Function geodesic_deviation_kernel 

pub fn geodesic_deviation_kernel(
    riemann: &CausalTensor<f64>,
    velocity: &CausalTensor<f64>,
    separation: &CausalTensor<f64>,
) -> Result<CausalTensor<f64>, PhysicsError>

Calculates Geodesic Deviation acceleration: $A^\mu = -R^\mu_{\nu\sigma\rho} V^\nu n^\sigma V^\rho$.

Describes the relative acceleration of nearby geodesics.

Arguments

• riemann - Riemann curvature tensor $R^\mu_{\nu\sigma\rho}$ (Rank 4).
• velocity - Tangent vector $V^\nu$ (Rank 1).
• separation - Separation vector $n^\sigma$ (Rank 1).

Returns

• Ok(CausalTensor<f64>) - Relative acceleration vector $A^\mu$.