tag:blogger.com,1999:blog-22973357.post4705888154131218085..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Bekenstein-Hawking entropy, strong and weak formSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger23125tag:blogger.com,1999:blog-22973357.post-61531900692631433082015-09-29T08:41:21.338-04:002015-09-29T08:41:21.338-04:00Here is my contribution to a weak interpretation o...Here is my contribution to a weak interpretation of BH entropy:<br />http://arxiv.org/abs/1507.00591Anonymoushttps://www.blogger.com/profile/15989736198903155717noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45138403630369998742012-07-23T09:50:35.392-04:002012-07-23T09:50:35.392-04:00I would react to this article: Complementarity or ...I would react to this article: <a href="http://arxiv.org/abs/1207.3123" rel="nofollow">Complementarity or Firewalls</a>? Why not both? These two animations (<a href="http://oi50.tinypic.com/2ds44rt.jpg" rel="nofollow">1</a>, <a href="http://oi50.tinypic.com/blamw.jpg" rel="nofollow">2</a>) are illustrating it clearly. Just the evaporation of massive object inside of black hole may be perceived Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-25232811985045629512012-07-18T01:18:34.927-04:002012-07-18T01:18:34.927-04:00Hi Uncle,
Right. I should have looked up the Eart...Hi Uncle,<br /><br />Right. I should have looked up the Earth mass before writing nonsense, it seems we're saying the same anyway. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1510719355522782312012-07-18T01:16:40.422-04:002012-07-18T01:16:40.422-04:00Hi rickyjames,
Yes, that's normally assumed t...Hi rickyjames,<br /><br />Yes, that's normally assumed to happen. Read for example <a href="http://arxiv.org/abs/hep-th/0601059" rel="nofollow">section II of this paper</a>, which discusses exactly this example. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-36241276603497601062012-07-18T01:12:40.273-04:002012-07-18T01:12:40.273-04:00Sam,
I don't see how this would make a differ...Sam,<br /><br />I don't see how this would make a difference. From the outside these things look like normal black holes. Put your surface there and calculate the entropy inside. It can be arbitrarily large. How does using the covariant bound change anything about that? Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-75215814010279927532012-07-17T19:16:14.833-04:002012-07-17T19:16:14.833-04:00"Let me also add that there exist known solut..."Let me also add that there exist known solutions to Einstein's field equations that violate the holographic bound, though it is unclear if they are physically meaningful, see this earlier post."<br /><br />It has been known for some time that the naive bound claiming that any 2-sphere contains at most a finite entropy is violated. The (as far as I know) correct bound is the Samhttps://www.blogger.com/profile/03631513672156985312noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-76255789530720336782012-07-17T15:30:17.795-04:002012-07-17T15:30:17.795-04:00Questions I've wondered about - say a pair of ...Questions I've wondered about - say a pair of entangled photons are produced and one crosses the event horizon of a black hole. If the "free" photon is then "polarized", does the "trapped" one follow suit? What if the "trapped" photon is polarized "first" by equipment that was previously sent across the event horizon - does the "free&rickyjameshttps://www.blogger.com/profile/09303372085007768799noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-81283446039279449612012-07-17T12:15:26.549-04:002012-07-17T12:15:26.549-04:00Apology for the double post tendered in turn. &quo...Apology for the double post tendered in turn. "8^>) Thermodynamics proposes, kinetics disposes. Theory employing processes that cannot empirically obtain is uncomfortable.<br /><br />Earth's mass is 5.9723x10^27 g or 5.9723x10^24 kg. Let's calculate explicitly given a full Earth mass (limited by the uncertainty in G),<br /><br />(T_H) = [(h-bar)c^3]/[8(pi)GM(k_b)]<br />[(Uncle Alhttps://www.blogger.com/profile/05056804084187606211noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-68564241567960617772012-07-17T00:49:24.246-04:002012-07-17T00:49:24.246-04:00Hi Alex,
No. Best,
B.Hi Alex,<br /><br />No. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-29797671454076370902012-07-17T00:48:31.811-04:002012-07-17T00:48:31.811-04:00Hi Uncle,
Your comment was stuck in the spam filt...Hi Uncle,<br /><br />Your comment was stuck in the spam filter, sorry about that. Maybe check your numbers, I believe I recall it being giant black holes, masses of 10^27g or so, that have a temperature comparable to the CMB. