Varying Constants Entropic-ΛCDM Cosmology
We formulate the basic framework of thermodynamical entropic force cosmology which allows variation of the gravitational constant G and the speed of light c. Three different approaches to the formulation of the field equations are presented. Some cosmological solutions for each framework are given a...
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doaj-c92a7b7e82b243458fd78cee028100f92020-11-25T00:11:57ZengMDPI AGEntropy1099-43002016-02-011826010.3390/e18020060e18020060Varying Constants Entropic-ΛCDM CosmologyMariusz P. Da̧browski0Hussain Gohar1Vincenzo Salzano2Institute of Physics, University of Szczecin, Wielkopolska 15, 70-451 Szczecin, PolandInstitute of Physics, University of Szczecin, Wielkopolska 15, 70-451 Szczecin, PolandInstitute of Physics, University of Szczecin, Wielkopolska 15, 70-451 Szczecin, PolandWe formulate the basic framework of thermodynamical entropic force cosmology which allows variation of the gravitational constant G and the speed of light c. Three different approaches to the formulation of the field equations are presented. Some cosmological solutions for each framework are given and one of them is tested against combined observational data (supernovae, BAO, and CMB). From the fit of the data, it is found that the Hawking temperature numerical coefficient γ is two to four orders of magnitude less than usually assumed on the geometrical ground theoretical value of O(1) and that it is also compatible with zero. In addition, in the entropic scenario, we observationally test that the fit of the data is allowed for the speed of light c growing and the gravitational constant G diminishing during the evolution of the universe. We also obtain a bound on the variation of c to be Δc / c ∝ 10-5 > 0 , which is at least one order of magnitude weaker than the quasar spectra observational bound.http://www.mdpi.com/1099-4300/18/2/60varying constantsentropic forcegravitational thermodynamics |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Mariusz P. Da̧browski Hussain Gohar Vincenzo Salzano |
spellingShingle |
Mariusz P. Da̧browski Hussain Gohar Vincenzo Salzano Varying Constants Entropic-ΛCDM Cosmology Entropy varying constants entropic force gravitational thermodynamics |
author_facet |
Mariusz P. Da̧browski Hussain Gohar Vincenzo Salzano |
author_sort |
Mariusz P. Da̧browski |
title |
Varying Constants Entropic-ΛCDM Cosmology |
title_short |
Varying Constants Entropic-ΛCDM Cosmology |
title_full |
Varying Constants Entropic-ΛCDM Cosmology |
title_fullStr |
Varying Constants Entropic-ΛCDM Cosmology |
title_full_unstemmed |
Varying Constants Entropic-ΛCDM Cosmology |
title_sort |
varying constants entropic-λcdm cosmology |
publisher |
MDPI AG |
series |
Entropy |
issn |
1099-4300 |
publishDate |
2016-02-01 |
description |
We formulate the basic framework of thermodynamical entropic force cosmology which allows variation of the gravitational constant G and the speed of light c. Three different approaches to the formulation of the field equations are presented. Some cosmological solutions for each framework are given and one of them is tested against combined observational data (supernovae, BAO, and CMB). From the fit of the data, it is found that the Hawking temperature numerical coefficient γ is two to four orders of magnitude less than usually assumed on the geometrical ground theoretical value of O(1) and that it is also compatible with zero. In addition, in the entropic scenario, we observationally test that the fit of the data is allowed for the speed of light c growing and the gravitational constant G diminishing during the evolution of the universe. We also obtain a bound on the variation of c to be Δc / c ∝ 10-5 > 0 , which is at least one order of magnitude weaker than the quasar spectra observational bound. |
topic |
varying constants entropic force gravitational thermodynamics |
url |
http://www.mdpi.com/1099-4300/18/2/60 |
work_keys_str_mv |
AT mariuszpdabrowski varyingconstantsentropiclcdmcosmology AT hussaingohar varyingconstantsentropiclcdmcosmology AT vincenzosalzano varyingconstantsentropiclcdmcosmology |
_version_ |
1725402150700318720 |