2.1 General Relativity 7 R is the Ricci Scalar , given by with g µν being the inverse metric. In Eq. (2.4), G is Newton’s Gravita- tional Constant and T$_{µν}$ is the Energy-Momentum Tensor , also known as the Stress-Energy Tensor, which is defined as where the T$_{00}$ component in red is the energy density, the T$_{i}$$_{0}$ components in orange are the momentum density, the T$_{0}$$_{i}$ components in orange are the energy flux, the components in blue are the shear stress and the T$_{ii}$ com- ponents in green are the pressure. The T$_{ij}$ components are the momentum flux. Sometimes the LHS of Eq. (2.4) is combined into a single tensor, known as the Einstein Tensor The Einstein Field Equation relates the curvature of a region of spacetime, i.e. the strength of gravity, to the amount of energy, momentum and stress that is present within that spacetime region. G$_{µν}$ ≡ R$_{µν}$ − 1 2 g$_{µν}$R (2.9) T$_{µν}$ ≡    $^{T}$$^{00}$ T 01 T 02 T 03 T 10 T 11 T 12 T 13 T 20 T 21 T 22 T 23 T 30 T 31 T 32 T 33     R ≡ g $^{µν}$R$_{µν}$ (2.8)