Register to reply 
Lorentz generators 
Share this thread: 
#1
Feb1307, 12:16 PM

P: 46

Could somebody please show me the calculation which shows that the M_mu_nu representation of the Lorentz generators gives rise to a (1,0)+(0,0) representation? Thanks in advance



#2
Feb1407, 12:21 AM

Sci Advisor
HW Helper
P: 11,926

I don't think this is possible. [itex] M_{\mu\nu} [/itex] is different for every representation and the calculations are actually the other way around. The generators are computed by knowing how the spinors behave under restricted LT's.



#3
Feb1407, 02:41 AM

P: 46

Thanks for the reply. I am sorry probably my notation is uncommon. When I said M_{\mu\nu} I meant the representation of the Lorentz generators when acting on a Lorentz 4vector(so antisymmetric matrices, when all indices are raised). Also the way I learned it we started at differrent reps of the Lorentz generators and then afterwards defined the fields the transformation could act on and deduced its properties  seems to me to be some sort of chicken and egg problem. However I thought that it should be possible to compute that the vector representation is (1,0)+(0,0) as this is basically the spin of the object.



#4
Feb1407, 03:51 AM

Sci Advisor
HW Helper
P: 11,926

Lorentz generators
Actually the vector representation is (1/2,1/2). (1,0)+(0,0) is a reducibile representation and is made up of a selfdual 2form and a scalar.



Register to reply 
Related Discussions  
Differences between Lorentz scalars and Lorentz invariants  Special & General Relativity  3  
How to get inverse Lorentz tranformation from direct Lorentz transformation  Special & General Relativity  13  
Lorentz transformation and lorentzeinstein transformations  Special & General Relativity  1  
Difference between lorentz invariant and lorentz covariant  Introductory Physics Homework  4  
EMP generators  Electrical Engineering  7 