Weak-field approximation
= Weak-field approximation
The weak-field approximation requires every dimensionless component of the <metric perturbation> to have magnitude much smaller than one, so terms quadratic in the perturbation may be neglected.
= Weak-field approximation
The weak-field approximation requires every dimensionless component of the <metric perturbation> to have magnitude much smaller than one, so terms quadratic in the perturbation may be neglected.