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Results tagged with quantum-field-theory
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user 193224
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.
2
votes
0
answers
78
views
Why chiral Majorana fermions with finite momentum are called as an Majorana fermion?
For a $p_x+ip_y$ superconductor, at its boundary there will be an edge state
$$
\gamma_{p} = \alpha_pc_p + \alpha_{-p}^*c_{-p}^\dagger,
$$
where $c_p$ is an ordinary fermion operator and $p$ denotes …
- 337
4
votes
1
answer
656
views
Feynman propagator for interacting field
For scalar field, Feynman propagator is commonly defined as
$$
\Delta_F(x-y) = \langle 0 | T\phi(x)\phi(y)|0 \rangle .
$$
For free theory, field satisfy equation of motion is $$\phi(x) = \int\frac{dp …
- 337