The Stack Overflow podcast is back! Listen to an interview with our new CEO.

Questions tagged [spinors]

The tag has no usage guidance.

566 questions
Filter by
Sorted by
Tagged with
45 views

Why are twistors commuting?

In his book, Srednicki introduces the notion of twistor in chapter 50. It is described as a simply commuting spinor, as opposed to anti-commuting. How do we know that this object is simply commuting? ...
49 views

Co-spinors and contra-spinors

As i was reading my teacher's notes on $SU(2)$ and $SO(3)$, i have had this question. Why do co-spinors transform differently under a rotation than contra-spinors?
28 views

Computation with bispinors for a compatible pair of pure spinors in N=1 supersymmetric vacua compactified down to 4-dimension

I ask this question basically because I need help, just an hint, for a computation with bispinors. The background is string theory / supergravity, where many data of a supersymmetric vacuum can be ...
60 views

Weinberg Volume II: Abelian Anomaly Function

The following is from page 363 of Weinberg volume II. We wish to evaluate the RHS of \begin{align}\label{EQbbvbv} [d \psi][d \bar{\psi}] \rightarrow(\operatorname{Det} \mathscr{U} \operatorname{Det}...
44 views

Gamma Matrices as nonstandard numbers, and Grassman Numbers

I'm in the process of exploring the Dirac equation and its forms and consequences, and as such have just been initiated into the theory of spinors and their accompanying formalism. One of the things ...
32 views

What's the field strength and energy density of a spinor field?

The field strength and energy density of a vector field $A_\mu$ can be described using the field strength tensor $F_{\mu \nu}$. What is the field strength and energy density associated with a (Dirac) ...
38 views

$CP$-transformation for spinor field. $C$ and $P$ do not commute?

I am bothered by an exercise about CP transformations where I get the result that CP acting on a Dirac spinor field is not the same as the PC transformation. The exercise states the following ...