All Questions
13
questions
0
votes
1
answer
47
views
Electrons keeping dynamical quantum fluctuations?
I was thinking about this paper (https://arxiv.org/abs/1405.0298) where the authors argue that there wouldn't be dynamical quantum fluctuations in a De Sitter space as fluctuations would be static ...
- 2,462
0
votes
2
answers
122
views
Quantum fluctuations and symmetries?
While reading this piece about symmetry breaking, in section 3 I came across the term "anomalous symmetry breaking", which happens when a symmetry is broken by quantum fluctuations:
Let us ...
- 2,462
4
votes
0
answers
109
views
What is the best way to describe a classical field in quantum field theory (coherent state)?
In quantum field theory, we have the following expansion on a scalar field (I follow the convention of Schwarz's book)
$$\phi(\vec{x},t)=\int d^3 p \frac{a_p exp(-ip_\mu x^\mu)+a_p^{\dagger}exp(ip_\mu ...
- 442
3
votes
1
answer
99
views
Which of these 2 ideas is correct about a "bubble" of false vacuum decay?
The whole volume of the bubble is true vacuum.
Only the surface layer of the bubble is true vacuum while the interior has turned back to false vacuum.
7
votes
1
answer
511
views
Does zero point energy really contribute to the cosmological constant?
The zero point energy is usually supposed to contribute to the cosmological constant. And the mismatch between the small cosmological constant compared with the huge zero point energy is deemed as one ...
- 4,452
1
vote
1
answer
69
views
Is the inflation theory based on the inflaton field or electronuclear force carriers decay? [duplicate]
Some sources introduce the inflaton field as the cause of the inflation period in the big bang theory, and some others relate it to the decay of electronuclear bosons. Which one of these is ...
- 11
2
votes
0
answers
98
views
What's the difference, if any, between Soft Hair & Quantum Hair
In the early 90s, John Preskill, Sidney Coleman, Frank Wilzcek and Lawrence Krauss presented a series of papers [1][2][3] on Quantum Hair on Black Holes due to Cosmic strings in a number of ways ...
- 425
0
votes
0
answers
36
views
Could I use this informal explanation for Hawking radiation?
I need to explain Hawking radiation to my classmates for a homework. Could I use this informal explanation? (unfortunately without math). Correct me if I need to change/add something:
Quantum ...
- 21
2
votes
1
answer
527
views
Are quantum fluctuations in space real or virtual?
According to the uncertainty principle, the uncertainty in energy $\Delta E$ in a region of otherwise empty space $\Delta x$ is approximately
$$\Delta E \sim \frac{hc}{\Delta x}.$$
Thus there should ...
- 5,925
1
vote
1
answer
396
views
Is there a correlation between Brownian motion and cosmic microwave background radiation?
Is there any correlation between Brownian motion, the phenomenon of osmosis - compared to cosmic microwave background, the Noise we see in analog television?
Brownian motion or pedesis (from Greek: ...
- 41
1
vote
1
answer
42
views
Lifting an analogy of a pond to question signals at natural or artificial boundaries in space-time [closed]
I conjured up an idea to lift an analogy into the language of QFT and GR. I thought up the universe as a pond with a liquid. If we imagine a liquid poured into some pond (sort of bang and inflation ...
user37343
2
votes
0
answers
308
views
Computations for Quantum Vacuum Fluctuations
For quite some time the notion of quantum vacuum fluctuations is bothering me.
What exactly is the theoretical origin of this notion? This notion has become quite common in physics and is used to ...
- 10.1k
3
votes
2
answers
389
views
Can the vacuum energy be made finite with quantized space
From what I know the reason we have infinite vacuum energy is because according to Quantum Field Theory at every point in space we have something analogous to a harmonic oscillator but since the Zero ...
- 182