tag:blogger.com,1999:blog-22973357.post708525117831166558..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Have we really measured gravitational waves?Sabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger169125tag:blogger.com,1999:blog-22973357.post-58512751064014269072020-01-31T10:11:32.292-05:002020-01-31T10:11:32.292-05:00More robust detection of gravitational wave radiat...More robust detection of gravitational wave radiation is surely a worthy goal, something worth spending a tiny fraction of the $$ the various next-gen colliders would cost (comment re size of investment only).<br /><br />Enter Adhikari+ (2020) "A Cryogenic Silicon Interferometer for Gravitational-wave Detection" (link: https://arxiv.org/abs/2001.11173). A sentence from the abstract: &JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-67116544355606972072020-01-02T07:14:28.861-05:002020-01-02T07:14:28.861-05:00Can anyone explain why most gravitational wave det...Can anyone explain why most gravitational wave detections are within 2 days of New or Full Moon. Coming from gazillion light years away they arrive to Earth within 43 hours of New or Full Moon. Jackhttps://www.blogger.com/profile/05199439262657432302noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-28499074280031345052019-12-11T00:50:29.312-05:002019-12-11T00:50:29.312-05:00"Gravitational waves are periodic deformation..."Gravitational waves are periodic deformations of space and time" -- Is it possible that these omnipresent spacetime deformations (with very high frequencies) are the cause of all quantum effects including uncertainty principle and wave–particle duality?Alexhttps://www.blogger.com/profile/16716563350465238544noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-76671642815044137422019-12-05T14:17:16.277-05:002019-12-05T14:17:16.277-05:00bud rap, I am not well today, so what I write may ...bud rap, I am not well today, so what I write may be ~nonsense.<br /><br />A big problem with addressing "discordant redshifts" is what, in detail, do you mean.<br /><br />It's pretty easy to find papers which address one or another aspect. Here are two which I regard as showing that at least some Arpian ideas are very much inconsistent with observations:<br /><br />Repin+ (2010) JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-35621196219808915992019-12-05T11:31:43.631-05:002019-12-05T11:31:43.631-05:00Jean,
Sorry about the slow response, I've bee...Jean,<br /><br />Sorry about the slow response, I've been travelling and wanted to give the Bill Keel page proper attention. What I found was a good, open-minded assessment of the pros and cons of the issue, even though Keel, himself, favors the standard interpretation. But that means that the page does not support your stated conclusion that <i>...his "discordant redshift" ideas bud raphttps://www.blogger.com/profile/06948881286545517324noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-40391301488731300092019-11-30T13:41:15.000-05:002019-11-30T13:41:15.000-05:00bud rap,
How about veteran astronomer Bill Keel?
...bud rap,<br /><br />How about veteran astronomer Bill Keel?<br /><br />Alternate Approaches and the Redshift Controversy<br />http://pages.astronomy.ua.edu/keel/galaxies/arp.html<br /><br />How about a catalog of almost 2000 discordant redshift systems (the paper describing it is by Bill Keel):<br />https://data.galaxyzoo.org/overlaps.html<br /><br />What are "<i>AGN-quasar alignments</i>&JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-14962345310360747802019-11-30T01:56:20.498-05:002019-11-30T01:56:20.498-05:00Sabine wrote: The first direct detection of gravi...Sabine wrote: <i>The first direct detection of gravitational waves was made by the LIGO collaboration in September 2015... This first signal measured by LIGO looks like a textbook example of a gravitational wave signal from a merger of two black holes.</i><br /><br />As I recall, the original gravitational wave detection in 2015 was attributed to the merger of two black holes of masses 29 and 36DanCohttps://www.blogger.com/profile/17208118816000864783noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-8953746838075226412019-11-29T09:36:21.101-05:002019-11-29T09:36:21.101-05:00Jean,
Well, I suppose a crank website devoted to ...Jean,<br /><br />Well, I suppose a crank website devoted to refuting "creationism in astronomy" is better than nothing. If that's the best you can come up with regarding a scientific treatment of discordant redshifts you're on shaky ground, but nevertheless...<br /><br />Let me just state what should be the obvious refutation of the lazy statistical argument presented. Granting bud raphttps://www.blogger.com/profile/06948881286545517324noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-55702054982324917662019-11-28T15:28:36.652-05:002019-11-28T15:28:36.652-05:00Somewhat OT to GWR, LIGO, etc. The distribution of...Somewhat OT to GWR, LIGO, etc. The distribution of (astronomical) sources on the sky has come up in at least two comments, by Matti (directly) and by bud rep (indirectly). In the words of a source bud rep cited:<br />"<i>we assume that the background/foreground objects are distributed according to a Poissonian distribution with the average density in any line of sight.