Inflationary Cosmology with a scalarcurvature mixing term $\frac{1}{2} \xi R \phi^2$
 Date
 December 20 (Wed) at 16:00  17:30, 2023 (JST)
 Speaker

 Payel Sarkar (Visiting Researcher, Kyoto University)
 Language
 English
 Host
 CheYu Chen
We use the PLANCK 2018 and the WMAP data to constraint inflation models driven by a scalar field $\phi$ in the presence of the nonminimal scalarcurvature mixing term $\frac{1}{2}\xi R \phi^2$. We consider four distinct scalar field potentials $\phi^p e^{\lambda\phi},~(1  \phi^{p})e^{\lambda\phi},~(1\lambda\phi)^p$ and $\frac{\alpha\phi^2}{1+\alpha\phi^2}$ to study inflation in the nonminimal gravity theory. We calculate the potential slowroll parameters, predict the scalar spectral index $n_s$, tensortoscalar ratio $r$, leading and higher order nonGaussianity parameters ($f_{NL},~\tau_{NL}$ and $g_{NL}$) and the amplitude of the scalar spectrum $A_s$ in the parameter ($\lambda, p, \alpha$) space of the potentials corresponding to different values of the nonminimal coupling parameter $\xi$. We have compared our results with the ones existing in the literature, and this indicates the present status of nonminimal inflation after the release of the PLANCK 2018 data.
Reference
 Payel Sarkar, Ashmita, Prasanta Kumar Das, Inflationary Cosmology with a scalarcurvature mixing term $\frac{1}{2} \xi R \phi^2$, Annals Phys. 454 (2023) 169340 (2023), doi: 10.1016/j.aop.2023.169340, arXiv: 2205.05532
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