Since Verlinde's proposal that gravitation is related to entropy, there have been many papers discussing or extending his hypothesis. In a recent paper, Basilakos and Sola reconsidered entropic-force dark energy (http://arxiv.org/pdf/1402.6594v3.pdf). They wrote: "We reconsider the entropic-force model in which both kind of Hubble terms appear in the effective dark energy (DE) density affecting the evolution of the main cosmological functions, namely the scale factor, deceleration parameter, matter density and growth of linear matter perturbations. However, we find that the entropic-force model is not viable at the background and perturbation levels due to the fact that the entropic formulation does not add a constant term in the Friedmann equations."
So do you think that entropic force can explain dark energy?
I will carefully read this paper of Basilakos and Sola. As a first thought it seems to me that Verlinde´s ideas may explain gravitation, an atractive force. I fail to see right now how the same ideas may explain an obvious expanding force, as dark energy implies. Where does the physical mechanism changes sign and why?
I have read the paper. The authors recognize that the deceleration parameter maintains sign throughout the cosmic history. Then the universe always accelerates or always decelerates. As stated by them this feature is the main drawback of this model. Besides all the efforts to solve this conundrum seem to me ad hoc efforts to arrive nowhere. The answer to the question: Can entropic force explain dark energy properly? Based on this paper the answer is no.
Dear Antonio, thank you for your answer. For your information, since 2010 there were many papers discussing entropic dark energy, including by Smoot et al. The file that i attached is one of the most recent papers. Best wishes
Why did the wrong "entropy" appear ?
In summary , this was due to the following two reasons:
1) Physically, people didn't know Q=f(P, V, T).
2) Mathematically, people didn't know AΔB couldn‘t become AdB directely .
If people knew any one of them, the mistake of entropy would not happen in history.
Please read my paper and those answers of the questions related to my paper in my Projects.
https://www.researchgate.net/publication/230554936_Entropy_A_concept_that_is_not_a_physical_quantity
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