Yes; R_0/R = 1 + z where R_0 is the scale factor today.

I’m sure we can say that the scale length is smaller than R_0.

]]>R varies like 1 / (1+z) right?

I am also curious about the latest estimates of this scalelength. Has a consensus been reach as far as you know?

cheers

The physical scale will be smaller at higher redshift, yes.

]]>Does it mean that this scale is (1+z) smaller at a redshift z?

Thanks