tag:blogger.com,1999:blog-4637778157419388168.post541698208776518651..comments2024-03-21T09:01:08.175-07:00Comments on Physics with an edge: Dragonfly 44: a fudge too far.Mike McCullochhttp://www.blogger.com/profile/00985573443686082382noreply@blogger.comBlogger14125tag:blogger.com,1999:blog-4637778157419388168.post-76651525776844186242016-12-17T15:47:03.129-08:002016-12-17T15:47:03.129-08:00My suspicion is similar, because the Unruh radiati...My suspicion is similar, because the Unruh radiation is luminal in essence, so it cannot be applied as a causual explanation of anything at the cosmological scales. This still doesn't mean, that your work has no practical merit, but I would reconsider its physical intepretation for to avoid the epicycle glitch: the numeric agreement of explanation with reality still doesn't means, that the reality works according to this agreement, once the observational perspective gets inverted.<br /><br />https://www.reddit.com/r/Physics_AWT/comments/5f1f1c/nasas_em_drive_paper_is_officially_published_at/db4lji4/Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-74195575622976098602016-09-11T01:48:33.652-07:002016-09-11T01:48:33.652-07:00Your MiHsC says this, and MiHsC says that. All der...Your MiHsC says this, and MiHsC says that. All derived from Unruh effect and "Hubble scale Casimir effect" (whatever balooney that is)<br /><br />Let me only say this: I suspect that you do not understand what Unruh effect actually is, what it predicts and what the scale of the phenomenon (if ever observed) would be.tyyhttps://www.blogger.com/profile/05296030725193206870noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-56465584333450866512016-09-06T17:13:06.244-07:002016-09-06T17:13:06.244-07:00@Analytic D
Thanks, I thought it would be somethi...@Analytic D<br /><br />Thanks, I thought it would be something like that. I mean, it would make sense that light bent by gravity would follow the same rules as mass. I just don't have enough of a feel for it to be sure of my guesses.benjaminhttps://www.blogger.com/profile/16312179400254630926noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-49495727090671586352016-09-06T00:17:51.827-07:002016-09-06T00:17:51.827-07:00@benjamin
You just need behavior that affects lig...@benjamin<br /><br />You just need behavior that affects light like GR mass affects light. Horizon mechanics definitely leave room for such behavior.Analytic Dhttps://www.blogger.com/profile/14307179997233629815noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-30083092697155644262016-09-04T09:49:17.922-07:002016-09-04T09:49:17.922-07:00qraal: I'm very happy that Cannae are doing th...qraal: I'm very happy that Cannae are doing this crucial experiment. Good luck to them! I need to know their specifications so I can make a prediction.Mike McCullochhttps://www.blogger.com/profile/00985573443686082382noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-52929849315157163242016-09-03T14:25:35.071-07:002016-09-03T14:25:35.071-07:00Hey Mike,
Cannae are launching a CubeSat test of t...Hey Mike,<br />Cannae are launching a CubeSat test of their thruster, which is a variation on the EM Drive. We might see some slam-dunk verification of your theory before too long :-)qraalhttps://www.blogger.com/profile/13436948899560519608noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-24403241348671012262016-08-31T16:07:17.277-07:002016-08-31T16:07:17.277-07:00Hello Mike,
I was wondering if you had any recent...Hello Mike,<br /><br />I was wondering if you had any recent results to share about gravitational lensing effects. I note that you had a post a while ago about your thoughts on this, but I didn't see anything recently. I ask, because I'd seen this category of evidence (Bullet Cluster and others) cited as a real knock-down argument in favour of the presence of true mass, and therefore for dark matter or something like it. I'm just an interested layman, so I can't really evaluate how strong this argument is (nor can I work out what might be the implications of MiHsC for galactic-scale deflection of light, hah.)benjaminhttps://www.blogger.com/profile/16312179400254630926noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-42648495102154408132016-08-27T22:17:50.626-07:002016-08-27T22:17:50.626-07:00/* but I can't understand your objection. I ca.../* but I can't understand your objection. I can assume there is no dark matter */<br /><br />Under situation, when we don't understand (or at least intersubjectively accept) the nature of dark matter, then the "dark matter" denomination serves as a phenomenological description of all observations, which don't fulfill the established theories at astronomic scales. <br /><br />This doesn't imply, that the dark matter is actually formed with some massive particles or just field. In reality it can be formed with something inbetween or it may be of composite character - which would mean, many particular theories may be applicable here at the same moment in some mixing ratio.