Hello everyone! I just started my PHD at St Andrews & Im giving a lecture for your Physics Society on Friday. Itll be about why galaxies dont need dark matter. Ill be giving away a bottle of French wine for whoever first finishes a calculation that should take a few minutes. Date: Friday, 14th November, 2014 Time: 13:00 – 14:00 Venue: Room 5327, James Clerk Maxwell Building, Kings Buildings A Tale of Two Galaxies: Modified Gravity In Plane Sight? The satellite galaxies of the Milky Way and Andromeda mostly fall within thin planes. I will explain why this is unlikely in the standard cosmological paradigm. This theory is based on classical gravity being valid everywhere. However, the ultraweak gravity in the outskirts of galaxies means the quantised nature of gravity should become important. In such regions, one does in fact see a strong departure from the predictions of classical theories. If one is convinced of their validity in such regions, then one must add vast amounts of hypothetical dark matter to save the classical gravity theory. Moreover, dark matter in galaxies is increasingly unlikely given null results from the LHC and direct detection experiments. Obtaining the required distributions of dark matter from reasonable initial conditions also appears to be very unlikely. Thus, I will present a reasonable model for the satellite galaxies using an empirical acceleration-based modification to gravity, but without recourse to invisible matter. The failure of classical theories at very low energy densities is not very controversial in most other areas of physics. I will present a bottle of wine from France for an undergraduate who correctly answers a question I will ask during my lecture. If you dont win, you get second prize: a chance to calculate for yourself why the standard cosmological paradigm is unlikely to be correct.
Posted on: Mon, 10 Nov 2014 14:45:27 +0000
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