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by itishappy
388 days ago
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We need a model that includes electromagnetism. The author isn't the only one making this claim. When we do magnetohydrodynamic cosmological sims we consistently find surprising effects. The recent simulation showing that black hole accretion disks are supported by magnetism comes to mind.[0][1] Apologies, I know this is typically considered bad form, but have you gotten to the following section in the article?[2] It appears to directly contradict your claims. > MOND’s also been around since the early 1980s, but, in 2021, it finally developed a model – the Aether-Scalar-Tensor framework, or AeST – which ALSO maps perfectly onto the acoustic peaks revealed by WMAP and Planck. (It does it by proposing a new vector field and scalar field that duplicate the effects of Cold Dark Matter in the early universe... [0] https://astro.theoj.org/article/93065-an-analytic-model-for-... [1] https://www.caltech.edu/about/news/cosmic-simulation-reveals... [2] https://theeggandtherock.com/i/158515951/more-matter-or-less... |
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> MOND’s also been around since the early 1980s, but, in 2021, it finally developed a model – the Aether-Scalar-Tensor framework, or AeST – which ALSO maps perfectly onto the acoustic peaks revealed by WMAP and Planck. (It does it by proposing a new vector field and scalar field that duplicate the effects of Cold Dark Matter in the early universe
This doesn't contradict what I said. These models are not simply removing DM, I said people have tried with modified gravity models like these. First the models which fit the CMB were engineered to do, and each model has many more free parameters than dark matter. And note they have replaced invisible matter with an invisible matter-like field, it's not a simplification. Remembering that cold dark matter predicted these features, with fewer parameters and it is a physical model, not merely a fit. People have run simulations with the more basic MOND models, to find it cannot form realistic structure. Generally it forms structure more quickly than standard cosmology. Finding they need to add dark matter to their already modified gravity models to get something reasonable.
https://arxiv.org/abs/2007.00555
https://arxiv.org/abs/2305.05696
https://arxiv.org/abs/1309.6094