All Questions
6
questions
2
votes
2
answers
98
views
Why does the mechanism producing matter-antimatter asymmetry keep our universe electrically neutral? Any general argument?
I've noticed what seems to be a fine-tuning issue. To be more specific, electric neutrality implies that the amount of lepton asymmetry produced through some unknown processes precisely cancels out ...
- 619
1
vote
1
answer
171
views
What is the third quantization and the creation and annihilation operators of universes?
We have only recently begun to undergo secondary quantization, and I know that for the introduction of the creation and annihilation operators, the existence of interacting quantum fields is necessary,...
- 956
3
votes
0
answers
122
views
Are trans-Planckian field values a problem for the relaxion?
The relaxion is a new model-building gadget that solves the hierarchy problem by allowing the Higgs mass term to dynamically relax to zero.
To describe it as simply as possible, leaving a lot out: we ...
- 103k
1
vote
1
answer
141
views
Why is the coupling of the matter field with the inflaton field neglected at the inflationary epoch?
The simplest model of inflation involves a hypothetical, yet undiscovered, single scalar field $\phi$ called \emph{inflaton}. The action of this scalar field minimally coupled to gravity is given by $$...
- 26.8k
3
votes
1
answer
249
views
How did dark matter become a relic?
Why did the decay rate of the dark matter particles fall when the temperature of the Universe $T_U$ dropped below dark matter mass $M_{DM}$?
In particular, why can it not decay into lighter particles ...
- 26.8k
7
votes
0
answers
438
views
750 GeV diphoton resonance: KK graviton?
As everybody of you may know at LHC they found this probable resonance (https://cds.cern.ch/record/2114808, https://cds.cern.ch/record/2114853?ln=en). It may be a scalar or a KK graviton mode. Now, ...
- 369