Function lookbackTime( z, H0, omegaM, omegaLambda )
- Description:
-
Lookback time. This returns the difference between the age of
the universe at time of observation (now) and the age of the
universe at the time when photons of redshift
z
were emitted.
- Parameters:
-
- z (floating point)
- redshift
- H0 (floating point)
- Hubble constant in km/sec/Mpc
- omegaM (floating point)
- density ratio of the universe
- omegaLambda (floating point)
- normalised cosmological constant
- Return Value (floating point):
- lookback time in Gyr
- Signature:
- double lookbackTime(double, double, double, double)