We use the Lewis and Riesenfeld invariant method to obtain the exact Schrödinger wave
functions for a time-dependent harmonic oscillator with and without an inverse quadratic …

In this work, we use linear invariants and the dynamical invariant method to obtain exact
solutions of the Schrödinger equation for the generalized time-dependent forced harmonic …

In this work we study scalar fields in a Friedmann-Robertson-Walker space-time. We use the
invariant operator formulation of Lewis and Riesenfeld in order to study the behavior of …

In this contribution we use linear invariants and the dynamical invariant method in the
framework of the linear Schrödinger equation to study scalar fields in a Friedman–Robertson …

We used dynamical invariant operator method to find the quantum mechanical solution of a
harmonic plus inverse harmonic oscillator with time-dependent coefficients. The eigenvalue …

In this work, we investigate the quantum effects of relic gravitons from a Schrödinger-picture
point of view. By considering the gravity-wave equations in the Friedmann–Robertson …

The Wheeler-DeWitt equation for empty FRW minisuperspace universes of Hartle-Hawking
factor ordering parameter Q= 0 is mapped onto the dynamics of a unit mass classical …

In this work, we study quantum effects of a massive scalar field in the de Sitter spacetime.
We reduce the problem to that of a time-dependent harmonic oscillator and use exact linear …

In this paper, we use the Coulomb gauge, linear invariants and the dynamical invariant
method in the framework of the Schrödinger equation to obtain a quantum description of …

In this study, we have investigated the time evolution of the first kind Lane–Emden-type
Kanai–Caldirola oscillator. The total energy of the one dimensional classical harmonic …