All Questions
6
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False Vacuum State (QFT)
I am wondering if someone can refer me to a proof that the false vacuum state is a natural consequence of scalar field theories? I see that being said in a lot of texts on cosmology when discussing ...
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4
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2
answers
298
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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
5
votes
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answers
158
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Meaning of the simplest potential of quintessence models. Fields in denominator?
I am reading Sec. 1.12 of the Cosmology book by Weinberg.
In this section he explains the very simple model of quintessence which attempts to provide a dynamical explanation of the smallness of the ...
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Do quantum fields with energy stored in it usually exert pressure?
There are types of quantum fields in the universe like spinor, vector, tensor, scalar fields.
Do these fields with energy stored in it (as energy density) usually exert pressure, or be pressureless?
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1
vote
1
answer
122
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Temperature and particles and fields
When I studied Thermodynamics the way I learned things and the way I understood them is that temperature is a quantity that appears and is relevant just when studying macroscopic matter.
Indeed, all ...
- 36.4k
9
votes
1
answer
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What is meant by the term "value" of a scalar quantum field?
During the slow roll of a scalar field, the scalar field is changing its value over time. But what is meant by the term "value" of a scalar field? Since the scalar field is quantized, I don't ...
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