Untitled episode

foreign you say that dark matter doesn't exist run out falsification is the key words you test the one Theory Dark Matter exists tested is falsified with more than five Sigma it doesn't exist you drop it you don't even touch it anymore ever in Armada search troop group we do not touch dark matter anymore right Jessica disagree on that come in and try to explain why we

haven't all stopped working on dark matter I think within the Dark Matter model the reason we haven't just all said well okay this is just inconsistent we're going to stop working on it is that it's really quite a complicated question how fast Galaxy should be moving and the Dark Matter model has been so successful at explaining other observations that I really think we should just be

working on both um you know I think having some people working on dark matter and some people working on modified gravity is probably a reasonable Division I might interject here because I hear the statement many times that the Dark Matter models of course the cosmological Dark Matter models have been successful in accounting of a large variety of observations it is wrong I don't know any single

observation which has actually been successfully reproduced by by the Dark Matter models one case if you look at the account the number of galaxies within our surroundings you go out to hundreds of millions of light years you can count the number of galaxies per unit space you have right and we see that the density of matter increases out to um about um 1500 million light years

so that's already a large distance um and um which means we live in a gigantic under density this is called the KBC void which was discovered by Keenan bag and Kobe in 2012 and it's been verified by subsequent studies also looking at the number of Galaxy clusters we believe in a region of cosmological space which has a lower mass density a smaller number of Galaxy clusters

smaller number of galaxies than further out now that huge and void is completely inconsistent with the Lambda CDM model there have been you know some things there are predictions in the more normal sense um so for example if Dark Matter exists and Einstein's theory of general relativity is broadly speaking correct even at large scales than we would expect to observe um the bending of light around

dark matter this is called gravitational lensing and then you know indeed we have observed that so there are some things where you can kind of make predictions and see them but with a lot of science these days and particularly a lot of fundamental physics there's so much input that needs to go into every calculation you have to make so many assumptions and everyone has to do

that we have to do it you have to do it if you're calculating and modify gravity you have to do that to calculate anything that it can be quite hard to disentangle exactly what's the prediction and what's just consistency within the theory there's a very beautiful test which falsifies the Dark Matter existence with more than 12 Sigma confidence and that's a Galaxy's built up bars in

the center so the whole this galaxy is becomes that a little bit unstable and it forms a bar like structure if you look at pictures of galaxies you can see the round this galaxy the spiral patterns and there's a bar in many of them yeah now this bar is a solid Rotator it can it has to be a solid rotating structure otherwise it wouldn't be a

bar it's not a spiral pattern this structure is a huge amount of mass which actually moves around like a spoon in coffee and it hits up the Dark Matter hell around it in that theory and therefore it slows down because it gives its up its moving energy to the dark matter which absorbs it and the Dark Matter Halos puffs up a little bit that slow down

is radically not seen in the data it's 12 Sigma which is much much more than five Sigma totally not there in the data this is why I'm so completely confident there is no dark matter I mean as a scientist I would be ruining my reputation if I would be climbing around in the um in the landscape there is no dark matter where my colleague next door

a famous Professor tells me there is dark matter but I have to follow the scientific evidence which tells me there is absolutely no dark matter the podcast talks debates courses and articles visit the Institutes of Art and ideas click the link on screen now to IAI dot TV