All Questions
Tagged with dark-matterbeyond-the-standard-model
53 questions
0votes
0answers
39views
Sterile neutrino dark matter candidate - mass eigenstate or Majorana?
If we consider the SM by adding right-handed neutrinos $\nu_R$ and Majorana-mass terms $$ \mathcal{L}_{M_{\nu}} = -\overline{\nu_L}m_D\nu_R - \frac{1}{2}\overline{\nu}_Rm_R\nu_R^c - \frac{1}{2}\...
1vote
0answers
66views
Majorana sterile neutrino interaction terms and Feynman rules
I am currently doing some investigation on sterile neutrinos charged under an additional $U(1)_X$ gauge group as a proposal for dark matter. As I am mostly doing this alone, I seek some confirmation/...
2votes
1answer
416views
Contribution of dark matter to running of physical constants
I read that "essentially everything in the Standard Model impacts the running of every physical constant in the Standard Model. So, if there is even a single particle missing from the Standard ...
- 459
1vote
0answers
83views
Equivalence of axion to fermion couplings
In order to solve the Strong CP problem through the axion, we introduce the axion-gluon coupling $$ \dfrac{a(x)}{f_a} \text{Tr}\, G\tilde{G}.\tag{1} $$ In a similar fashion, we may introduce the axion-...
1vote
1answer
274views
Does NFW profile work for any galaxy?
We use Navarro–Frenk–White (NFW) to calculate Dark Matter (DM) density. Can we use it for DM halo in any galaxy or is it used only for Milky Way (MW)?
- 11
2votes
0answers
61views
Slope in interaction strength vs mass for QCD axion
The theory models of QCD axion, i.e. those who solve the strong CP problem, all have a prediction that follows a band with a slope in the space interaction strength vs. axion mass. (1) What does cause ...
2votes
0answers
30views
Lifetime of a WIMP [duplicate]
I have been watching videos of WIMP's and have a simple question.. The larger the particles, the shorter their lifetime. A top quark is so massive that it cannot form a "stable" bond with ...
- 2,764
3votes
1answer
132views
Could a fourth family of quarks and leptons account for dark matter?
In the early universe, could a family of quarks and leptons have formed an electrically neutral particle that is dark matter?
user361671
1vote
1answer
76views
Classification of elementary particles that have been proposed to explain dark matter
I'd like to write a paragraph about elementary particles that have been proposed to explain dark matter, but I don't know exactly how to classify these particles or arrange them: Scaler field -- ...
1vote
1answer
70views
Right-handed neutrinos as dark matter and neutrino bounds
How can right-handed neutrinos evade the SM experimental bound $N_\nu=3$ and become all the dark matter?
- 6,813
0votes
0answers
152views
Right-handed neutrinos Lagrangian and drawing Feynman diagrams from it
The Lagrangian for the right handed neutrino field is: $$ L_{\nu} = y_{\alpha i} \bar{L_{\alpha}} H^{\dagger} N_{i} + m_{i} \bar{N^{c}_{i}N_{i}} $$ With $ L_{\alpha} $ being the left-handed lepton ...
- 63
0votes
0answers
78views
Assuming the announced $g-2$ experiment αμ discrepancy is mainly because a dark matter candidate, is this a quantum gravity induced effect?
The possible effectively extra added vacuum polarization by a dark matter candidate could account for the recently announced anomalous magnetic moment αμ measured discrepancy from the theoretical ...
- 4,460
1vote
0answers
39views
Proposed dark matter mass limits
A recent paper (arXiv version also available) proposes to derive dark matter mass ranges of $10^{-3} \sim 10^{7} eV$ for a singlet scalar, parity-violating pseudoscalar, or spin-2 candidate, $10^{-21}\...
- 990
1vote
1answer
82views
What sort of observations constrain the QCD interactions of dark matter?
Within our current limits of observation, dark matter (DM) is nonluminous i.e., it neither absorbs nor gives off electromagnetic (EM) radiation. This tells that DM is electrically neutral having no EM ...
- 27.6k
3votes
0answers
54views
What properties of dark matter can we derive from each of the available methods for probing the physics of dark matter?
This is probably a long shot but it's worth trying. My question is the following: What properties of dark matter can we derive from each of the available methods for probing the physics of dark matter?...
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