I What is the History of Dark Matter?

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The discussion highlights the historical evolution of dark matter's acceptance in cosmology, emphasizing that it is often oversimplified in accounts focusing on a few key scientists. The review by Gianfranco Bertone and Dan Hooper aims to provide a comprehensive perspective on the observational and theoretical developments that established dark matter as a crucial component of the standard cosmological model. Despite its significance, dark matter remains poorly understood, with no existing theories explaining its presence. Ongoing efforts include refining theoretical frameworks and conducting experiments to uncover its nature. The anticipation of new research, particularly by Erik Verlinde, suggests that further insights may soon emerge.
wolram
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I thought this may be interesting, the decades old search for Dark Mater.

arXiv:1605.04909 [pdf, other]
A History of Dark Matter
Gianfranco Bertone, Dan Hooper
Comments: 86 pages, 8 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Astrophysics of Galaxies (astro-ph.GA); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics - Phenomenology (hep-ph)

Although dark matter is a central element of modern cosmology, the history of how it became accepted as part of the dominant paradigm is often ignored or condensed into a brief anecdotical account focused around the work of a few pioneering scientists. The aim of this review is to provide the reader with a broader historical perspective on the observational discoveries and the theoretical arguments that led the scientific community to adopt dark matter as an essential part of the standard cosmological model.
 
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Likes haushofer, ShayanJ, DrSteve and 2 others
'Dark matter' is one of those placeholder names for a thing which measurably exists, but we don't know what it is.
No theory suggests it should be there, but it does.
Either we need to improve our theories, or else do experiments to find out what is going on.
Work is in progress in both ways as as far as I know
 
Personally, I'm curious about this 'about to come out'-new paper by Erik Verlinde.
 
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...

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