Work

On the cutoff scale identification of FLRW cosmology in asymptotically safe gravity

Year: 2025

Type: article

Abstract: We examine Friedmann–Lemaître–Robertson–Walker cosmology, incorporating quantum gravitational corrections through the functional renormalisation group flow of the effective action for gravity. We solve the Einstein equation with quantum improved coupling perturbatively including the case with non-vanishing classical cosmological constant (CC) which was overlooked in the literatures. We discuss what is the suitable identification of the momentum cutoff k with time scale, and find that the choice of the Hubble parameter is suitable for vanishing CC but not so for non-vanishing CC. We suggest suitable identification in this case. The energy-scale dependent running coupling breaks the time translation symmetry and then introduces a new physical scale.

Source: Classical and Quantum Gravity

DOI: 10.1088/1361-6382/adcdba

Authors: Chiang-Mei Chen, Rituparna Mandal, Nobuyoshi Ohta

Institutions: National Central University, Osaka Metropolitan University, Kindai University

Language: English

Topic: Noncommutative and Quantum Gravity Theories

Subfield: Statistical and Nonlinear Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,325

Funders: National Science and Technology Council, Japan Society for the Promotion of Science