Perturbation, non-Gaussianity, and reheating in a Gauss-Bonnet -attractor model

K Nozari, N Rashidi - Physical Review D, 2017 - APS
Motivated by α-attractor models, in this paper we consider a Gauss-Bonnet inflation with an
E-model-type of potential. We consider the Gauss-Bonnet coupling function to be the same …

Gauss–Bonnet Inflation after Planck2018

N Rashidi, K Nozari - The Astrophysical Journal, 2020 - iopscience.iop.org
We study the primordial perturbations and reheating process in the models where the Gauss–
Bonnet (GB) term is nonminimally coupled to the canonical and noncanonical (DBI and …

Slow-roll inflation in f (R, T) gravity with a RT mixing term

CY Chen, Y Reyimuaji, X Zhang - Physics of the Dark Universe, 2022 - Elsevier
We consider slow-roll inflationary models in a class of modified theories of gravity which
contains non-minimal curvature–inflaton couplings, ie, the f (R, T) gravity, where R is the …

Observational Viability of an Inflation Model with E-model Nonminimal Derivative Coupling

K Nozari, N Rashidi - The Astrophysical Journal, 2018 - iopscience.iop.org
By starting with a two-fields model in which the fields and their derivatives are nonminimally
coupled to gravity, and then by using a conformal gauge, we obtain a model in which the …

Large non-gaussianity in a non-minimally coupled derivative inflationary model with Gauss-Bonnet correction

K Nozari, N Rashidi - Physical Review D, 2016 - APS
We study a nonminimal derivative inflationary model in the presence of the Gauss-Bonnet
term. To have a complete treatment of the model, we consider a general form of the …

Tachyon mimetic inflation as an instabilities-free model

N Rashidi, K Nozari - Physical Review D, 2020 - APS
We consider the mimetic tachyon model in the Lagrange multiplier approach. We study both
the linear and nonlinear perturbations and find the perturbation and non-Gaussianity …

Stability of non-minimally coupled dark energy in the geometrical trinity of gravity

Y Carloni, O Luongo - arXiv preprint arXiv:2410.10935, 2024 - arxiv.org
Within the geometrical trinity of gravity, we analyze scalar field dark energy models
minimally and non-minimally coupled to gravity, postulating that a Yukawa-like interacting …

Adiabatic regularization of power spectra in nonminimally coupled chaotic inflation

AL Alinea - Journal of Cosmology and Astroparticle Physics, 2016 - iopscience.iop.org
We investigate the effect of adiabatic regularization on both the tensor-and scalar-
perturbation power spectra in nonminimally coupled chaotic inflation. Similar to that of the …

[HTML][HTML] Viable intermediate inflation in the mimetic DBI model

N Rashidi, K Nozari - The European Physical Journal C, 2021 - Springer
We study the intermediate inflation in the mimetic Dirac–Born–Infeld model. By considering
the scale factor as\(a= a_ {0}\exp (bt^{\beta})\), we show that in some ranges of the …

Late time cosmological dynamics with a nonminimal extension of the mimetic matter scenario

N Hosseinkhan, K Nozari - The European Physical Journal Plus, 2018 - Springer
We investigate an extension of mimetic gravity in which mimetic matter is nonminimally
coupled to the Ricci scalar. We derive the background field equations and show that, as the …