The authors are willing to make the leap that the ΛCDM model has utterly failed an needs to be abandoned. But they stubbornly refuse to consider how well as quite simple gravity based explanation can go towards resolving it, and don't make the leap to an alternative.
The phenomenon of the Dark matter baffles the researchers: the underlying dark particle has escaped so far the detection and its astrophysical role appears complex and entangled with that of the standard luminous particles. We propose that, in order to act efficiently, alongside with abandoning the current ΛCDM scenario, we need also to shift the Paradigm from which it emerged.
Fabrizio Nesti, Paolo Salucci, Nicola Turini, "The Quest for the Nature of the Dark Matter: The Need of a New Paradigm" arXiv:2308.02004 (August 3, 2023 (published in 2023(2) Astronomy 90-104).
2 comments:
Second author (Paolo Salucci) did a review of dark matter here
https://arxiv.org/abs/1811.08843
where he talks about correlations between baryonic and dark properties of galaxies as implying there must be a new particle that interacts with standard model particles. But he doesn't consider whether a graviton could match that description...
First author (Fabrizio Nesti) is a gravi-GUT theorist. Gravi-GUT gets Poincare symmetry and standard model symmetries from the same gauge field, so I assume that's how Nesti would hope to satisfy Salucci's demand.
@Mitchell
I've blogged Salucci's prior papers, including that one, repeatedly. He has been the most plain of astrophysicists in flat out saying that collisionless dark matter is inconsistent without observations, and that even self-interacting dark matter that doesn't interact non-gravitationally with Standard Model particles doesn't work.
I'm not familiar with Nesti's work and should probably give it a look sometime.
Nonetheless, I read this paper and just come away with a frustrated "so close, and yet so far" reaction. They could at least acknowledge a gravitational or fifth force solution as a possible alternative to dark matter particles, which would hardly be a radical leap, yet they don't.
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