tag:blogger.com,1999:blog-22973357.post6368182356907603392..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: If it quacks like a black holeSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger83125tag:blogger.com,1999:blog-22973357.post-2010631939186052572016-05-14T07:00:59.538-04:002016-05-14T07:00:59.538-04:00@Phillip Helbig :
Concerning the work of Joy Chr...@Phillip Helbig : <br /><br />Concerning the work of Joy Christian (Research Physicist at the University of Oxford, Ph.D. in Foundations of Quantum Theory 1991,Boston University)<br /><br /><br /><br />I was pleased to read you took an interest in his work.<br /><br />If you are indeed looking for support on his work by physicists with authority, then I have found that one of his papers Koenraad Van Spaendonckhttps://www.blogger.com/profile/15090279727324831109noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47506471721902333752016-05-14T06:59:21.091-04:002016-05-14T06:59:21.091-04:00@Phillip Helbig :
Concerning the work of Joy Chr...@Phillip Helbig : <br /><br />Concerning the work of Joy Christian (Research Physicist at the University of Oxford, Ph.D. in Foundations of Quantum Theory 1991,Boston University)<br /><br /><br /><br />I was pleased to read you took an interest in his work.<br /><br />If you are indeed looking for support on his work by physicists with authority, then I have found that one of his papers Koenraad Van Spaendonckhttps://www.blogger.com/profile/15090279727324831109noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-21426756221218345742014-05-16T13:08:49.496-04:002014-05-16T13:08:49.496-04:00
Is there a possibility for a black hole to be an ...<br />Is there a possibility for a black hole to be an object that is simply moving or, in the case of a planetary black hole, rotating faster than the speed of light? There are a couple of lines of thought or questions that this would bring up but let’s start with what if faster than light motion were possible. <br /><br />What would an object look like if it were rotating at a speed faster Star Gazerhttps://www.blogger.com/profile/01690716234454372708noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-89176986805917895142014-04-09T04:31:12.086-04:002014-04-09T04:31:12.086-04:00Congratulations on being the "interviewed exp...Congratulations on being the "interviewed expert" on this topic for Bild der Wissenschaft!<br />Phillip Helbighttps://www.blogger.com/profile/12067585245603436809noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-59014249480423006692014-02-13T07:33:14.318-05:002014-02-13T07:33:14.318-05:00Jay,
Yes, photons and gravitons. I think it's...Jay,<br /><br />Yes, photons and gravitons. I think it's mostly gravitons (more polarizations, larger phase-space). I believe supermassive black holes are presently colder than the CMB so they don't evaporate anyway. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-43711525688721565682014-02-12T13:44:52.923-05:002014-02-12T13:44:52.923-05:00Is there some massless particle other than photon ...Is there some massless particle other than photon that is a candidate here? Gravitons perhaps? Or could we set up a device looking for radio waves with a 4 trillion meter wavelength coming from Sgr A* ?Jay Crosshttps://www.blogger.com/profile/04624503058819968929noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-17015112958236254772014-02-12T07:15:24.307-05:002014-02-12T07:15:24.307-05:00Jay,
Well, and then there's massless particle...Jay,<br /><br />Well, and then there's massless particles. Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-38638354379515047472014-02-12T06:02:13.452-05:002014-02-12T06:02:13.452-05:00Birrell & Davies finally arrived. Thanks! You ...Birrell & Davies finally arrived. Thanks! You are probably aware that the last word on the top line of your suggested page 269 is "backreaction". Nice. <br /><br />So now I'm left with another thing to wonder about. If the non-massless particles being emitted have a wavelength about equal to the diameter (radius?) of the black hole, then the particles being released by the most Jay Crosshttps://www.blogger.com/profile/04624503058819968929noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-58594933607479881812014-02-12T06:01:08.152-05:002014-02-12T06:01:08.152-05:00This comment has been removed by the author.Jay Crosshttps://www.blogger.com/profile/04624503058819968929noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-25380235016582780792014-02-08T03:15:35.179-05:002014-02-08T03:15:35.179-05:00Thanks for the answer!Thanks for the answer!Nirmalyahttps://www.blogger.com/profile/00482736027241310182noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-61320491093133799112014-02-07T02:01:47.424-05:002014-02-07T02:01:47.424-05:00Nirmalya,
It's a dimensional argument. Quantu...Nirmalya,<br /><br />It's a dimensional argument. Quantum gravitational corrections should become important when the curvature comes into the regime R \sim m_p^2, where m_p is the Planck mass. You can see that just by looking at the coupling in the perturbative limit. Nothing should happen before that. Or let me put it this way: If you want something to happen at smaller curvature, you have Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-105963746033925972014-02-07T01:58:42.026-05:002014-02-07T01:58:42.026-05:00HoPpeR©,
Sorry to hear, I feel your pain... Inste...HoPpeR©,<br /><br />Sorry to hear, I feel your pain... Instead of news magazines or papers, you can try to collect news from some institutes or professional societies - every place that doesn't live from making money with their news. They are normally much more accurate, though also a little slower in their reporting. In Physics eg, Physics Today and Physics World one can typically rely on (Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-91980278521710139222014-02-07T00:25:47.351-05:002014-02-07T00:25:47.351-05:00There's something related that I'm confuse...There's something related that I'm confused about. Solutions to the paradox where GR is modified at low curvatures are criticized and it is said that at that scale one does not expect quantum modifications to play a role. I'm a little confused about the basis of this expectation.Nirmalyahttps://www.blogger.com/profile/00482736027241310182noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-4719546034191536152014-02-06T16:58:50.752-05:002014-02-06T16:58:50.752-05:00I'm a layman but have a better than average la...I'm a layman but have a better than average layman's understanding of black holes and science in general because I read as much as I can about anything and everything I can. When I read some science news article about "Hawking says black holes do not exist" I immediately went looking to see how this writer could have twisted something Hawking had said into this. I did not take HoPpeR©https://www.blogger.com/profile/10454382097103899243noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-60150205022337048012014-02-06T01:33:17.462-05:002014-02-06T01:33:17.462-05:00Luca,
