Critical Friedmann universe

Haug-Spavieri universe

Planck time

$t_p=\sqrt{t_h\frac{1}{2}{t}_c}$

$t_p=\sqrt{t_h{t}_c}$

Hubble time

$t_h=\frac{2t_p^2}{t_c}$

$t_h=\frac{t_p^2}{t_c}$

Reduced Compton time

$t_c=\frac{2t_p^2}{t_h}$

$t_c=\frac{t_p^2}{t_h}$

Planck length

$l_p=\sqrt{R_h\frac{1}{2}{\overline{\lambda }}_c}$

$l_p=\sqrt{R_h{\overline{\lambda }}_u}$

Hubble radius

$R_h=\frac{2l_p^2}{{\overline{\lambda }}_c}$

$R_h=\frac{l_p^2}{{\overline{\lambda }}_u}$

Reduced Compton time

${\overline{\lambda }}_c=\frac{2l_p^2}{R_h}$

${\overline{\lambda }}_u=\frac{l_p^2}{R_h}$