tag:blogger.com,1999:blog-22973357.post6043678415764450501..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: InternaSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger59125tag:blogger.com,1999:blog-22973357.post-33026672317092490812009-07-05T03:36:53.702-04:002009-07-05T03:36:53.702-04:00Hi Jeremy,
Well, the difference is that we know w...Hi Jeremy,<br /><br />Well, the difference is that we know we can be in the same place at two different times. <br /><br />Thanks for your kind wishes regarding my job search. <a href="http://backreaction.blogspot.com/2009/04/moving-on.html" rel="nofollow">I did find a new job</a>, and am presently organizing my move.<br /><br />Hope to see you around...<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45964100750412900762009-07-04T16:01:51.580-04:002009-07-04T16:01:51.580-04:00Bee, I absolutely love your blog. This is my first...Bee, I absolutely love your blog. This is my first time posting, but I think I'll be around for a while.<br /><br />As to the question of "Now" being different than past or future, I think <br />I agree with you. But I feel I am missing something profound here (?)<br /><br />In what sense would it be meaningful for "Now" to be any different than past or future? (other Anonymoushttps://www.blogger.com/profile/12099004456880543722noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-83483487709692080002008-05-07T03:05:00.000-04:002008-05-07T03:05:00.000-04:00Hi Robert,No, sorry, we're headed North instead! -...Hi Robert,<BR/><BR/>No, sorry, we're headed North instead! <BR/><BR/>-B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-19250376394072630162008-05-06T13:49:00.000-04:002008-05-06T13:49:00.000-04:00Bee:” Similarly, had I told you I don't like getti...Bee:” Similarly, had I told you I don't like getting up early, and clarified with early I mean before ten a.m., you could suggest I should understand early as being before six a.m. But I still wouldn't like getting up at nine.”<BR/><BR/>Perhaps, you could suggest I should understand that as: I don’t like E.P.Wigner too.<BR/><BR/>If so, why?<BR/><BR/>Regards, Dany.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-89208702309493427752008-05-05T17:02:00.000-04:002008-05-05T17:02:00.000-04:00Arun writes,"...then the only remaining mystery is...Arun writes,<BR/><BR/>"...then the only remaining mystery is why different observers' shrinking lightcones always point in the same direction."<BR/><BR/>My hunch is that by manipulating gravity, dark energy determines the direction and, to a lesser, the "speed" of light cones. <BR/><BR/>Light cones contain a pretty clear fossil record of electromagnetism, but a not so clear fossil record of the Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-5276683023397233572008-05-05T07:59:00.000-04:002008-05-05T07:59:00.000-04:00Will you be passing through Munich by any chance?Will you be passing through Munich by any chance?Roberthttps://www.blogger.com/profile/06634377111195468947noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-67012334197559104712008-05-05T01:52:00.000-04:002008-05-05T01:52:00.000-04:00My present moment is composed entirely of things f...My present moment is composed entirely of things from my past lightcone. <BR/><BR/>Special Relativity tells me that all observers agree on what events are in my past lightcone.<BR/><BR/>Special Relativity also tells me that when I try to extend my present moment to a global plane of simultaneity, then it is subjective. Given any two events in this extended present that I consider simultaneous Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-53900101638274106132008-05-03T15:18:00.000-04:002008-05-03T15:18:00.000-04:00Dear Arun,Indeed, this is about the same direction...Dear Arun,<BR/><BR/>Indeed, this is about the same directions my thougt went, <A HREF="http://backreaction.blogspot.com/2008/05/every-now-and-then.html" REL="nofollow">see the recent post</A>. Best,<BR/><BR/>B.<BR/><BR/>PS: Anybody noticed that one can now 'schedule' drafts to appear?Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47516919700606006012008-05-03T12:46:00.000-04:002008-05-03T12:46:00.000-04:00Hi Bee,“I've come to realize 'early' is very relat...Hi Bee,<BR/><BR/>“I've come to realize 'early' is very relative… You don't have to post as 'anonymous' even if you don't have a blogger account (or one of the other options).”