Recent content by mhob

Are they the same object?

OK, I know use the Bianchi identity Rμ[νρσ]=0 Thanks! ShayanJ!

I'm not sure Rμνρσ = Rμ(νρ)σ or not? If so, the problem solved for me. Thanks.

How to proof that εμνρσ Rμνρσ =0 ? Thanks.

The appendix of the paper `Actions for Gravity ...' by Peldan may can help you.

Iz rite! Thanks a lot.

I was impressive with that paper but someone has deleted it from my computer, left only this figure from it.

Why you like to incorporate exotic smoothness with string theory not loop quantum gravity or others?

Thanks.

What are the difference between Einstein's General Relativity and Wheeler's Geometrodynamics,or they are the same thing?

In Wald's book he write: "Thus, the distinction between the index notation and the component notation is much more one of spirit (i.e., how one thinks of the quantities appearing) than of substance (i.e., the physical form the equations take)." So,don't worry it much .

But what if in quantum gravity?

It's depends on what doyou think fundamental ,GRAVITY or QUANTUM behavior.

Thank!