All Questions
4
questions
2
votes
1
answer
133
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How is the primordial abundance of Lithium measured?
I was reading about the "Lithium problem" and I came across this Physics SE post: Discrepancy problem in lithium?
The answer mentioned
On the other hand, measurements of the $\rm Li$ abundance ...
user191954
1
vote
0
answers
125
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Fisher Forecasting For EUCLID Experiment Help [closed]
I'm trying to recreate the results of this paper https://arxiv.org/abs/1607.08016
to obtain the constraints for the matter density and hubble constant h.
However every time I try to create there ...
- 179
2
votes
0
answers
59
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Any method to determine the gravitational constant $G$ from observations in cosmological scale?
By the observations in cosmological scale, I mean observations by astrophysicists like motions of quasars in far distance from us, relative motions of our galaxy to others, etc.
I know the famous ...
- 189
3
votes
1
answer
133
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How was hydrogen gas (H) obtained by spectroscopists? Why is there more H than H2 in space?
Introductory quantum mechanics lessons talk about emission and absorption spectra for the hydrogen gas, and then give you an explanation as if this gas were pure $H$ atoms, and not the $H_2$ molecule (...
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