All Questions
Tagged with quantum-field-theory cosmology
151
questions
6
votes
1
answer
348
views
What's the mathematical explanation of the emergence of magnetic monopoles during the early universe?
I would "simply" like to know the full mathematical explanation of:
Why do these topological defects occur in the first place?
And more importantly,
Why must these defects/particles carry ...
4
votes
2
answers
298
views
Scalar field displacement from the minimum of the potential gives rise to particles/dark matter, why?
In This paper (Kobayashi et al -- Lyman-alpha Constraints on Ultralight Scalar Dark Matter: Implications for the Early and Late Universe) it says, at the beginning of Section 3.1:
A light scalar ...
- 2,347
1
vote
1
answer
1k
views
What is time till false vacuum decay? (Which source is in error?)
https://arxiv.org/abs/1308.4686 says that the time till false vacuum collapse is just about the age of the universe:
ΛCDM ... can be achieved if the top quark pole mass is approximately 178 GeV
That ...
- 375
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
7
votes
1
answer
511
views
Does zero point energy really contribute to the cosmological constant?
The zero point energy is usually supposed to contribute to the cosmological constant. And the mismatch between the small cosmological constant compared with the huge zero point energy is deemed as one ...
- 4,452
4
votes
0
answers
409
views
What is the current status or resolution of Greisen–Zatsepin–Kuzmin (GZK) cosmic-ray paradox?
The Greisen–Zatsepin–Kuzmin limit (GZK limit) is a theoretical upper limit on the energy of cosmic ray protons traveling from other galaxies through the intergalactic medium to our galaxy.
A number of ...
- 4,336
1
vote
1
answer
69
views
Is the inflation theory based on the inflaton field or electronuclear force carriers decay? [duplicate]
Some sources introduce the inflaton field as the cause of the inflation period in the big bang theory, and some others relate it to the decay of electronuclear bosons. Which one of these is ...
- 11
8
votes
0
answers
258
views
The emergence of space-time from entangled states
I recently read an article by Yasunori Nomura (https://arxiv.org/abs/1711.05263), in which he says that space-time is an emerging phenomenon. At the same time, space-time disappears when the ...
- 956
4
votes
1
answer
79
views
Is the value of the scalar components of the Higgs field known?
As I understand the relevant popular sources (example), since the end of the Electroweak epoch, the Higgs field became fixed in the whole known Universe. Thus, we are somewhere on the deep blue part (...
- 8,247
6
votes
1
answer
147
views
Does Goldstone theorem have anything to do with Cosmic string
Cosmic strings are formed due to topological defects during symmetry breaking phase transition in early universe.
While Goldstone theorem states whenever we have continuous symmetry and it is ...
- 3,043
1
vote
1
answer
827
views
How are Dark Energy and the Inflaton Field related?
My understanding of Inflation Theory:
Before $10^{-35}$ seconds the universe began to cool and the Inflaton Field approached a false vacuum. When it reached this false vacuum, there was a constant ...
- 105
3
votes
1
answer
519
views
Cut-off energy necessary to avoid vacuum catastrophe
My understanding is that to obtain a finite vacuum energy density prediction from QFT, one must choose a cut-off point for the maximum allowed energy of a photon. Two seemingly natural choices are the ...
- 153
4
votes
2
answers
446
views
Can Higgs potential provide a cosmological constant?
Usually, in particle physics, people do not care about a constant term in scalar field potential. Rather, attentions are paid to the local profile at the minimum. But in the context of cosmology, the ...
- 3,691
1
vote
0
answers
85
views
To which particles does the inflaton field preferably couple?
I am studying the (p)reheating dynamics and I would like to know if it is a reasonable assumption to consider a generic inflaton field (not the Higgs-inflaton) to be coupled with the same intensity to ...
6
votes
1
answer
1k
views
In-in (Schwinger-Keldysh) formalism in cosmology
I'm working on some application of the Schwinger-Keldysh formalism in cosmology (studying correlation function during inflation).
I saw both the operator and the path integral approach, maybe ...
- 900