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

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

Fotios K. Anagnostopoulos
(
- Peloponnese U.
)
,
Alfio Bonanno
(
- INAF, Catania and
- INFN, Catania
)
,
Ayan Mitra
(
)
,
Vasilios Zarikas
(
- Nazarbayev U., Astana and
- Thessaly U.
)

Jan 6, 2022

15 pages

Published in:

Phys.Rev.D 105 (2022) 8, 083532

Published: Apr 15, 2022

e-Print:

2201.02251 [gr-qc]

DOI:

10.1103/PhysRevD.105.083532 (publication)

View in:

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Abstract: (APS)

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

Λ CDM

cosmology while one of them has no fine-tuning problem. We also show that our model satisfies the observational local constraints on

\dot{G} / G

.

Note:

15 pages, 3 figures

gravitation: fundamental constant
space-time: expansion
expansion: acceleration
fixed point: infrared
cosmological model: parameter space
cosmological constant
scaling
dark matter
dark energy
deceleration

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