The “field” concept is a useful theoretical construct in physics. Fields can be quantized. The electromagnetic field consists of quanta known as photons. In QFT (Quantum Field Theory) the elementary particles are thought of as quanta of their respective field. 630 more words

## Tags » QFT

#### QFT Resources

Quantum Field Theory is a notoriously difficult subject to learn, but I found the following resources to be extremely helpful when I took the course a few years ago. 142 more words

#### Entangled State Vectors

Let R1, R2 be von Neumann algebras on H such that R1 ⊆ R′2. Recall that a state ω of R12 is called a normal product state just in case ω is normal, and there are states ω1 of R1 and ω2 of R2 such that… 928 more words

#### Inquiring Minds Want to Know...

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“Eitherthe well was very deep, or she fell very slowly, for she had plenty of time as she went down to look about her and to…

#### Perturbative Nambu-Goto strings exist in any dimension

It is part of the narrative of string theory that quantum bosonic strings only exist in dimensions. As usual, it is not as simple as that. 1,143 more words

#### Locality in Quantum Field Theory and Hadamard point splitting

Given the title of my blog, the first post should be on *locality*. In Quantum Field Theory (QFT) there are two different notions of locality. 1,093 more words