tag:blogger.com,1999:blog-22973357.post5169811482012641409..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Superfluid dark matter gets seriously into businessSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger58125tag:blogger.com,1999:blog-22973357.post-11909851897691836972019-09-21T13:10:58.336-04:002019-09-21T13:10:58.336-04:00hello, what would he the smoking gun signal for su...hello, what would he the smoking gun signal for superfluid dark matter?Geargohttps://www.blogger.com/profile/07617069917467447030noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-31952334076043652662018-09-19T07:57:25.498-04:002018-09-19T07:57:25.498-04:00James,
I don't know what that means/doesn'...James,<br /><br />I don't know what that means/doesn't parse. I don't think that in general it's thermalized, that would be quite surprising given that galaxies can collide. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-81241994778210066612018-09-19T06:40:18.218-04:002018-09-19T06:40:18.218-04:00Sabine,
Are you thinking that the dark matter supe...Sabine,<br />Are you thinking that the dark matter superfluid thermalizes into motion?Anonymoushttps://www.blogger.com/profile/18392738374339279149noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-73282931622014263042018-02-06T05:19:51.610-05:002018-02-06T05:19:51.610-05:00Vincent,
Dark matter is a superfluid that fills &...Vincent,<br /><br />Dark matter is a superfluid that fills 'empty' space. The bullet cluster is analogous to boats moving through and displacing the water. As the boats pass by each other closely their bow waves pile up and then slosh back out. This is what occurs as the galaxy clusters pass by each other.<br /><br />https://www.nasa.gov/mission_pages/hubble/news/Tom Westborohttps://www.blogger.com/profile/15531969067709843682noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-11727126189713792802018-02-06T01:15:52.597-05:002018-02-06T01:15:52.597-05:00Vincent,
The Bullet Cluster is a statistical outl...Vincent,<br /><br />The Bullet Cluster is a statistical outlier. It's a system strongly out-of-equilibrium and a challenge to explain with any theory, especially with cold dark matter. <a href="http://backreaction.blogspot.de/2017/01/the-bullet-cluster-as-evidence-against.html" rel="nofollow">I wrote about this here</a>. I am sure sooner or later there will be numerical simulations to check Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-25892814752358325272018-02-05T17:35:25.657-05:002018-02-05T17:35:25.657-05:00Any idea how well this idea is compatible with our...Any idea how well this idea is compatible with our observations of the Bullet Cluster? That's a particularly interesting case, because it implies a very specific and strongly non-symmetrical distribution of the dark matter, unlike the rotation patterns in most galaxies.Anonymoushttps://www.blogger.com/profile/18312166792759529390noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-77861946264947577902018-01-17T12:05:42.392-05:002018-01-17T12:05:42.392-05:00neo,
No, the standard model neutrinos can't c...neo,<br /><br />No, the standard model neutrinos can't condense - they have no interaction that is strong enough to enable this. They don't hold together, basically. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-24712814772551514072018-01-17T11:13:10.444-05:002018-01-17T11:13:10.444-05:00can standard model neutrinos fit the bill of a dar...can standard model neutrinos fit the bill of a dark matter super fluid?<br /><br />neutrinos we know exist. <br /><br />can they condense and form a super fluidneohttps://www.blogger.com/profile/17318664916557810347noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-76827674719130653352018-01-16T01:41:22.568-05:002018-01-16T01:41:22.568-05:00Mozibur,
It's not 'gravity that can be se...Mozibur,<br /><br />It's not 'gravity that can be seen as a fluid'. It turns out that the laws of gravity have certain analogies to the laws of fluid dynamics. Yes, fluids also obey the laws of fluid dynamics, but it's not very surprising, is it?Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-11249857086383544512018-01-16T01:39:54.247-05:002018-01-16T01:39:54.247-05:00Stuart,
You are making pretty big claims there, b...Stuart,<br /><br />You are making pretty big claims there, but only showing that you don't understand much about effective theory. Since you spit such big words, saying you know all that's supposedly wrong with the idea, I am sure it occurred to you to read the paper.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-7837542476133958882018-01-16T01:19:35.645-05:002018-01-16T01:19:35.645-05:00If gravity can be seen as a fluid, then what about...If gravity can be seen as a fluid, then what about the other forces? Can they be too? Then does this mean that we have a new spin on Thales maxim 'that all is water'?Shohidur Rahmanhttps://www.blogger.com/profile/09704311381723915945noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20405105030337426972018-01-15T15:23:30.915-05:002018-01-15T15:23:30.915-05:00Are you suggesting that stars are encapsulated in ...Are you suggesting that stars are encapsulated in a bubble of dark matter gas surrounded by a superfluid? If so , we know what happens to gas bubbles in a liquid; they simply bubble out of the liquid and therefore leaving the galaxy devoid of stars. Stuart https://www.blogger.com/profile/12767480095489975264noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-44419497725668193412018-01-15T15:11:39.673-05:002018-01-15T15:11:39.673-05:00"In solar systems, for example, the density o..."In solar systems, for example, the density of (normal) matter is strongly peaked and the gradient of the gravitational field near a sun is much larger than in a galaxy on the average. In this case, the coherence in the dark matter fluid is destroyed, which is why we do not observe effects of modified gravity in our solar system."<br />Your statement here implies that stars destroy the Stuart https://www.blogger.com/profile/12767480095489975264noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-49236082246526364512018-01-15T00:09:37.631-05:002018-01-15T00:09:37.631-05:00Tom,