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-26058747322650499702012-07-16T19:18:55.799-04:002012-07-16T19:18:55.799-04:00Could it be that the holographic principle is the ...Could it be that the holographic principle is the result of something analogous to mistaking an energy for a torque because they happen to have the same units?Anonymoushttps://www.blogger.com/profile/00212397105465630887noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-22889528402137952982012-07-16T18:46:30.250-04:002012-07-16T18:46:30.250-04:00The dense aether model prefers the steady state Un...The dense aether model prefers the steady state Universe model, so it requires to find some model for black hole evaporation - or we would have the Universe already full of black holes. Recently the <a href="http://arxiv.org/abs/arXiv:1203.4681" rel="nofollow">axion condensation</a> based theory <a href="http://www.tuwien.ac.at/fileadmin/t/tuwien/docs/pa/black_holes.pdf" rel="nofollow">gained Zephirhttps://www.blogger.com/profile/06010623752049244967noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-22675899869026953432012-07-16T15:15:19.258-04:002012-07-16T15:15:19.258-04:00I don't know why people are so intent on using...I don't know why people are so intent on using the BH entropy paradox as the clue to the quantum gravity question. There is obviously a vital piece of information that is missing that makes it a paradox. I don't have an answer or a clue about it and I don't think anyone else who has published about it has one either. I could be wrong.<br /><br />The point being is that when a person Erichttps://www.blogger.com/profile/08213251864943443334noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-69554633454900484672012-07-16T12:57:34.307-04:002012-07-16T12:57:34.307-04:00"taking the black hole up to the same fixed m...<i>"taking the black hole up to the same fixed mass M' larger than M and letting it radiate back down to M."</i> Real world black holes have event horizon temperatures below that of the cosmic microwave background. They only accrete.<br /><br />(T_H) = [(h-bar)c^3]/[8(pi)GM(k_b)]<br />P = [(h-bar)c^6]/[15360(pi)G^2M^2]<br />(r_s) = 2GM/c^2 <br /><br />CMB temp is 2.725 K or Uncle Alhttps://www.blogger.com/profile/05056804084187606211noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-70986537508847744072012-07-16T12:26:42.500-04:002012-07-16T12:26:42.500-04:00“Whereas Plato envisioned common perceptions as re...<i>“Whereas Plato envisioned common perceptions as revealing a mere shadow of reality, the holographic principle concurs, but turns the metaphor on it’s head. The Shadows-then things that are flattened out and hence live on a lower-dimensional surface-are real, while what seemed to be more richly structured, higher dimensional entities (us; the world around us) are evanescent projections of the PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-62161463812701307952012-07-16T12:09:48.203-04:002012-07-16T12:09:48.203-04:00Blackhole wars(The Cosmic Landscape, by Leonard Su...<a href="http://4.bp.blogspot.com/_cldxKGOzgeM/SXJgBaGe0zI/AAAAAAAAB_c/x5ClMFIYHSo/s400/blackhole+wars1.JPG" rel="nofollow">Blackhole wars</a>(The Cosmic Landscape, by Leonard Susskind, Page 339, Para 2) no longer exist when we've located a peaceful realm in dialogue. <br /><br />Best,PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-49992451258705740492012-07-16T12:04:50.926-04:002012-07-16T12:04:50.926-04:00This comment has been removed by the author.PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-19496888401481531632012-07-16T11:18:32.713-04:002012-07-16T11:18:32.713-04:00"taking the black hole up to the same fixed m...<i>"taking the black hole up to the same fixed mass M' larger than M and letting it radiate back down to M."</i> Real world black holes have event horizon temperatures below that of the cosmic microwave background. They only net accrete.<br /><br />(T_H) = [(h-bar)c^3]/[8(pi)GM(k_b)]<br />P = [(h-bar)c^6]/[15360(pi)G^2M^2]<br />(r_s) = 2GM/c^2 <br /><br />CMB temp is 2.725 K or Uncle Alhttps://www.blogger.com/profile/05056804084187606211noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-53454635484738709042012-07-16T08:57:30.214-04:002012-07-16T08:57:30.214-04:00Vince: Sorry, I was assuming you're able to sc...Vince: Sorry, I was assuming you're able to scroll down yourself. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1288368681341405092012-07-16T07:28:01.630-04:002012-07-16T07:28:01.630-04:00I guess you mean this listhttp://www.scholarpedia....I guess you mean <a href="" rel="nofollow">this list</a>http://www.scholarpedia.org/article/Bekenstein-Hawking_entropy#What_is_behind_the_black_hole_entropy...Vincehttps://www.blogger.com/profile/14960204267566263300noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-70062183143064815382012-07-16T07:16:36.706-04:002012-07-16T07:16:36.706-04:00"It's like the universe is a really bad n..."It's like the universe is a really bad novel - just by reading the author's the name and the blurb on the cover you can already tell the plot."<br /><br />That's hilarious.Mitchellhttps://www.blogger.com/profile/10768655514143252049noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-78451288982429190812012-07-16T07:14:52.072-04:002012-07-16T07:14:52.072-04:00>> Scholarpedia has a useful list
when I c...>> Scholarpedia has a useful list <br /><br />when I click on this link I see a high level overview of BH entropy but no list or different categories of entropy.Vincehttps://www.blogger.com/profile/14960204267566263300noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-8097544175040995342012-07-16T05:43:32.495-04:002012-07-16T05:43:32.495-04:00How do you COMPRESS bosons?How do you COMPRESS bosons?Ullahttps://www.blogger.com/profile/16634036177244152897noreply@blogger.com