Pontryagin densities and Chern-Simons form

[shereen1]

Dear All
It is known that pontryagin densities are defined in even dimension space, let's say i am concerned with 4 dim space time. We also have a certain group G. What is the formula of pontryagin densities for arbitrary group? Larger group?

 

[Ben Niehoff]

There are only two independent (combinations of) Pontrjagin classes in 4 dimensions: the Euler class and the Hirzebruch signature.

I'm not sure what the rest of your question is asking.

 

[haushofer]

Shereen,

if you expect decent answers you should spend more time on your opening posts, giving references and contexts. I think I gave that advice before.

 

[shereen1]

Shereen,

if you expect decent answers you should spend more time on your opening posts, giving references and contexts. I think I gave that advice before.

sure i will.
Thank you