All Questions
Tagged with dark-energy quantum-field-theory
13
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If dark energy has constant density, would it still be subject to quantum variations; would increase/decrease be symmetrical, or would one take over?
There are different suggestions, but it stills seems like the basic scenario is for dark energy to have constant density, as a property of space (and as represented by the cosmological constant in ...
- 15
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1
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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
3
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3
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340
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Why should dark matter and dark energy inherently require theoretical modification?
What we know more or less directly about both dark matter and dark energy is their spacetime curvature, and attempts to detect corresponding particles have thus far come up short as far as I've read. ...
- 2,475
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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
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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
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Does a grand unified field theory need to include a Dark Energy field? [closed]
Nobody has unified field theories yet but could dark energy if considered as a field be useful in this endeavour?
user291777
-2
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1
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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
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Cosmological constant (CC) vs vacuum energy density (VED)?
How are the two different? I know that CC has negative pressure and opposes gravity. But what about VED? Is VED supposed to have positive pressure and cause gravity too?
- 143
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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
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1
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519
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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
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Quintessential models for dark energy
Following Sean Carroll here
There are good reasons to consider dynamical dark energy as an alternative to an honest cosmological constant. First, a dynamical energy density can be evolving slowly ...
3
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1
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Why are we trying to fit GR in QFT when there's a chance that GR is incomplete?
GR explains most phenomena in our universe, but not everything.. Dark matter and Dark energy still don't fit in explanation of GR. QFT, on other hand, is almost complete. Shouldn't physicists go for ...
- 639
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Does empty space have energy?
My physics friend suggested that "the answer to why matter exists in the universe" is because all massive particles are just the fabric of space excited into little packets. To illustrate, imagine a ...
- 1,183