lookback_distance

Protocols

StandardCosmology.lookback_distance()

DistanceMeasures.lookback_distance()

LookbackDistanceMeasures.lookback_distance()

HasLookbackDistance.lookback_distance()

Reference

cosmo.lookback_distance(z: InputT, /) → Array

cosmo.lookback_distance(z1: InputT, z2: InputT, /) → Array

Lookback distance \(d_T\) in Mpc.

The lookback distance is the subjective distance it took light to travel from redshift z1 to z2.

Parameters:

zArray, positional-only

z1, z2Array, positional-only

Input redshifts. If one argument z is given, the distance \(d_T(0, z)\) is returned. If two arguments z1, z2 are given, the distance \(d_T(z_1, z_2)\) is returned.

Returns:

Array

The lookback distance \(d_T\) in Mpc.