In this review we focus on the main cosmological implications of the Group Field Theory approach, according to which an effective continuum macroscopic dynamics can be extracted from the underlying formalism for quantum gravity. Within this picture what counts is the collective behaviour of a large number of quanta of geometry. The resulting state is a condensate-like structure made of “pre-geometric” excitations of the Group Field Theory field over a no-space vacuum. Starting from the kinematics and dynamics, we offer an overview of the way in which Group Field Theory condensate cosmology treats solutions for the homogeneous and isotropic universe. These solutions including a bounce, share with other quantum cosmological approaches the resolution of the singularity characterizing general relativity. Contrary to what is usually done in quantum cosmology, in Group Field Theory cosmology no preliminary symmetry reduction is needed for this purpose. We conclude with a discussion of the limits and future perspectives of the Group Field Theory approach.

Cosmological implications of the hydrodynamical phase of group field theory / L. Gabbanelli, S. De Bianchi. - In: GENERAL RELATIVITY AND GRAVITATION. - ISSN 0001-7701. - 53:7(2021 Jul 01), pp. 66.1-66.36. [10.1007/s10714-021-02833-z]

Cosmological implications of the hydrodynamical phase of group field theory

S. De Bianchi
2021

Abstract

In this review we focus on the main cosmological implications of the Group Field Theory approach, according to which an effective continuum macroscopic dynamics can be extracted from the underlying formalism for quantum gravity. Within this picture what counts is the collective behaviour of a large number of quanta of geometry. The resulting state is a condensate-like structure made of “pre-geometric” excitations of the Group Field Theory field over a no-space vacuum. Starting from the kinematics and dynamics, we offer an overview of the way in which Group Field Theory condensate cosmology treats solutions for the homogeneous and isotropic universe. These solutions including a bounce, share with other quantum cosmological approaches the resolution of the singularity characterizing general relativity. Contrary to what is usually done in quantum cosmology, in Group Field Theory cosmology no preliminary symmetry reduction is needed for this purpose. We conclude with a discussion of the limits and future perspectives of the Group Field Theory approach.
Bose-Einstein condensates; Bouncing cosmologies; Group field theory
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
Paradoxes and Metaphors of Time in Early Universe(s) (PROTEUS)
Article (author)
File in questo prodotto:
File Dimensione Formato  
Cosmological implications_ARXIV.pdf

accesso aperto

Tipologia: Pre-print (manoscritto inviato all'editore)
Dimensione 419.39 kB
Formato Adobe PDF
419.39 kB Adobe PDF Visualizza/Apri
Gabbanelli-Bianchi2021_Article_CosmologicalImplicationsOfTheH.pdf

accesso riservato

Tipologia: Publisher's version/PDF
Dimensione 544.79 kB
Formato Adobe PDF
544.79 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/857825
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? 0
social impact