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Results tagged with quantum-field-theory
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user 214046
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.
1
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Field redefinition changing energy of one particle states
This is a very interesting question. Think about this: what happens if you add an electric potential to the original field (by minimal coupling)? You will see the same result! $\alpha$ in your express …
- 118
0
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Accepted
How to obtain time-ordered density correlation function of free Bosonic system via Wick's th...
I have figured this out myself... The crucial point is that the non-equal time commutation relation $[a(t), a(t')]=0$ for free Bosonic fields (the same for $a^\dagger$).
(In the context of high energ …
- 118
1
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1
answer
421
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How to obtain time-ordered density correlation function of free Bosonic system via Wick's th...
Consider a free Bosonic system. The Hamiltonian is given by
$$
H=\sum_k \frac{k^2}{2m}a_k^\dagger a_k.
$$
Since the spectrum is gapless, the ground state can be of any particle number (or even superpo …
- 118