Timeline for taking the trace
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
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| Oct 2, 2013 at 3:52 | comment | added | Michael | Would like to mention that once you understand how it works, it is straightforward to make a computer algebra system (CAS) like Mathematica or more hep-th specific Cadabra do these tedious & mechanical manipulations for you. Just look at some of the Cadabra samples to get a gist of it. Though like any CAS use case I don't recommend you blindly trust the system: make sure you understand how it's working first. | |
| Oct 2, 2013 at 3:11 | vote | accept | alejandro123 | ||
| Oct 2, 2013 at 3:05 | answer | added | nervxxx | timeline score: 2 | |
| Oct 2, 2013 at 1:29 | comment | added | alejandro123 | the gamma matrices are the 4-tuple of dirac gamma matrices. the trace of the expression is supposed to be representative of the numerator of the propagator of two fermions in a Feynman diagram. and the gamma matrices followed by either a k, p or q are supposed to be equivalent to Feynman's slashe notation commonly used in fermion propagators. | |
| Oct 2, 2013 at 1:10 | comment | added | Brian Moths | what is the matrix $\gamma$? I have only seen expressions like these where $\gamma$ had a vector index. Typically then $k$ $p$ and $q$ also have vector indices which are contracted with the index from the $\gamma$. Also $k$ is being integrated over and we can get some mileage out of that fact. Is that the case here? | |
| Oct 2, 2013 at 0:44 | comment | added | alejandro123 | taking the trace of matrices. | |
| Oct 2, 2013 at 0:38 | comment | added | Nick | A good first step would be to define what you have written down. Are you taking the trace of a matrix, the trace of an operator, ... ? | |
| Oct 1, 2013 at 23:59 | history | asked | alejandro123 | CC BY-SA 3.0 |