Eise Posted November 23, 2017 Share Posted November 23, 2017 At least not according André Maeder, University of Geneva: Quote The consensus at present is that of a Big Bang followed by expansion. "In this model, there is a starting hypothesis that hasn't been taken into account, in my opinion," says André Maeder, honorary professor in the Department of Astronomy in UNIGE's Faculty of Science. "By that, I mean the scale invariance of empty space; in other words, empty space and its properties do not change following a dilatation or contraction." (...) When Maeder carried out cosmological tests on his new model, he found that it matched observations. He also found that the model predicts the accelerated expansion of the universe without having to factor in dark energy. In short, it appears that dark energy may not actually exist since the acceleration of the expansion is contained in the equations of the physics.In a second stage, Maeder focused on Newton's law, a specific instance of the equations of general relativity. The law is also slightly modified when the model incorporates Maeder's new hypothesis. Indeed, it contains a very small outward acceleration term, which is particularly significant at low densities. This amended law, when applied to clusters of galaxies, leads to masses of clusters in line with that of visible matter (contrary to what Zwicky argued in 1933). This means that no dark matter is needed to explain the high speeds of the galaxies in the clusters. Interesting. Let's wait and see. 2 Link to comment Share on other sites More sharing options...
swansont Posted November 23, 2017 Share Posted November 23, 2017 Sean Carroll has commented that we need to see if it replicates the CMB anisotropies. The stumbling block of other alternate models is they replicate one behavior of dark matter, but not others. Link to comment Share on other sites More sharing options...
LaurieAG Posted November 24, 2017 Share Posted November 24, 2017 The paper is interesting. https://arxiv.org/abs/1710.11425 Link to comment Share on other sites More sharing options...
J.C.MacSwell Posted November 24, 2017 Share Posted November 24, 2017 It assumes the "scale invariance of empty space". What is the current model based on? Have there been some effects assumed to be present due to the expansion? What are they with respect to empty space? Or am I misinterpreting? Link to comment Share on other sites More sharing options...
Strange Posted November 29, 2017 Share Posted November 29, 2017 A bit of commentary on this: https://gizmodo.com/dark-matter-is-not-dead-1820809277/amp Link to comment Share on other sites More sharing options...
Eise Posted November 30, 2017 Author Share Posted November 30, 2017 On 29/11/2017 at 1:58 PM, Strange said: A bit of commentary on this: https://gizmodo.com/dark-matter-is-not-dead-1820809277/amp That is a pretty devastating critique. I looked up Maeder's background before I posted this, he seemed a kind of authority. So I didn't have to wait very long... Thanks for the link. Link to comment Share on other sites More sharing options...
Strange Posted December 5, 2017 Share Posted December 5, 2017 Another blog post about this paper: http://backreaction.blogspot.co.uk/2017/11/astrophysicist-discovers-yet-another.html Maeder himself posts some comments below the article. Link to comment Share on other sites More sharing options...
Eise Posted December 6, 2017 Author Share Posted December 6, 2017 Thanks, Strange. Maeder does not give up.... I also saw (negative) comments of John Baez. Now I'll wait till we have found what DM really exists of. WIMPS, brown dwarfs, planets without stars, (primordial) black holes .... Link to comment Share on other sites More sharing options...
Bill Angel Posted December 6, 2017 Share Posted December 6, 2017 Interesting article for the non specialist reader: "Study finds 'dark matter' and 'dark energy' may not exist – here's what to make of it" — http://theconversation.com/study-finds-dark-matter-and-dark-energy-may-not-exist-heres-what-to-make-of-it-88181 What is worth mentioning is that the authors' theory and its confirmation by astronomical observations only deals with the rotational motion of galaxies, but makes no mention of the observations of "gravitational lensing" which result in the light from distant galaxies being bent when it passes near galaxies that are closer to the Earth. "Gravitational lensing" would seem to be the more direct evidence for the existence of dark matter. Link to comment Share on other sites More sharing options...
Mordred Posted December 7, 2017 Share Posted December 7, 2017 you might want to read this http://backreaction.blogspot.ca/2017/11/astrophysicist-discovers-yet-another.html In essence their is numerous errors in his paper 1 Link to comment Share on other sites More sharing options...
swansont Posted December 7, 2017 Share Posted December 7, 2017 ! Moderator Note Similar threads merged Link to comment Share on other sites More sharing options...
interested Posted December 15, 2017 Share Posted December 15, 2017 I think this should go here Mathematicians claim dark matter and an accelerating universe is to be expected from einsteins original equations. Doing without dark energy: Mathematicians propose alternative explanation for cosmic acceleration https://phys.org/news/2017-12-dark-energy-mathematicians-alternative-explanation.html?utm_source=nwletter&utm_medium=email&utm_campaign=daily-nwletter Link to comment Share on other sites More sharing options...
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