Dark Matter & Dark Energy: Unfound Cosmological Science

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Cosmology relies heavily on the concepts of dark matter and dark energy, which are not directly detectable but are inferred from their gravitational effects. The term "dark" refers to the lack of emitted electromagnetic radiation, not to the idea that these components are unfound. Currently, the mainstream model indicates that most of the universe's energy density is dark. There is speculation that a modified theory of gravity could account for dark energy, potentially simplifying the cosmological model. However, no alternative theory has yet proven superior to the existing framework.
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That is what cosmology teaches us, dark matter, dark energy everything cosmological depends on unfound science?
 
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wolram said:
That is what cosmology teaches us, dark matter, dark energy everything cosmological depends on unfound science?

Dark does not mean "unfound". In this context, it means that it doesn't emit a detectable amount of electromagnetic radiation. And yes, the majority of the energy density of the universe is "dark" in the mainstream model. It is certainly plausible that a modified theory of gravity could explain the apparent dark energy, eliminating the largest dark component, but no model has yet distinguished itself.
 

Thread 'Matter density right after the decoupling'

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##.
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Thread 'Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".'

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...
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Thread 'Big Bang and Infinite Universe'

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...
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