Function parallel_transport_kernel 

pub fn parallel_transport_kernel<T>(
    initial_vector: &[T],
    path: &[Vec<T>],
    christoffel: &CausalTensor<T>,
) -> Result<Vec<T>, PhysicsError>
where
    T: Field + Float + From<f64> + Copy,

Parallel transports a vector along a discrete path using Christoffel symbols.

Solves: $\frac{Dv^\mu}{d\lambda} = \frac{dv^\mu}{d\lambda} + \Gamma^\mu_{\nu\rho} \frac{dx^\nu}{d\lambda} v^\rho = 0$

Uses Euler method for simplicity along discretized path segments.

Arguments

• initial_vector - Vector $v_0^\mu$ to transport.
• path - List of positions along the path (each position is a slice of coordinates).
• christoffel - Christoffel symbols $\Gamma^\mu_{\nu\rho}$ (Rank 3 tensor [dim, dim, dim]).

Returns

• Ok(Vec<T>) - The parallel-transported vector at the end of the path.