Jun 12 – 16, 2023
Asia/Yerevan timezone

Quantum-gravitational corrections to the power spectrum for a closed universe

Jun 15, 2023, 4:00 PM
15m

Speaker

Ms Tatevik Vardanyan (Institute for Theoretical Physics, University of Cologne)

Description

We study the quantum-gravitational corrections to the power spectrum of a gauge-invariant inflationary scalar perturbations in a closed model of a universe. We consider canonical quantum gravity as an approach to quantizing gravity. This leads to the Wheeler-DeWitt equation, which has been studied by applying a semiclassical Born–Oppenheimer type of approximation. At the corresponding orders of approximation, we recover both the uncorrected and quantum-gravitationally corrected Schrödinger equations for the perturbation modes from which we calculate the quantum-gravitational corrections to the power spectrum in the slow-roll regime. The results are compared to the power spectra for the flat model of the universe.

Primary authors

Ms Tatevik Vardanyan (Institute for Theoretical Physics, University of Cologne) Prof. Claus Kiefer (Institute for Theoretical Physics, University of Cologne)

Presentation materials

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