All Questions
7
questions
7
votes
0
answers
132
views
Is GR the only theory in physics which cares about absolute energy?
In my QFT course, they justify dropping the vacuum energy as 'physics only cares about relative energies except for GR in the stress-energy tensor'.
Is this strictly true?
- 2,604
1
vote
2
answers
431
views
Do quantum fluctuations in the inflaton field lead to fluctuations in the potential energy density?
During inflation there are quantum fluctuations in the inflaton field. Do quantum fluctuations in the inflaton field lead to fluctuations in the energy density?
- 455
0
votes
1
answer
74
views
Energy density drops in all regions of space in Standard inflation, and in some regions of space in Chaotic/Eternal inflation
Why does Standard inflation say that energy density drop in all regions of space and inflation stops, while Chaotic/Eternal inflation say that energy density drop in some regions and some other ...
- 855
1
vote
1
answer
125
views
Is quantum theory useful to describe the whole cosmos? [closed]
We often say that QFT describes the nature on a fundamental level. However this is indeed a very complicated theory for which the calculations related to the interaction of just a few particles simply ...
user56963
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
0
votes
1
answer
139
views
Can the energy of the universe ever be infinite in qunatum physics? [closed]
Suppose that the universe runs under some variants of QFT, with universal wavefunction and Hamiltonian. Then would infinite energy of the universe ever be possible? According to what I am thinking, ...
3
votes
1
answer
515
views
Negative energy and large-scale spacetime structure
I was reading an essay from Stephen Hawking's on the Space and Time warps and I was trying to make sense on some statements referring to the Casimir effect such as:
The energy density of empty ...
- 195