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In cosmology the deceleration parameter defined as the
$$q_0 = \frac{1}{2}\sum_i\Omega_{i,0}(1+3w_i)$$
Is there a similar expression for the jerk parameter (##j_0##) ?
$$q_0 = \frac{1}{2}\sum_i\Omega_{i,0}(1+3w_i)$$
Is there a similar expression for the jerk parameter (##j_0##) ?