimally coupled both with the
Ricci scalar and with the Gauss-Bonnet term are studied. We propose the way of
generalization of inflationary scenarios with the Gauss-Bonnet term and a
scalar field minimally coupled with the Ricci scalar to the corresponding
scenarios with a scalar field nonminimally coupled with the Ricci scalar. Using
the effective potential, we construct a set of models with the same values of
the scalar spectral index and the amplitude of the scalar perturbations
and different values of the tensor-to-scalar ratio .Comment: 11 pages, 5 figures, v2: minor corrections, references are added, to
appear in EPJ
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