All Questions
Tagged with dark-energy vacuum
32
questions
-2
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0
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30
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Can Poincaré recurrences happen eventually in a universe with zero vacuum energy?
I am interested in the topic of possible vacuum up-tunneling and down-tunneling events in cosmology. One popular instance of this is a vacuum decay from a metastable vacuum energy level to a "...
- 2,472
3
votes
1
answer
503
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Does energy exist on its own? [closed]
So to my understanding as a layman is that energy transfers from one material to another (I guess that's why there's potential and kinetic energy), for example photons to solar panels. Now my question ...
- 149
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0
answers
36
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What is the formalism for calculating the vacuum energy density from the observed data of the expansion of the universe?
Wikipedia states here the calculated effective vacuum energy density value of free space from the observed and collected cosmological constant data of the 2015 Planck telescope satellite mission. But ...
- 4,170
-3
votes
1
answer
84
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Can matter and light exist without the free space absolute vacuum?
According to the standard model of particle physics, is matter and light possible to exist without the existence of the omnipresent vacuum?
By "vacuum" here I mean the ideal perfect vacuum ...
- 4,170
5
votes
1
answer
739
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What does it mean for a black hole to be "filled" with vacuum energy?
I've read the recent news about non-Kerr black holes coupling to the universe's expansion rate, and it looks like an excellent fit to the data. From the paper, I understand that these black holes grow ...
- 278
1
vote
1
answer
103
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By what experiment is the vacuum energy density actually measured?
I have heard that the actual vacuum energy density which is up to 120 orders smaller than the predicted QED value can be measured in experiments or cosmological observations?
What are these ...
- 4,170
0
votes
0
answers
45
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Why is the quantum vacuum space energy density not measurable?
I'm referring to the vacuum catastrophe unsolved problem where the Plank length quantum calculation of the vacuum space energy density:
$$
\rho_{\mathrm{P}}=\sqrt{\frac{c^{14}}{\hbar^2 G^4}} \approx 4....
- 4,170
-3
votes
1
answer
112
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Is the speed of light $c$ invariant with the vacuum space energy density? [duplicate]
Vacuum space energy density is related to the speed of light in a vacuum $c$ as:
$$
\Lambda=8 \pi \rho_{v a c} G / c^4=\kappa \rho_{\text {vac }}
$$
where $\rho_{v a c}$ is the vacuum energy density ...
- 4,170
1
vote
1
answer
184
views
Is it a fact that vacuum energy exists?
I have always read that vacuum energy and zero point energy are established facts of physics supported by various observations of their effects both indirectly and even directly. But I have also read ...
- 2,472
0
votes
0
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76
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Relationship between expanding space and dark energy [duplicate]
The excerpt below has been taken from a pop-science article.
Dark energy is thought to be different, though. Rather than being a type of particle, it appears to behave as though it were a type of ...
- 717
1
vote
1
answer
144
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How is synthesized Vacuum different from the one in the Universe?
This question is with reference to Torricelli's Vacuum Barometer which was one of the first experiments involving vacuum creation in Laboratories. The Atmospheric pressure causes a rise in the mercury ...
- 21
-3
votes
1
answer
153
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Why do some scientists believe that the zero point radiation of the vacuum is incredibly powerful?
I've been doing some research and i read about zero point energy. I've heard that a couple cubic cm of it can boil the earth's oceans. how does this work if the energy is only 2.7 kelvin? and what are ...
user320481
2
votes
1
answer
65
views
Would the cosmological vacuum heat a hollow box?
The energy scale of the cosmological vacuum is about $10^{-3}\mbox{eV}\approx10\mbox{K}$.
Imagine cooling an insulated hollow metal box with a vacuum inside it down to near $0\mbox{K}$ and then ...
- 5,925
10
votes
8
answers
1k
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About the "worst prediction in all of physics": the cosmological problem
Physicist Sabine Hossenfelder on YouTube just recently posted a video about vacuum energy, the cosmological constant and the "worst prediction" in physics. The worst prediction in physics ...
- 863
-2
votes
1
answer
78
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Vacuum space has mass/energy?
It is said that vacuum spaces contain particles and antiparticles, my question is if so whether empty space has mass/energy?
- 11