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Results tagged with quantum-field-theory
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user 29990
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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Stress-Energy tensor in different vacua from De Witt paper
The equations (175)-(176), describing the relation between the expectation value of the stress-energy tensor in $in$ or $out$ vacua and the one obtained by differentiation of the effective action, of …
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An intuition on the Rindler modes
When we are solving the Klein-Gordon equation for the quantization of a massive scalar field on the Minkowski spacetime, we may use the global coordinates and obtain the usual quantization with plane …
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Time evolution of generalized angular momentum operator
We define this operator :
$$M^{\mu\nu} = \int d^3x~(x^{\mu}T^{0\nu} - x^{\nu}T^{0\mu})$$ where $T_{\mu\nu}$ is the energy momentum tensor (see e.g. Energy momentum tensor from Noether's theorem) for …
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Long range order in the BCS ground state
I am trying to prove the following equivalent form for long-range-order in superconductivity (Annett's book states something like this) :
\begin{equation}\lim_{|R-R'|\to \infty}\langle\psi^{\dagger} …
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Quantization on Minkowski/Schwarzschild spacetimes based on unusual surface
I'm reading the book of Wald "Quantum Field Theory in Curved Spacetime and Black Hole Thermodynamics", and I'm pondering on this problem:
In Minkowski spacetime, we usually quantize our fields with …
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