This paper suggests that dark energy concentrated in black hole interiors (they use an unconventional BH model) could act like a cosmological constant. Their claim is that to calculate the equation of state (EoS) of the universe the pressure must be averaged everywhere and that the extreme negative pressures in their model of blackhole interiors makes up for their relatively tiny volume.
However, my understanding is that the "average" pressure of any slow-moving compact object is zero. For example, the walls of a mirror box containing a photon gas (EoS=1/3) are under tension (EoS<0) in proportion to the amount of light energy in the box. The average EoS of the gas + walls must be zero. Curvature has an EoS of -1/3, which again cancels out the pressure in the neutronium in a neutron star. Thus the BH model is irrelevent and the BH EoS is always zero. Is there a flaw in my reasoning?
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