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I mean, dark matter specifically refers to mass of some kind that interacts gravitationaly but not electromagnetically. It posits a real, actual material floati
by ravi-delia 5y ago
I mean, dark matter specifically refers to mass of some kind that interacts gravitationaly but not electromagnetically. It posits a real, actual material floating around in space. MOND is another attempt to explain the gap, and it isn't dark matter at all.
- 6gvONxR4sf7o 5y agoI'm conflating them the way the article does: > But more importantly, if you look at the mathematics, modified gravity and particle dark matter are actually very similar. Dark matter adds new particles, and modified gravity adds new fields. But because of quantum mechanics, fields are particles and particles are fields, so it’s the same thing really. The difference is the behavior of these fields or particles. It’s the behavior that changes from the scales of galaxies to clusters to filaments and the early universe. So what we need is a kind of phase transition that explains why and under which circumstances the behavior of these additional fields, or particles, changes, so that we need two different sets of equations.
- ravi-delia 5y agoThe article makes the point that any evidence we have makes it difficult to disentangle the two, but the conclusions specifically calls for a third path. If dark matter was just any explanation for the mass gap, that third path would just be 'dark matter'.