All Questions
18
questions
2
votes
0
answers
90
views
Gravitational halos made of neutrinos...?
I have been recently interested in how halos made of standard model particles could be formed and behave.
After asking some questions in this site, I was told about how neutrinos could form such halos....
- 2,462
0
votes
0
answers
31
views
Why can't Dark matter be made up mostly of Neutrinos? [duplicate]
It's said that Neutirnos can only make up a tiny fraciton of dark matter.
So why can't Dark matter be mostly made up of Neutrinos?
Why can't there just be a huge number of them?
I suspect myself that ...
- 2,908
3
votes
1
answer
75
views
How did neutrinos eliminated from dark matter? [duplicate]
I am reading "Dark Matter and Dark Energy" by Brian Clegg.
In Chapter 3 it's discussing about cosmic microwave background radiation and the elliptical shape
of early universe obtained from ...
1
vote
0
answers
45
views
Possibility of reaching equilibrium starting with a nonequilibrium initial condition in the early radiation-domination
Update after @knzhou's comment
If in a theory, the coupling of the dark matter (DM) field to the Standard Model (SM) fields is small enough, the rate of interaction of the DM particles in the ...
- 26.8k
0
votes
1
answer
242
views
Could cosmological cold dark matter be a neutrino condensate?
What is wrong with the following? (Note that the question is not about galactic dark matter, but about cosmological dark matter.)
Neutrinos are dark matter.
A neutrino condensate would be cold. (...
user85598
11
votes
2
answers
448
views
Cold neutrinos - how are they distributed?
Cold or slow neutrinos have non-relativistic velocities and hence very low energies. That makes them very difficult to detect. Answers to Where are all the slow neutrinos? make it clear that they are ...
- 7,438
3
votes
2
answers
232
views
Are ultra-cold neutrinos an option for cold dark matter? [duplicate]
Nobody hass seen cold dark matter. Are ultra-cold (non-relativistic) neutrinos, below 1 fK (femtokelvin), an option for dark matter?
This is a question about normal neutrinos - electron neutrinos and ...
user85598
10
votes
1
answer
442
views
Are neutrinos and sterile neutrinos both dark matter candidates?
Are both neutrinos and sterile neutrinos candidates for dark matter?
In particular, why would "standard" neutrinos be a candidate for dark matter, since they interact with matter?
Why would ...
0
votes
1
answer
51
views
How are neutrinos massless? Could they or at least some of their forms be a potential candidate for Dark matter? [duplicate]
I am particularly new to this subject. Can neutrino physics be understood by a 10th grade?
- 1
0
votes
1
answer
92
views
Sterile neutrinos findings
There is a relatively new paper https://arxiv.org/abs/1805.12028 of MiniBooNE on measurements of neutrino oscillations that can only be explained by the postulate of a sterile neutrino. I also read ...
- 9,778
2
votes
2
answers
309
views
How do you distinguish between missing momentum from a neutrino and from dark matter?
I thought googling this would give me an answer quite quickly, but actually couldn't find much, so maybe it's a silly question. But I read that dark matter searches rely on measuring missing momentum ...
- 979
11
votes
2
answers
547
views
If neutrinos are disfavoured as DM candidates why aren't axions?
Numerical simulations of observed large-scale structure formation work best with Cold Dark Matter (CDM; see the answer here). Neutrinos are candidates for Hot Dark Matter (HDM), and hence they cannot ...
- 26.8k
4
votes
2
answers
812
views
How do we know that the dark matter is cold or non-relativistic? [duplicate]
According to the $\Lambda$CDM parametrization of the Standard Model of Big Bang cosmology, the universe contains a cosmological constant $\Lambda$ associated with $73\%$ dark energy, $23\%$cold dark ...
- 26.8k
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
0
votes
0
answers
45
views
Can the newly discovered mass of the neutrino explain in part, the missing matter [duplicate]
This question is related to the recent discovery of the neutrino mass 0.320 ± 0.081 eV/$c^2$.
Could this account for at least some of the Dark Matter/Missing matter of the universe?
- 753