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This is lecture 0: what is QFT and how will this course be taught? This provides a short 18 minute description of what the quantum field theory is about, together with a short summary of topics. The…
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Physics 4Q03 Lecture 01. This lecture reviews several topics usually already encountered in earlier courses such as fundamental units, Dirac's bra and ket notation for quantum mechanics, the…
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Physics 4Q03 Lecture 02. This lecture describes several issues associated with multiple-particle states in quantum mechanics, including the classification of all particles as bosons or fermions and…
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Physics 4Q03 Lecture 03: This lecture provides the foundation of much of what follows: the definition and properties of creation and annihilation operators. These operators provide a basis in terms…
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Physics 4Q03 Lecture 04: This lecture extends the notions of creation and annihilation operators to fermions, and derives the anticommutation algebra that these satisfy. The lecture also sketches out…
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Physics 4Q03 Lecture 05: This lecture reviews the formalisms of time-independent and time-dependent Rayleigh-Schrodinger perturbation theory for quantum mechanics.
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Physics 4Q03 Lecture 06: This lecture uses the results for time-dependent perturbation theory to calculate transition rates in terms of the matrix elements of the interaction Hamiltonian, culminating…
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Physics 4Q03 Lecture 07: This lecture applies Fermi's Golden Rule to evaluate the rate for photon emission by an excited atom. This example is also used to illustrate the phenomenon of…
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4Q03 Lecture 08: This lecture continues to convert Fermi's Golden Rule to continuum normalization, doing so for a simple absorption process and then for a general scattering process, defining…
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Physics 4Q03 Lecture 09: This lecture introduces coherent states, and derives them as the eigenstates to which a bosonic system is often driven in the presence of persistent stimulated emission. The…
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This is the QFT tutorial for Jan 11, 2021
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This is the QFT Tutorial for Jan 13, 2021.
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This is the QFT Tutorial for Jan 14, 2021
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This is the QFT tutorial for Jan 18, 2021
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This is the QFT tutorial for Jan 20, 2021
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Physics 4Q03 Tutorial for Jan 21, 2021
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Physics 4Q03 Tutorial for Jan 25, 2021.
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Physics 4Q03 Tutorial for Jan 27, 2021.
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Phys 4Q03 Tutorial for Jan 28, 2021. (This one mistakenly has a music track appended from a playlist that was playing when I was setting up and which I forgot to turn off because i could not hear it…
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Phys 4Q03 Tutorial for Feb 1, 2021.
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Phys 4Q03 Tutorial for Feb 3, 2021.
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Phys 4Q03 Tutorial for Feb 4, 2021.
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4Q03 Lecture 10: This lecture computes the energy shift of a particle due to its interaction with another, introducing ultraviolet divergences and the concept of renormalization along the way. The…
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4Q03 Lecture 11; This lecture argues why the Hamiltonian should arise as a local function in space, and this is used to motivate the definition of position-space fields. The local form for the…
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