Undergrad Cosmology: Compton Drag Explained

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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?
 
I always thought it was odd that we know dark energy expands our universe, and that we know it has been increasing over time, yet no one ever expressed a "true" size of the universe (not "observable" universe, the ENTIRE universe) by just reversing the process of expansion based on our understanding of its rate through history, to the point where everything would've been in an extremely small region. The more I've looked into it recently, I've come to find that it is due to that "inflation"...

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