Thanks for letting me know about the funny ...Luca,<br /><br />Thanks for letting me know about the funny bio... I didn't write that and I didn't know about it till now. To begin with, Nordita is not a teaching institution. It is correct of course that I'm "interested" in string theory, but it's a passive interest and I don't normally list it among my research interests. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-77511672515835288962014-02-05T07:54:32.657-05:002014-02-05T07:54:32.657-05:00Philip,
I personally have examined each and every...Philip,<br /><br />I personally have examined each and every one of Joy's claims and the mathematics that support them. I have read the criticisms and the refutations. I have found the criticisms wanting and the refutations sound.<br /><br />If others have not done the same, they should not, as a matter of moral correctness and intellectual integrity, reject his research on the basis that at h rayhttps://www.blogger.com/profile/00150085167540063914noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-8885482724772535632014-02-04T11:43:18.955-05:002014-02-04T11:43:18.955-05:00That's a caricature of my question. Someone n...That's a caricature of my question. Someone not previously associated with Joy would not be within his circle, even if he agrees. So, I'm wondering whether there is anyone other than people who post comments on blogs saying that Joy is right but otherwise are not well known in the physics community who think that he has found something profound. Note that whether he is right or wrong Phillip Helbighttps://www.blogger.com/profile/12067585245603436809noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-83902342902489876752014-02-04T10:55:40.174-05:002014-02-04T10:55:40.174-05:00What qualifies as evading the question, Philip? I...What qualifies as evading the question, Philip? If anyone agrees with Joy, he is "inside Joy's circle" and so not qualified to judge the validity of his work. If anyone outside the circle makes a negative judgment, and is reasonably well known in what you deem the physics community, then you accept that judgment. So your criterion for judgment rests on authority, no matter how t h rayhttps://www.blogger.com/profile/00150085167540063914noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-19001365464984999962014-02-04T09:33:08.369-05:002014-02-04T09:33:08.369-05:00You're comment can be summed up as "mostl...You're comment can be summed up as "mostly true, but irrelevant to my questions".<br /><br />Certainly my impression is that few, if any, people outside of Joy Christian's own circle of followers think that he has found something significant. Certainly there are people who are outside the mainstream themselves who are not convinced, so his lack of reception is not due to the Phillip Helbighttps://www.blogger.com/profile/12067585245603436809noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47274379967370036012014-02-04T09:06:16.497-05:002014-02-04T09:06:16.497-05:00Philip,
"I asked whether anyone else (apart...Philip, <br /><br />"I asked whether anyone else (apart from Joy's followers, of course) shares his ideas about the 3-sphere ..."<br /><br />Does anyone apart from Bell's followers share his ideas about the necessity to introduce probabilism into functions that are essentially classically continuous?<br /><br />" ... and whether any mainstream scientist has claimed that hist h rayhttps://www.blogger.com/profile/00150085167540063914noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-39542601182071810312014-02-04T04:13:38.257-05:002014-02-04T04:13:38.257-05:00Your comment on Stephen Hawking black hole is spot...Your comment on Stephen Hawking black hole is spotless, as usual. So good that it was translated on the italian blog of "Le Scienze" (more or less the italian version of Scientific American).<br /><br />What I found quite funny was your presentation box (I try a rough translation from italian): "Sabine Hossenfelder teaches high-energu physics at Nordic Institute for Theoretical Lucahttps://www.blogger.com/profile/07878744590151886949noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-28494928073589195422014-02-03T15:57:49.796-05:002014-02-03T15:57:49.796-05:00t y ray,
You are right of course. But topology is...t y ray, <br />You are right of course. But topology is much deeper than that. The complex plane and abstract coordinate space, even distance in jumps and values in an absolute sense (a motion within a slice of stillness) is a paradox of false dichotomy beyond ideas of consensus or the said Dickson of the foundations as math or physics.<br />All this seems to me as I adapt to better understand itL. Edgar Ottohttps://www.blogger.com/profile/00525169618204198073noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-37147892383576360572014-02-03T15:13:14.066-05:002014-02-03T15:13:14.066-05:00Oops - can't edit comments, so take "spac...Oops - can't edit comments, so take "spacetime curvature can creates particle" as lolcat grammar and the meaning should be clear.Steve Brysonhttps://www.blogger.com/profile/08814784589747523294noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-70935282851003754532014-02-03T15:09:59.347-05:002014-02-03T15:09:59.347-05:00Hi Sabine - What a fantastic article and discussio...Hi Sabine - What a fantastic article and discussion. I'm particularly happy to see your characterization of the "pair production near the event horizon" account of Hawking radiation as misleading. <br /><br />Regarding an "explanation of Hawking radiation that makes any sense", here is my wanna-be-expert-but-not-expert understanding: the very (measured) existence of a Steve Brysonhttps://www.blogger.com/profile/08814784589747523294noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-22786581086452948412014-02-03T14:24:58.810-05:002014-02-03T14:24:58.810-05:00This is the third blog comment I've written to...This is the third blog comment I've written today involving a false dichotomy. Yes, science is not always done by mainstream consensus and radical proposals have often proved to be correct. However, more often than not they have proved to be incorrect. In any case, Joy Christian's ideas are right or wrong, regardless of what the consensus is. So, I asked whether anyone else (apart Phillip Helbighttps://www.blogger.com/profile/12067585245603436809noreply@blogger.com