Quantum Fluctuations in the Effective Relational GFT Cosmology

Marchetti, Luca und Oriti, Daniele (26. Juli 2021): Quantum Fluctuations in the Effective Relational GFT Cosmology. In: Frontiers in Astronomy and Space Sciences, Bd. 8, 683649

Abstract

We analyze the size and evolution of quantum fluctuations of cosmologically relevant geometric observables, in the context of the effective relational cosmological dynamics of GFT models of quantum gravity. We consider the fluctuations of the matter clock observables, to test the validity of the relational evolution picture itself. Next, we compute quantum fluctuations of the universe volume and of other operators characterizing its evolution (number operator for the fundamental GFT quanta, effective Hamiltonian and scalar field momentum). In particular, we focus on the late (clock) time regime, where the dynamics is compatible with a flat FRW universe, and on the very early phase near the quantum bounce produced by the fundamental quantum gravity dynamics.

• Dokumententyp: Zeitschriftenartikel
• Keywords: Quantum gravity; cosmology: theory; loop quantum cosmology; group field theory; emergent spacetime; relational dynamics
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2296-987X
• Sprache: Englisch