Well, thanks for the references that support...Tom,<br /><br />Well, thanks for the references that support my argument, not yours. As I said, spacetime is not a superfluid in this model. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-61011582359589265142018-01-14T20:31:08.291-05:002018-01-14T20:31:08.291-05:00Sabine
Will the superfluid obey the Navier-Stokes...Sabine<br /><br />Will the superfluid obey the Navier-Stokes equations? Or will it follow the Ricci flow? Ricci flow models the curvature of manifolds like heat flow. Perelman used the Ricci flow to solve the Poincare conjecture. He proved that he can get rid of singularities in the manifold by a technique called Ricci flow with surgery. Singularities are precisely the problem of general Enricohttps://www.blogger.com/profile/11062542721973950650noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-32321924616029313242018-01-14T15:04:10.971-05:002018-01-14T15:04:10.971-05:00Sabine,
'Galaxies in a superfluid vortex — re...Sabine,<br /><br />'Galaxies in a superfluid vortex — rectifying dark matter models'<br />https://resonance.is/1826-2/<br /><br />"Bose-Einstein spacetime superfluid models"<br /><br />"postulating that our galaxy is spinning in a superfluid medium. Such a prediction and its corresponding supporting evidence is in strong corroboration with the Resonance Science Foundation Tom Westborohttps://www.blogger.com/profile/15531969067709843682noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-44529009959130588272018-01-14T14:03:53.943-05:002018-01-14T14:03:53.943-05:00Sabine,
'Hydrodynamics of Superfluid Quantum ...Sabine,<br /><br />'Hydrodynamics of Superfluid Quantum Space: de Broglie interpretation of the quantum mechanics'<br />Quantum Studies: Mathematics and Foundations, 2017<br />https://arxiv.org/abs/1707.08508<br /><br />"The ubiquitous ether coming from the ancient times up to middle of the twenty century is replaced by a superfluid quantum space."<br /><br />'If Spacetime Tom Westborohttps://www.blogger.com/profile/15531969067709843682noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-34196635453415121192018-01-14T12:59:00.325-05:002018-01-14T12:59:00.325-05:00Are what we would have previously deemed unbounded...Are what we would have previously deemed unbounded (unVirialized) galactic clusters Viralised with these superfluid dark matter fields? By which I really mean to ask, is it possible to explain these extra field/particle contribution effects to someone's whose humble depth of understanding stretches to conventional application of the Virial theorem to bounded systems? leemcjameshttps://www.blogger.com/profile/02361355053331325032noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-32903797525250535842018-01-14T12:32:37.882-05:002018-01-14T12:32:37.882-05:00Tom,
For all I can tell, you are just talking abo...Tom,<br /><br />For all I can tell, you are just talking about a fantasy. I will not approve further of your comments unless you come up with a journal publication to support your claims. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-78434920957337818752018-01-14T12:26:07.891-05:002018-01-14T12:26:07.891-05:00Sabine,
Another way to think of this is to realiz...Sabine,<br /><br />Another way to think of this is to realize the space-time fabric has mass. The state of displacement of the space-time fabric is curved space-time. The space-time fabric having mass and the dark matter filling 'empty' space are the same stuff.Tom Westborohttps://www.blogger.com/profile/15531969067709843682noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-85770065338082760502018-01-14T12:16:47.887-05:002018-01-14T12:16:47.887-05:00Unknown,
This a low-energy effective theory. No o...Unknown,<br /><br />This a low-energy effective theory. No one knows anything about its extrapolation to just after the big bang.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-39192605165236377422018-01-14T12:15:24.663-05:002018-01-14T12:15:24.663-05:00Tom,
The displacement of dark matter is not curve...Tom,<br /><br />The displacement of dark matter is not curved spacetime, the displacement caused by matter gives rise to what we call dark matter. You still need a fundamental spacetime to start with. You merely get an effective metric on it. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-42410267944439737032018-01-14T09:24:51.943-05:002018-01-14T09:24:51.943-05:00The particles in this theory are very light. Coul...The particles in this theory are very light. Could they decay slowly over time producing the ultraviolet electromagnetic radiation that caused the re-ionization of the universe after the recombination that followed the big bang?Unknownhttps://www.blogger.com/profile/08363770435343791235noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47054789613895974182018-01-14T07:44:00.496-05:002018-01-14T07:44:00.496-05:00Sabine,
You are so close to putting it all togeth...Sabine,<br /><br />You are so close to putting it all together. You just need to take the superfluid analogy to its correct conclusion.<br /><br />Dark matter fills 'empty' space and is displaced by ordinary matter. The state of displacement of the dark matter IS curved spacetime.<br /><br />You'll get there and when you do you will be the first physicist to have done so.<br /><br />Tom Westborohttps://www.blogger.com/profile/15531969067709843682noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-28305435410942048922018-01-14T03:53:12.793-05:002018-01-14T03:53:12.793-05:00naive theorist,
I don't think it's up to ...naive theorist,<br /><br />I don't think it's up to me to judge how I appear to other people. I strive to express myself clearly. The intention of my writing is usually to communicate information. Of course that might not always and for everyone work as intended. <br /><br />I don't write a lot about my private life, not here and not elsewhere, and I am unsocial to the point of comingSabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.com