<BR/><BR/>I apologize if you will consider that off-topic: it is on paradoxes of relativity, anonymity and memory:<BR/><BR/>1)Anonymity; I know and agree with your arguments on that, but only with respect (relatively) if Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-34314122252420171692008-05-03T10:52:00.000-04:002008-05-03T10:52:00.000-04:00Arun:Cudgel my brain, but I cannot remember the fu...<B>Arun</B>:<I>Cudgel my brain, but I cannot remember the future.</I><BR/><BR/>You just don't remember it Arun. :)<BR/><BR/> You are the best architect of your own social future. We have previews of it all the time when we project ourselves(some better then others).<BR/><BR/> You might think we might not of moved, but the seeds had already been planted?<BR/><BR/>So in that sense, the future is a PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-67866422887250476012008-05-03T10:22:00.000-04:002008-05-03T10:22:00.000-04:00Cudgel my brain, but I cannot remember the future....Cudgel my brain, but I cannot remember the future. <BR/><BR/>Whatever the stuff of our consciousness, presumably it arose via evolution, which means it is a useful construct for the handling of reality, and so with its sense of time. That is, the lifelines - the sum total of spacetime events involving the ancestors and descendants of creatures with memories extend longer than those without.<BR/>Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-62993279187345940912008-05-03T08:33:00.000-04:002008-05-03T08:33:00.000-04:00Hi Kris,“If there is one, the reference frame sing...Hi Kris,<BR/><BR/>“If there is one, the reference frame singled out by the cosmic microwave background might be a good guess. More local preferred frames have also been proposed such as of the that of the "Great Attractor."”<BR/><BR/>Yes and yet none of these exist in, although manifest of configuration space. In relation to this, some months back I read Prof. Harvey Brown’s (of Oxford)book Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-47151352506341151242008-05-03T07:37:00.000-04:002008-05-03T07:37:00.000-04:00Hi Bee,“Regarding the flight time, it's not the bo...Hi Bee,<BR/><BR/>“Regarding the flight time, it's not the boredom, but the sitting. My version of hell is an economy seat on an eternal flight to nowhere.”<BR/><BR/>You truly are a Bee; for I must admit when I imagine one it is always in motion. This then leads me to wonder, how you are when you write this blog or read one of the many books you manage to and often post a review? :-) I would Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-51644080836615204872008-05-03T07:17:00.000-04:002008-05-03T07:17:00.000-04:00Hi KrisRovelli's statement is based on GR not on L...Hi Kris<BR/><BR/>Rovelli's statement is based on GR not on LQG.<BR/><BR/>RegardsAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-78703744740247018552008-05-03T06:58:00.000-04:002008-05-03T06:58:00.000-04:00Hi Carl,Where in Quantum Theory is the past fixed ...Hi Carl,<BR/><BR/>Where in Quantum Theory is the past fixed by the present; for uncertainty would imply that the present remains uncertain as does the future. Uncertainty in the strict sense is not as a consequence of ability, yet rather a restriction of nature. So if the present remains uncertain, what then has the past not to be so? Wheeler’s delayed choice would appear to imply that the Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1665026074202380222008-05-03T06:45:00.000-04:002008-05-03T06:45:00.000-04:00Hi Phil,Regarding the flight time, it's not the bo...Hi Phil,<BR/><BR/>Regarding the flight time, it's not the boredom, but the sitting. My version of hell is an economy seat on an eternal flight to nowhere. Air Canada doesn't only allow laptop use, they now even have power outlets and USP ports! I hardly ever use my laptop on airplanes though. <BR/><BR/>Regarding consciousness, I hope it will become clearer in the next post what I meant. I'll be Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-53134041909070323462008-05-03T06:18:00.000-04:002008-05-03T06:18:00.000-04:00OT: You don't have to post as 'anonymous' even if ...OT: You don't have to post as 'anonymous' even if you don't have a blogger account (or one of the other options). If you choose 'Name/URL' you can enter a name (you don't have to enter an URL). I'm suggesting this because it is much easier to follow the comment section if the posts start with 'X said...'Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-41414597380283025112008-05-03T05:57:00.000-04:002008-05-03T05:57:00.000-04:00Hi Dany,Sure. Thanks for sharing your point of vie...Hi Dany,<BR/><BR/>Sure. Thanks for sharing your point of view. Best,<BR/><BR/>B.<BR/><BR/>PS: Living in North America with most of my friends and family in Europe, I've come to realize 'early' is very relative :-)Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-51297013466148590802008-05-03T05:27:00.000-04:002008-05-03T05:27:00.000-04:00Hi Bee,Generally speaking, I wrote my comments to ...Hi Bee,<BR/><BR/>Generally speaking, I wrote my comments to present my POV and to discuss/compare it with others as others. I have no intention to force you to accept my POV or convince you to change yours.<BR/><BR/>“I didn't say there's anything wrong with Feynman or his book... Not saying it's not a good book - it is. I just didn't like it.”<BR/><BR/>I supposed to know to read.<BR/><BR/>“Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-76237260555226166422008-05-03T03:49:00.000-04:002008-05-03T03:49:00.000-04:00Hi Dany,Why you choose something unsatisfactory in...Hi Dany,<BR/><BR/><I>Why you choose something unsatisfactory instead to what actually constitutes a measurement in practice? I prefer E.P.Wigner definition [...]</I><BR/><BR/>I say I find X unsatisfactory, and upon asked clarify with X I mean soandso. You then suggest to understand X instead as thisandthat. Similarly, had I told you I don't like getting up early, and clarified with early I mean Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-9937127425979589642008-05-03T02:09:00.000-04:002008-05-03T02:09:00.000-04:00If you were a conscious photon I think you could e...If you were a conscious photon I think you could experience a full past and future as your present. We kind of only I think experience a present state (that includes a memory of the past) because we are constantly repicking the part of the worldline that goes into the future. It's like we only get to branch at the present while the photon can branch anywhere along it's worldline. I may not be Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-32244807707930918072008-05-03T01:45:00.000-04:002008-05-03T01:45:00.000-04:00Hi Bee,“I meant it in the operational sense in the...Hi Bee,<BR/><BR/>“I meant it in the operational sense in the standard framework of picking an eigenvalue with the probability belonging to it, which I find rather unsatisfactory as to what actually constitutes a measurement in practice that justifies this procedure.”<BR/><BR/>Why you choose something unsatisfactory instead to what actually constitutes a measurement in practice? I prefer Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-3554779163792177782008-05-02T18:50:00.000-04:002008-05-02T18:50:00.000-04:00Hi Phil,...what forms the preference?As a preferre...Hi Phil,<BR/><BR/><I>...what forms the preference?</I><BR/><BR/>As a preferred frame for the universe, Einstein used to speak about "the fixed stars." If there is one, the reference frame singled out by the cosmic microwave background might be a good guess. More local preferred frames have also been proposed such as of the that of the "Great Attractor."<BR/><BR/>The WMAP quadrupole CMB Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-79635814356738651422008-05-02T18:04:00.000-04:002008-05-02T18:04:00.000-04:00Hi Giotis,Definition of dogma: "A religious doctri...Hi Giotis,<BR/><BR/>Definition of dogma: "A religious doctrine that is proclaimed as true without proof." How is this any different?<BR/><BR/>Dr. Rovelli's statement would carry more weight if he had actually achieved some of the lofty goals he has attributed to LQG.<BR/><BR/>As Feynman pointed out at the end of his Nobel Prize Lecture, many viewpoints are possible in physics, and its hard to Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-3231548628967190652008-05-02T16:21:00.000-04:002008-05-02T16:21:00.000-04:00HelloThere is no past, present or future. There ar...Hello<BR/><BR/>There is no past, present or future. There are only events upon other events and related to other events. They evolve not in time and space but in relation to other events and "themselves". <BR/><BR/>Rovelli said: <BR/>"We need to free ourselves from the prejudices associated with the habit of thinking of the world as inhabiting space and evolving in time".<BR/><BR/>RegardsAnonymousnoreply@blogger.com