Photon Density

From the post "One Plus One Plus One", in the case of photons,

$p_\rho=\sqrt{m_p}.\sqrt{2}c.G$

and

$p_\rho=0$

What is $p_\rho$?  $q_\rho$ is charge density, $m_\rho$ is mass density, so $p_\rho$ is the photon density; $q$, charge, provides the electrostatic force, $m$, mass, provides the gravitational force, so photon provides the photonic force.  The nature of this force depends on the exact nature of the photon.  Photons that exist in the $t_c$ time dimension are like charges.  Photons that exist in the $t_g$ time dimension are gravitational. Photons that exist in the $t_T$ time dimension are defined by their temperature, $T$.

$q$ is the inertia along the $t_c$ time axis, $m$ is the inertia along the $t_g$ time axis and so $p$ is the inertia along the respective time axes, $t_T$, $t_g$ or $t_c$.

However $p$, is oscillating between one time dimension and one space dimension.  It is travelling down a third space dimension.

$p=ap_\rho$

$p_{ \rho  }=\cfrac { 1 }{ 2ac^{ 2 }G^{ 2 } }$

where $a$ is the extend of $p$ along the line it is travelling down.