I Cosmology: Compton Drag Explained

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    Cosmology Drag
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Compton Drag in cosmology refers to the interaction between photons and matter, affecting the motion of cosmic structures. Participants are encouraged to share relevant reading materials and specific questions to facilitate a deeper understanding. The discussion is aimed at an undergraduate level, as indicated by the thread's "I" prefix. Clarifying educational background helps tailor the conversation to the appropriate complexity. Engaging with these elements will enhance the exploration of Compton Drag and its implications in cosmology.
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What is the Compton Drag in cosmology?
What is the Compton Drag in cosmology?
 
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Welcome to PF.

Can you post links to the reading you've been doing on this so far, and ask specific questions about that reading? Also, please give us an idea of your educational background -- you've marked this thread with an "I" prefix, which means that you'd like the discussion to be at the level of undergraduate university. Is that what you intended?
 

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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