He examines the possibilities and decides that photons probably do not really have mass. But even if they did, that wouldn’t help much with the puzzle that we need dark matter but can’t find it:
Even if the photon had mass, and was somehow able to explain the motions of all stars in a galaxy, not just the massive ones, it wouldn’t be able to explain the host of other observations (for example, how could a new electromagnetic force explain the gravitational bending of light around a galaxy cluster? It’s not a rhetorical question – it can’t). In other words, even in a cosmos filled with massive photons, we’d still need dark matter too. Paul M. Sutter, “Massive Photons Could Explain Dark Matter, But Don’t” at Universe Today
If we can’t even find dark matter, why are some speculating on infinities of infinities of universes?
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Before you go: Discover: Even the best dark matter theories are crumbling
Researcher: The search for dark matter has become a “quagmire of confirmation bias” So many research areas in science today are hitting hard barriers that it is reasonable to think that we are missing something.
Physicists devise test to find out if dark matter really exists
Largest particle detector draws a blank on dark matter
What if dark matter just doesn’t stick to the rules?
A proposed dark matter solution makes gravity an illusion
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Proposed dark matter solution: “Gravity is not a fundamental governance of our universe, but a reaction to the makeup of a given environment.”