</i>"<br /><br />JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-29167002114899765852019-11-26T15:01:03.192-05:002019-11-26T15:01:03.192-05:00bud rap: I have participated in many online forum ...bud rap: I have participated in many online forum discussions on the topic of Arp's discordant redshifts. As a citizen scientist engaged in the Galaxy Zoo project, I found dozens of them (all are chance alignments, or cosmic coincidences). No proponent of "discordant redshifts" has been able to present a cogent case for their existence. Tom Bridgman studied this topic in four blog JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-42786643291324605062019-11-24T23:13:29.976-05:002019-11-24T23:13:29.976-05:00Jean,
For the record, I didn't ask you to dis...Jean,<br /><br />For the record, I didn't ask you to discuss the Corredoira paper, I asked you to cite something in support of your casual assertion that the the discordant redshift issue has "bitten the dust". Your response, as usual, is to change the subject. I've seen this diversionary digression tactic many times before. As we say in my country, that dog don't hunt.bud raphttps://www.blogger.com/profile/06948881286545517324noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-60893274996016410282019-11-22T14:10:07.785-05:002019-11-22T14:10:07.785-05:00"We don't do much disagree, as you refuse..."<i>We don't do much disagree, as you refuse to address the arguments.</i>" - that's what you wrote.<br /><br />Here's what I wrote (I added some bold): "<i>we are going to have to agree to disagree, <b>if only because the comments section of Sabine's blog is wholly inadequate for a decent discussion of this.</b></i>"<br /><br />To be clear, I'm happy to JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-51564249491188434772019-11-22T13:05:30.866-05:002019-11-22T13:05:30.866-05:00We don't do much disagree, as you refuse to ad...We don't do much disagree, as you refuse to address the arguments. You simply dismiss points of view with hand waving and snide comments.<br /><br />Stamp collecting isn't science but then neither are your interlocking set of empirically baseless beliefs that constitute LCDM.<br /><br />Having two sets of standards, one for your preferred model and a second for any evidence that bud raphttps://www.blogger.com/profile/06948881286545517324noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20625154446773042912019-11-22T10:16:17.802-05:002019-11-22T10:16:17.802-05:00@bud rap: we are going to have to agree to disagre...@bud rap: we are going to have to agree to disagree, if only because the comments section of Sabine's blog is wholly inadequate for a decent discussion of this.<br /><br />Facetiously, if you buy López-Corredoira&Gutiérrez (2005) I have a bridge to sell you. <br /><br />More seriously, Section 7 is woeful ... e.g. there are <b>more than</b> "<i>two possible interpretations of these JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-30763104117660465842019-11-21T13:25:10.647-05:002019-11-21T13:25:10.647-05:00...his "discordant redshift" ideas have ...<i>...his "discordant redshift" ideas have totally bitten the dust, in the light (ha!) of survey data.</i><br /><br />Spare me the hand waving - cite something that you consider a definitive refutation of the observed discordant redshifts. I've never seen anything more than lazy statistical arguments or gravitational lensing invocations that are overly generalized from individual bud raphttps://www.blogger.com/profile/06948881286545517324noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-57851094852493469702019-11-19T08:14:27.580-05:002019-11-19T08:14:27.580-05:00bud rap: Just two things:
Assuming you have no pr...bud rap: Just two things:<br /><br />Assuming you have no problems with observations that neutron star binary orbits are decaying, what - if anything - do you propose (or think) is the cause? And how do any such causes relate to General Relativity?<br /><br />Re Halton Arp: I can't do a "Senator, you're no Halton Arp" (we never met as far as I know), but I can decry your poor JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-20489826293061119632019-11-18T15:32:25.122-05:002019-11-18T15:32:25.122-05:00Jean Tate,
