conformal algebra 1deparametrisation 1FLRW cosmology 1gauge symmetries 1minisuperspace 1physical symmetries 1
From the 1 of 3 linked papers with an AI index.
3 papers
gr-qc2026
Emergent scalar field dynamics in a cosmological spacetime from GFT quantum gravity
Roukaya Dekhil, Federico Greco, Stefano Liberati +1
We derive an effective scalar field theory for matter in group field theory condensate cosmology, starting from the fundamental quantum-gravity dynamics in a fully relational frame…
gr-qc2026
Gauge vs (hidden) physical symmetries of FLRW cosmologies
Andrea Calcinari, Adrià Delhom, Federico Greco +2
The paper analyses how gauge symmetries and hidden physical symmetries differ in flat FLRW cosmologies with multiple massless scalar fields, showing that conformal Killing vectors…
astro-ph.CO2025
Production of gravitational waves by inflationary transitions in aligned natural inflation
Federico Greco
The original axion natural inflation model predicts a tensor-to-scalar ratio exceeding experimental limits. Conversely, in aligned axion inflation, inflation can proceed along traj…