Why is Dark Matter essential for understanding the universe?

AI Thread Summary
Dark Matter is essential for understanding the universe due to its role in explaining gravitational effects that cannot be accounted for by visible matter. Observations such as galaxy rotation curves, gravitational lensing, and the cosmic microwave background radiation all indicate the presence of Dark Matter. It is believed that Dark Matter is not baryonic because baryonic matter would emit detectable radiation, which is not observed. Current theories suggest that Dark Matter could be composed of weakly interacting massive particles (WIMPs) or other exotic particles. Engaging with these concepts is crucial for a deeper understanding of cosmic phenomena.
bolahab
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Why do we think there is a significant amount of Dark Matter in the
universe?
a) Descibe at least 3 independent situations which require Dark Matter to understand observations.
b) Why don’t we think that Dark Matter is baryonic?
c) What do we think is might be?
 
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We respectfully request students to apply some effort and attempt an answer first, and show work before asking for assistance.
 
Yeah for this question i did a lot of work on it, but I am trying to see what i got is right, and if does match what i get from you guys
 
I think he wants you to show us your answers first, and we can tell you were you went wrong, otherwise, you are getting the smarter kid to do your homework.
 
Thread 'Help with Time-Independent Perturbation Theory "Good" States Proof'

Thread 'Help with Time-Independent Perturbation Theory "Good" States Proof'

(Disclaimer: this is not a HW question. I am self-studying, and this felt like the type of question I've seen in this forum. If there is somewhere better for me to share this doubt, please let me know and I'll transfer it right away.) I am currently reviewing Chapter 7 of Introduction to QM by Griffiths. I have been stuck for an hour or so trying to understand the last paragraph of this proof (pls check the attached file). It claims that we can express Ψ_{γ}(0) as a linear combination of...
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