3 papers
astro-ph.CO2025
Slow-rolling down the curvature: a reassessment of the Planck constraints on inflation in a closed universe
Enrico Specogna, Tatevik Vardanyan, William Giarè +1
We revisit the Cosmic Microwave Background (CMB) constraints on the spatial curvature of the Universe, assessing how they change when the curvature parameter and the primordial inf…
gr-qc2025
Matter-antimatter asymmetry in a rotating universe: Dirac spinors in axisymmetric Bianchi IX cosmology
Tatevik Vardanyan
The standard CDM model, based on a highly symmetric FLRW geometry, successfully explains many observations but faces unresolved issues, motivating the exploration of alternative…
gr-qc2023
Quantum-gravitational corrections to the power spectrum for a closed universe
Tatevik Vardanyan, Claus Kiefer
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 q…