Swiss-cheese cosmologies with variable G and Λ from the renormalization group

Anagnostopoulos F.K. Bonanno A. Mitra A. Zarikas V.
15 April 2022 American Physical Society

Physical Review D
2022 #105 Issue 8

A convincing explanation for the nature of the dark energy and dark matter is still missing. In recent works a RG-improved swiss-cheese cosmology with an evolving cosmological constant dependent on the Schücking radius has been proven to be a promising model to explain the observed cosmic acceleration. In this work we extend this model to consider the combined scaling of the Newton constant G and the cosmological constant Λ according to the IR-fixed point hypothesis. We shall show that our model easily generates the observed recent passage from deceleration to acceleration without need of extra energy scales, exotic fields or fine-tuning. In order to check the generality of the concept, two different scaling relations have been analyzed and we proved that both are in very good agreement with ΛCDM cosmology while one of them has no fine-tuning problem. We also show that our model satisfies the observational local constraints on Ġ/G.

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Department of Informatics and Telecommunications, University of the Peloponnese, Karaiskaki 70, Tripoli, 221 00, Greece
INAF, Osservatorio Astrofisico di Catania, Via S.Sofia 78, Catania, 95123, Italy
INFN, Sezione di Catania, Via S. Sofia 72, Catania, 95123, Italy
The Inter-University Centre for Astronomy and Astrophysics (IUCAA), Post Bag 4, Ganeshkhind, Pune, 411007, India
Nazarbayev University, School of Engineering, 010000, Kazakhstan
Kazakh-British Technical University, Tole bi 59, Almaty, 050000, Kazakhstan
University of Thessaly, Department of Mathematics, Lamia, 35100, Greece

Department of Informatics and Telecommunications
INAF
INFN
The Inter-University Centre for Astronomy and Astrophysics (IUCAA)
Nazarbayev University
Kazakh-British Technical University
University of Thessaly

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