Can Mic Oscillations Replace Dark Energy in Cosmic Expansion Models?

AI Thread Summary
Mic oscillations may offer an alternative explanation for the universe's accelerating expansion, traditionally attributed to dark energy. A new model suggests that under low density conditions, matter can exhibit negative pressure, driving acceleration without the need for dark energy. This approach combines statistical mechanics with a modified equation of state, indicating that the universe could stabilize at a constant energy density lower than that of dark energy. Current supernova data cannot distinguish this model from the standard Lambda Cold Dark Matter (LCDM) model but may reveal deviations. The discussion raises the question of other potential substitutes for dark energy in cosmological models.
wolram
Gold Member
Dearly Missed
Messages
4,410
Reaction score
555
mic oscillations.
[45] arXiv:1111.0520 [pdf, ps, other]
One explanation for the acceleration of the universe's expansion
Dong-Biao Kang
Comments: 5 pages, 2 figures, 1 tables
Subjects: Cosmology and Extragalactic Astrophysics (astro-ph.CO)

We have observed the acceleration of the expansion of the universe. To explain this phenomenon, we usually introduce the dark energy (DE) which has a negative pressure or we need to modify the Einstein's equation to produce a term which is equivalent to the dark energy. Are there other possibilities? Combining our previous works of statistical mechanics of self-gravitating system with the derivation of van der waals equation, we propose a different matter's equation of state (EoS) in this paper. Then we find that if the matter's density is low enough, its pressure can be negative, which means that it is the matter that drives the expansion's acceleration. So here we will not need to add the DE to the universe. Our results also predict that the universe finally tends to be dominated by an approximate constant energy density, but its value can be smaller than DE. The data of Supernova can not differentiate our model from the standard model, but they may indicate some deviations from LCDM
 
Space news on Phys.org
How many more substitutes for dark energy do you know of? is there a (leading) one.
 
https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
Hi, I’m pretty new to cosmology and I’m trying to get my head around the Big Bang and the potential infinite extent of the universe as a whole. There’s lots of misleading info out there but this forum and a few others have helped me and I just wanted to check I have the right idea. The Big Bang was the creation of space and time. At this instant t=0 space was infinite in size but the scale factor was zero. I’m picturing it (hopefully correctly) like an excel spreadsheet with infinite...
Back
Top