There is no compelling scientific logi...Jean Tate,<br /><br />There is no compelling scientific logic evident in your remarks; it is all hand waving and special pleading. Sure we haven't found GWs despite 50 years of effort, you say, but give us more time and $$$ and someday we will deliver direct, empirical evidence for their existence.<br /><br />The problem being, of course, that you are chasing a dubious, objectively-failed bud raphttps://www.blogger.com/profile/06948881286545517324noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-27693113874562050162019-11-17T10:30:42.094-05:002019-11-17T10:30:42.094-05:00@bud rap: I think you are missing something pretty...@bud rap: I think you are missing something pretty big.<br /><br />"<i>That's right, and the number of GW detections from those binary pulsars = 0. If GWR is the mechanism for the observed decay, why can't LIGO detect it?</i>" I don't think anyone would, or could, seriously expect LIGO to detect any GWR, transient or not, from any of the binary pulsars (shorthand) that have JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-51921466237633700312019-11-16T15:10:12.755-05:002019-11-16T15:10:12.755-05:00Jean Tate,
Give me enough $$ and I'll build d...Jean Tate,<br /><br /><i>Give me enough $$ and I'll build detectors/instruments/telescopes/observatories which will have a look-see if there's anything like GWR (transients, continuous, whatever) and let you know what I find.</i><br /><br />This has been done for 50 years. Nothing of significance has been found with the possible exception of the shaky, and therefore hardly conclusive, bud raphttps://www.blogger.com/profile/06948881286545517324noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-7510467548811050012019-11-15T14:41:46.873-05:002019-11-15T14:41:46.873-05:00Thanks @bud rap and @Lawrence Crowell! :)
Seasone...Thanks @bud rap and @Lawrence Crowell! :)<br /><br />Seasoned astronomer's possible response: You guys who wrangle theories and equations have fun. Give me enough $$ and I'll build detectors/instruments/telescopes/observatories which will have a look-see if there's anything like GWR (transients, continuous, whatever) and let you know what I find. P.S. Check out the literature, there&#JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-19783361388838859772019-11-15T14:26:12.316-05:002019-11-15T14:26:12.316-05:00@Matti, re "We look at the sky a lot so we ca...@Matti, re "<i>We look at the sky a lot so we can calculate the probability of a coincident independently of the underlying distributions, which should be poisson. But what p value is good enough is kind of unrelated to my argument and up to each person.</i>"<br /><br />I think we are talking past each other, as the saying goes.<br /><br />What "coincidence" are we trying to JeanTatehttps://www.blogger.com/profile/08737430572613792118noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-31283552200930513802019-11-15T11:52:56.060-05:002019-11-15T11:52:56.060-05:00Lawrence,
As usual you are proffering an argument...Lawrence,<br /><br />As usual you are proffering an argument based on your mathematicist beliefs. Mathematicism, however, has no basis in science, nor is it logically sound. It is an unscientific belief system based on a poorly thought-out pseudo-philosophy, which nonetheless has become the operating paradigm of the fundamental-physics community. (https://en.wikipedia.org/wiki/Mathematicism)<br /bud raphttps://www.blogger.com/profile/06948881286545517324noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-25389021647673895942019-11-14T08:16:37.119-05:002019-11-14T08:16:37.119-05:00Lawrence Crowell: But if gravity is quantized, isn...Lawrence Crowell: But if gravity is quantized, isn't there some minimum value or strength of gravity that can be realized? <br /><br />So if gravity is quantized wouldn't gravity waves dissipate to nothing at some horizon distant from their causation?<br /><br />Likewise if space is quantized; there would be a minimum distance of movement as a result of a GW, space could only be warped inDr. A.M. Castaldohttps://www.blogger.com/profile/17988116835722393503noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-24887311807439759612019-11-14T07:17:40.200-05:002019-11-14T07:17:40.200-05:00Gravity waves exist in general relativity for much...Gravity waves exist in general relativity for much the same reason electromagnetic waves exist in Maxwell's theory. In a post-post-Newtonian expansion general relativity gives a Maxwell-like equation. The main difference is a factor of 2 that means these waves are generated by quadrupole moments and not dipole. A dipole moment in GR would violate momentum conservation.<br /><br />Look on Lawrence Crowellhttps://www.blogger.com/profile/12090839464038445335noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-8869592286614591242019-11-14T00:21:36.187-05:002019-11-14T00:21:36.187-05:00Jean Tate,
Searches for GWR other than LIGO etc: ...Jean Tate,<br /><br /><i>Searches for GWR other than LIGO etc: do you think eLISA (and similar) are the same, in that direct detection of GWR is impossible?</i><br /><br />It is a matter of basic logic that it is impossible to detect something that doesn't exist. Fifty years of negative empirical evidence strongly suggests that GWs don't exist, so yes, it will be impossible to detect thembud raphttps://www.blogger.com/profile/06948881286545517324noreply@blogger.com