WARNING!
Do not read further if you are prone to hissy fits.
"The existence of dark matter has been firmly established from its gravitational interactions,..."
Wow! There is an overreach!
Objectively speaking what is apparent is gravity of some sort.
The gavity, only the gravity & nothing but the gravity.
"... carry some sort of DARK electromagnetic force..."
Coud one please define 'dark energy'.
(Thank goodness academics don't buffalo chip their way through things.)*
DM would have to be linked(?) by these photons to baryonic matter?
So the inertialess DM is always immune to gravity, and only towed along by baryonic matter as it alone is attracted by exo-galactic curvature?
Logically, mechanically i think that works,
but a tow chain photon linkage begs my credibility.
And inertialess mass IS an oxymoron.
Doesn't that equate with some baryonic matter just towing extra gravity along with it?
Oh well.
Me thinks thou doth grasp at straws.
Thought,
Maybe this is designed more to draw attention for their hypothetical particle, the dark photon, than a 'serious' (oxymoronic?) proposal for DM?
Scoring points as the savior of the DMies?
Again, in galaxies, hypothetical DM would require self-contradicting responses to gravity, namely intra-galactic immunity and exo-galactic attraction.
And to me that is a bridge too far to reach.
But i have not gotten high in ivory towers like academics & other 'authorities',
how dare i question them with my mere 'common' rational questions.
*I have no problem with buffalo chiping, even by academics, but only with hypocrisy about denying it.