All Questions
7
questions
0
votes
1
answer
93
views
Event after big bang that cause dark matter [closed]
When the universe was formed by the Big Bang, what was the event that made some matter visible to us, while some became dark matter?
1
vote
1
answer
178
views
How the dark matter density parameter appears in Big Bang Nucleosynthesis (BBN)?
I know that it is possible to obtain the light element abundances ($^{4}\mathrm{He}, \mathrm D, ^{7}\mathrm{Li}$ etc.) and to determine the baryon-to-photon ratio $\eta$ from the total baryon ...
3
votes
2
answers
3k
views
Do we need dark matter and dark energy, if the behaviour of the universe in its initial stages was similar to that of the Sun? [closed]
According to CMBR the universe was a cloud of plasma and was a perfect black body, $380,\!000$ years after big bang.
But the Sun in our solar system also is in the state of plasma, thus making it a ...
6
votes
1
answer
171
views
Do galaxies have a halo of neutrinos and cosmic microwave background?
If virial arguments as in "How can dark matter collapse without collisions or radiation?" allow concluding that dark matter could collapse to galactic halos purely gravitationally, then is this true ...
- 1,289
4
votes
1
answer
2k
views
What is the difference between the Big Bang Model and the Λ-CDM Model?
If I'm going to write about "The Consensus Model of Cosmology" should I include Big Bang Model or should I go with just the $\Lambda$-CDM Model?
4
votes
4
answers
311
views
Is it possible that dark-matter is composed of a large number of neutrinos from the big bang? [duplicate]
They seem to have all the properties of dark-matter (massive, with no electromagnetic interaction). Could it be that many of the neutrinos produced since the big bang have formed massive neutrino ...
- 129
4
votes
3
answers
235
views
Proportion of dark matter/energy to other matters/energy at the beginning of the universe?
What was the proportion of dark matter/energy to other matters/energy at the moments after the beginning of the universe (standard Big Bang model)?
- 229