<br /><br />For me it just seems, that the MiHsC is more advanced than MoND in this moment, but because both model depend on relativity, they both don't work well until the dark matter is forming filaments (sparse cold dark matter scenario for spherically asymmetric solutions) or it exhibits cohesive properties (which is the case of Bullet cluster or let say Dragonfly 44 galaxy, i.e. the case of hot dark matter). The both apply to warm dark matter scenarios at best.Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-82384471585065382692016-08-27T22:06:36.583-07:002016-08-27T22:06:36.583-07:00/* but you have to suggest a mechanism to explain .../* but you have to suggest a mechanism to explain why */<br /><br />It just follows from the above product of Hubble constant and speed of light - or not? The anomalous deceleration of Pioneer spaceprobes can be explained in just the way, the light exchanged between Earth and spaceprobe isn't able to measure with expanding space between them. In dense aether model the space-time expansion is virtual result of light scattering with the quantum field (density fluctuations of vacuum responsible for (isotropic) CMB noise), which also explains the deeper connection of MoND and MiHsC theories. That is to say, I'm not serving as an advocate of any theory here - I just want to understand their both strong, both weak features, i.e. both common aspects, both mutual inconsistencies.Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-68712533509136339712016-08-27T14:16:51.009-07:002016-08-27T14:16:51.009-07:00Let me put it this way: How would you feel about E...Let me put it this way: How would you feel about Einstein's theories if, instead of E=mc^2 he'd come up with E=1.578mc^2 and said 'well, 1.578 is of the order of pi'?Mike McCullochhttps://www.blogger.com/profile/00985573443686082382noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-51341285727522688932016-08-27T13:50:47.566-07:002016-08-27T13:50:47.566-07:00There is maybe a language barrier, but I can't...There is maybe a language barrier, but I can't understand your objection. I can assume there is no dark matter. Also, MoND's a0 was determined empirically by comparing to galaxies. It's easy then to say: 'it's in the ballpark of cosmic acceleration', but you have to suggest a mechanism to explain why, otherwise you don't know anything and it could be a coincidence. MiHsC does suggest a mechanism and MoND never successfully did: Milgom rejected Unruh radiation as being isotropic. Once you have such a mechanism, MiHsC, then you can predict many things in other regimes, such cosmic acceleration, the flyby anomaly, the emdrive the proton radius that MoND can not. Physics needs to have exact mechanisms, not empirical formulae, otherwise it is just engineering and not predictive beyond a narrow range.Mike McCullochhttps://www.blogger.com/profile/00985573443686082382noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-32438490571472595952016-08-27T13:30:36.847-07:002016-08-27T13:30:36.847-07:00Well, it didn't help very much... Now I'm ...Well, it didn't help very much... Now I'm talking about amount of DM like about amount of artifacts, which violate the general relativity (like the anomalous lensing or momentum connected with anomalous velocity curves). I don't ask about its physical origin at all in this moment.<br /><br />But once we have dark matter without observable one, then all theories which are relying on modification of relativity with changing physics (with ad-hoced parameters or without them) get doomed with no mercy. BTW the MoND theory parameter is not so ad-hoced as you may think, as the acceleration parameter a0 can be estimated easily as the product of Hubble constant and speed of light, i.e. the result of omnidirectional expansion of space-time.Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-26297164280179160792016-08-27T12:49:10.136-07:002016-08-27T12:49:10.136-07:00I'm glad you asked that: I'm afraid you...I'm glad you asked that: I'm afraid you've misunderstood. Firstly they do not predict dark matter (DM) at all, they change the physics instead. Secondly they do not predict a fixed 'apparent' ratio of VisibleM/DM, the 'apparent fraction' of DM increases with M, but again it is the physics that is changing. Thirdly, MoND has a 'problem' in that the fitting parameter a0 is empirical and unexplained and that is unsatisfactory, but MiHsC has no such problem. Hope that helps..Mike McCullochhttps://www.blogger.com/profile/00985573443686082382noreply@blogger.comtag:blogger.com,1999:blog-4637778157419388168.post-54942028868532620982016-08-27T11:06:18.338-07:002016-08-27T11:06:18.338-07:00If I understand it well, the problem of MoND / MiH...If I understand it well, the problem of MoND / MiHsC just is, they predict fixed ratio of visible/dark matter? Fortunately the calculation of baryonic mass in Dragonfly 44 is based entirely on the luminosity of the galaxy, so it's premature to say its mass is almost entirely made of dark matter.Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.com