It's called Einstein Field Equations for gravitational fields.

The LHS term $G_{\mu v}$ is the Einstein Tensor

$$G_{\mu v}=R_{\mu v}+\frac{1}{2}g_{\mu v}R$$

which gives information about how the geometry of spacetime is altered by the presence of e.g. matter, pressure, energy and momentum in the universe, which are described mathematically by the $T_{\mu v}$ term- the Energy-Momentum Tensor

To be able to derive this, you need to have a rigorous mathematical background in

-Partial differential Equations

-Linear Algebra

-Tensor calculus/differential geometry

It's called Einstein Field Equation for gravitational fields.

The LHS term $G_{\mu v}$ is the Einstein Tensor

$$G_{\mu v}=R_{\mu v}+\frac{1}{2}g_{\mu v}R$$

which gives information about how the geometry of spacetime is altered by the presence of e.g. matter, pressure, energy and momentum in the universe, which are described mathematically by $T_{\mu v}$ - the Energy-Momentum Tensor on the RHS.

To be able to derive this, you need to have a rigorous mathematical background in

-Partial differential Equations

-Linear Algebra

-Tensor calculus/differential geometry.