Poincaré algebra and quotient group

Click For Summary
SUMMARY

The discussion centers on the Poincaré algebra and its quotient group, specifically addressing the dimensionality of the quotient. It is established that the set Kx forms a six-dimensional Lie algebra due to the presence of six linearly independent vectors, M_{\mu\nu}, which arise from anti-symmetry. Furthermore, the quotient is confirmed to be a Lie algebra since t^4 is an ideal, as demonstrated by the last two commutation relations.

PREREQUISITES
  • Understanding of Lie algebras and their properties
  • Familiarity with anti-symmetry in vector spaces
  • Knowledge of quotient groups in algebra
  • Basic concepts of commutation relations in algebraic structures
NEXT STEPS
  • Study the structure of Lie algebras, focusing on the Poincaré algebra
  • Explore the concept of ideals in algebra, particularly in relation to quotient groups
  • Learn about anti-symmetry and its implications in vector spaces
  • Investigate commutation relations and their role in defining algebraic properties
USEFUL FOR

Mathematicians, physicists, and students of algebra interested in advanced topics such as Lie algebras and their applications in theoretical physics.

LCSphysicist
Messages
644
Reaction score
163
TL;DR
I am having trouble to understand the print below.
1607835351197.png

I see that the first four equations are definitions. The problem is about the dimensions of the quotient.

Why does the set Kx forms a six dimensional Lie algebra?
 
Physics news on Phys.org
There are only ##6## linearly independent vectors ##M_{\mu\nu}## by anti-symmetry and their images in the quotient give a basis.

The quotient is naturally a Lie algebra since ##t^4## is an ideal (by the last two commutation relations).
 

Similar threads

  • · Replies 3 ·
Replies
3
Views
1K
  • · Replies 15 ·
Replies
15
Views
3K
  • · Replies 19 ·
Replies
19
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 0 ·
Replies
0
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K