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Results tagged with quantum-field-theory
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user 26161
Quantum Field Theory (QFT) is the theoretical framework describing the quantisation of classical fields which allows a Lorentz-invariant formulation of quantum mechanics. QFT is used both in high energy physics as well as condensed matter physics and closely related to statistical field theory. Use this tag for many-body quantum-mechanical problems and the theory of particle physics. Don’t combine with the [quantum-mechanics] tag.
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What is the temperature of vacuum?
I wonder what the temperature of vacuum is. Is it the absolute zero？
The vacuum is defined without taking into account the Unruh effect or the CMB，it is just vacuum with nothing in it but quantum fluc …
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What does effective quantum field theory mean?
By renormalization, we have renormalized quantum field theory, usually, we call the theory by effective QFT. What does effective quantum field theory mean? It means we have different quantum field th …
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Question about infinite sum in quantum field
I read from some books of number theory that $$\sum_{n=1}^{\infty}\frac{1}{n^s} = -\frac{1}{12}\text{,when } s=-1.$$
Now is there such a result $$\sum_{n=1}^{\infty}\frac{1}{n^s} = \pi \text{,when } …
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Is there any renormalization group with infinite number of generators that does not satisify...
A generating set of a semigroup(monoid) is a subset of the semigroup set such that every element of the semigroup can be expressed as a combination (under the semigroup operation) of finitely many ele …