A Why does equation 35.21 have an extra minus sign?

  • A
  • Thread starter Thread starter sunshine9
  • Start date Start date
  • Tags Tags
    Index Spinors
sunshine9
Messages
1
Reaction score
0
TL;DR Summary
Hi,everybody,I'm reading Srednicki's qft textbook,and I'm puzzled by the calculation about spinor indices.I can't realize Eq35.21.
Eq35.17 and 35.18 is obtained,but the result of Eq35.21 I obtained has an extra minus sign,I don't know what's wrong of my calculation,so I hope some people much more smarter can figure it out.Thanks.
1602925250383.png
 
Physics news on Phys.org
The minus sign in equation 35.21 is most likely due to a mistake in the algebraic manipulation of the equation. You can try double-checking your work to see if you can spot where the error is, or you can try consulting with someone else who is better at algebra to help you find the mistake.
 

Thread 'Quantum Entanglement is a Kinematic Fact, not a Dynamical Effect'

Insights auto threads is broken atm, so I'm manually creating these for new Insight articles. Towards the end of the first lecture for the Qiskit Global Summer School 2025, Foundations of Quantum Mechanics, Olivia Lanes (Global Lead, Content and Education IBM) stated... Source: https://www.physicsforums.com/insights/quantum-entanglement-is-a-kinematic-fact-not-a-dynamical-effect/ by @RUTA
View full post »

Thread 'Quantum behaviour of an electron around a positively charged sphere'

If we release an electron around a positively charged sphere, the initial state of electron is a linear combination of Hydrogen-like states. According to quantum mechanics, evolution of time would not change this initial state because the potential is time independent. However, classically we expect the electron to collide with the sphere. So, it seems that the quantum and classics predict different behaviours!
View full post »

Similar threads

A Ballentine on the "multicomponent state function"
Replies
1
Views
1K
I Linearized Gravity & Metric Perturbation when Indices Raised
Replies
17
Views
2K
QFT: Mandl & Shaw, Page 297 - An Extra Minus Sign
Replies
8
Views
2K
I Lorentz transformation of the "bilinear spinor matrixelement"
Replies
7
Views
2K
A The eigenvalue power method for quantum problems
Replies
2
Views
2K
I The standard model from loop quantum gravity via spinors octonions
Replies
26
Views
4K
Other Would it be advisable to take an extra year before graduating?
Replies
8
Views
3K
Why do Feynman rules have minus signs?
Replies
1
Views
3K
Does the Dirac ground state of the H atom have an electron current?
Replies
2
Views
2K
Why there is a minus sign in the Killing's equation
Replies
2
Views
2K

Hot Threads

Recent Insights

Back
Top