ATTENZIONE!!! IL SISTEMA E' UTILIZZABILE ESCLUSIVAMENTE IN MODALITA' "CONSULTAZIONE". CAUSA PROBLEMI TECNICI, SI PREGA DI NON EFFETTUARE L'AUTENTICAZIONE, FINO A NUOVA COMUNICAZIONE. GRAZIE
 

Bouncing and emergent cosmologies from Arnowitt-Deser-Misner RG flows

Journal
Date Issued
2018
Author(s)
•
Gionti, S. J. Gabriele
•
Platania, Alessia
DOI
Abstract
Asymptotically safe gravity provides a framework for the description of gravity from the trans-Planckian regime to cosmological scales. According to this scenario, the cosmological constant and Newton’s coupling are functions of the energy scale whose evolution is dictated by the renormalization group (RG) equations. The formulation of the RG equations on foliated spacetimes, based on the Arnowitt-Deser-Misner (ADM) formalism, furnishes a natural way to construct the RG energy scale from the spectrum of the Laplacian operator on the spatial slices. Combining this idea with an RG improvement procedure, in this work we study quantum gravitational corrections to the Einstein-Hilbert action on Friedmann-Lemaître-Robertson-Walker backgrounds. The resulting quantum-corrected Friedmann equations can give rise to both bouncing cosmologies and emergent Universe solutions. Our bouncing models do not require the presence of exotic matter and emergent Universe solutions can be constructed for any allowed topology of the spatial slices.
Volume
35
Issue
6
Start page
065004
Uri
Url
Issn Identifier
0264-9381
Ads BibCode
2018CQGra..35f5004B
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

OA4.pdf

Description
[Administrators only]
Size

1.01 MB

Format

Adobe PDF

Checksum (MD5)

44ce9d895f257fb3f703c8d65b0401e6

Loading...
Thumbnail Image
Name

CQG preprint 1710.06317.pdf

Description
preprint
Size

376.17 KB

Format

Adobe PDF

Checksum (MD5)

0564aa4ff0b5ae3290166b767964086d