# Derivation of 8πG/c^4

1. Nov 2, 2015

### shounakbhatta

Hello All,

In GR the factor 8piG/c^4. I want to understand how the term is derived? I mean to say that is this related to Friedmann Equation. How the factor actually comes into Einstein's field equation?

I am sorry if I am unable frame the question properly.

Thanks.

-- Shounak

2. Nov 2, 2015

### Staff: Mentor

The G/c^4 term is there for dimensional consistency. The 8 pi is required so that GR reduces to Newtonian gravity in the appropriate limit.