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New research suggests that our universe has no dark matter
- foobarkey 2y agoProbably not and its just our too primitive understanding and “trying to make the calculations work”
- notfed 2y ago[flagged]
- gmane 2y agoSorry, the conclusion in the paper really underlies how poorly the results fit the evidence: "The resulting almost doubling in the age of the Universe and increasing the formation times by 1 order of magnitude has been a subject of concern and requires that the new model also explain some critical cosmological and astrophysical observations" [0] Call me skeptical of the claims made. [0] https://iopscience.iop.org/article/10.3847/1538-4357/ad1bc6#apjad1bc6s4 https://iopscience.iop.org/article/10.3847/1538-4357/ad1bc6#...
- notfed 2y agoAny article/paper claiming nonexistence of dark matter that does not mention the bullet cluster should be sent to the spam folder.
- robwwilliams 2y agoI assume you are referring to gravitational lensing estimates of total matter versus visible?
- MattPalmer1086 2y agoThe bullet cluster is not the slam dunk proof of dark matter that is commonly supposed. For example, see this: https://tritonstation.com/2024/02/06/clusters-of-galaxies-ruin-everything/ https://tritonstation.com/2024/02/06/clusters-of-galaxies-ru...
- whatshisface 2y ago>So the unseen mass in clusters could just be ordinary matter that does not happen to be in a form we can readily detect. That is the same thing as dark matter...
- MattPalmer1086 2y agoNo. Dark matter is a proposed form of matter which does not interact with light. Normal matter we can't detect isn't dark matter - it's just currently undetected matter. As our observational ability improves we find more of it.
- whatshisface 2y agoThat's WIMPS, early candidates for dark matter included primordial black holes and dust.
- MattPalmer1086 2y agoA good point. I have heard of primordial black holes as a candidate for (at least some) dark matter. Not heard that dust was ever a candidate (if you have a reference it would be appreciated).
- petre 2y agoWIMPS are most probably not real. They'll keep searching but it's quite unlikely they'll find any. https://en.m.wikipedia.org/wiki/LZ_experiment https://en.m.wikipedia.org/wiki/LZ_experiment
- kelseyfrog 2y agoDark matter is a question, not a theory. WIMPS, sterile neutrinos, SIDM, primordial blackholes, MACHO, MoND, entropic gravity, &c all seek to answer the black hole question.
- ahazred8ta 2y agoBaryonic (tangible) dark matter exists in the form of MACHOs, which includes small cold planetary-mass dwarf stars. But there's a limited number of these, and the Big Bang hydrogen helium ratio puts limits on the amount of baryonic matter there can be.
- 14 2y agoI think there are too many unknowns and we are nowhere near close to fully understanding our universe that we should be open minded to new ideas and see if they fit into our understanding. Dark matter is one explanation to the bullet cluster but perhaps there is another we just don't understand. Yes if someone has a perpetual motion machine to the spam folder but I am always open to hear new ideas to our universe.
- deleted 2y ago[deleted]
- MattPalmer1086 2y agoIt's a double edged sword. On the one hand the model helps to explain the "impossible early galaxy" problem (since the universe is older than we thought). On the other hand, if the universe is older there are other things that will need more research to figure out. You should be sceptical, but there is not as yet a reason to entirely reject it. I'm not really a fan of the tired light theories myself, but glad to see different ideas being explored.
- jetrink 2y agoI think we need a version of the New Battery Technology Checklist[1] for this type of article. (Though I understand that the research itself often just aims solve specific tensions in cosmology, and it is only the reporting that over-hypes it as a full replacement for dark matter.) Dear alternative dark matter theory claimant, Thank you for your submission of a proposed revolutionary theory to replace dark matter. Your new theory claims to be superior to dark matter models and will transform our understanding of the universe. Unfortunately, your theory will likely fail, because: [ ] It cannot explain galaxy rotation curves across all galaxy types. [ ] It fails to account for gravitational lensing observed in galaxy clusters. [ ] It cannot explain the Bullet Cluster observations where dark matter appears separated from normal matter. [ ] It is inconsistent with the cosmic microwave background anisotropies. [ ] It cannot explain the large-scale structure and formation of the universe. [ ] It introduces arbitrary parameters without physical justification. [ ] It lacks a sound theoretical foundation or violates established physics principles. [ ] It fails to explain the observed velocity dispersions in dwarf spheroidal galaxies. [ ] It cannot account for empirical relations like the Tully-Fisher relation. [ ] It cannot be tested or falsified by current or near-future experiments. [ ] Your claims are unfounded or exaggerated. 1. https://news.ycombinator.com/item?id=26633670 https://news.ycombinator.com/item?id=26633670
- whatshisface 2y ago>[ ] It introduces arbitrary parameters without physical justification. Every fundamental theory does this.
- marshray 2y agoAnd they come along about once in a century. Which doesn't make it wrong, but is it perhaps enough to call it an extraordinary claim?
- whatshisface 2y agoDark matter is one of the few things that has been studied enough for all of the ordinary explanations to have been ruled out.
- andrewflnr 2y ago> The new model is a hybrid model that combines the tired light (TL) theory with a variant of the ΛCDM model in which the cosmological constant is replaced with a covarying coupling constants' (CCC) parameter α. Are the dark-matter-phobes going to pretend this is "simpler" than dark matter w.r.t Occam's razor? I bet they are. Can't wait.
- stefantalpalaru 2y ago[dead]
- pdonis 2y ago"Tired light" has been debunked for decades. Unfortunately, phys.org articles are notorious for not pointing out things like this.
- andrewflnr 2y agoThe whole article just accepts the paper as gospel. I've noticed this as a problem with lots of science reporting, where the latest paper or whatever completely supersedes all previous research. Sometimes even, as in this case, when the latest paper is just written by some rando with an axe to grind.
- imglorp 2y agoTired light has been retired ... https://www.science.org/content/article/tired-light-hypothesis-gets-re-tired https://www.science.org/content/article/tired-light-hypothes...
- MarcoZavala 2y ago[dead]
- perihelions 2y agoMore comments here (it's the same paper): https://news.ycombinator.com/item?id=39742010 https://news.ycombinator.com/item?id=39742010 ("Hypothesis That Universe Has No Dark Matter and Is 27B Years Old"; 71 comments)
- mattmaroon 2y agoDark matter to me seems a lot like the ether. Our understanding is wrong and we don’t know how or why so we invented a fudge factor to explain it. One day people will think we were silly to believe it.
- Log_out_ 2y agoBut today we measure little to fail theories early and fail them loud.Instead endless mathturbation.