I What Does the h Subscript 70 to the Power of 3 Mean in Supernova Units?

[resurgance2001]

Hi
This is a really basic question about units. I have been reading a paper about supernova rates and the units are given as:

SN rate per yr MPC^3. h_70^3 (10^ -4)

Could someone tell me what the h subscript 70 to the power of 3 means?

Thanks

 

[Orodruin]

It is a dimensionless number denoting the current rate of expansion. It is equal to the current Hubble rate divided by 70 km/s/Mpc.

 

[resurgance2001]

To the power of 3?

 

[resurgance2001]

Thanks

 

[Chronos]

A dimension is just another reference frame