tag:blogger.com,1999:blog-22973357.post3332090087479293817..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: This and ThatSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger28125tag:blogger.com,1999:blog-22973357.post-67918083339844461402010-12-15T02:09:14.419-05:002010-12-15T02:09:14.419-05:00"For something to eat, something else has to ...<b>"For something to eat, something else has to die. I basically look at the Earth as a rotating buffet, with weather."</b><br />... George Carlin<br /><br />Carlin obviously never heard of rock-eating bacteria, but who expects good Science from a comedian? For that matter, how many great scientists would have made great stand-up comedians (Susskind? Zee?), and vice versa (Seinfeld, Steven Colyerhttps://www.blogger.com/profile/10435759210177642257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-78563237720777949022010-12-15T01:01:52.879-05:002010-12-15T01:01:52.879-05:00Hi Bee,
You said: ” I know it sounds heartless, ...Hi Bee,<br /><br />You said: <i>” I know it sounds heartless, but imho being eaten is part of evolution, being cute doesn't help.”</i><br /><br />I most heartily agree and find myself inspired as to express it poetically in the spirit of Tennyson.<br /><br /><br /><i><b>I hold it true, whate'er befall;<br />I feel it, when I sorrow most;<br />'Tis better to have loved and lost<br />Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-17439999143611475222010-12-15T00:58:47.713-05:002010-12-15T00:58:47.713-05:00This comment has been removed by the author.Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-3375380968527370612010-12-15T00:44:28.048-05:002010-12-15T00:44:28.048-05:00This comment has been removed by the author.Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-54008737925409226952010-12-14T10:55:22.524-05:002010-12-14T10:55:22.524-05:00Hi Phil,
I've learned it's better to avoi...Hi Phil,<br /><br />I've learned it's better to avoid asking people why they're vegetarians, one risks eternal arguments along the lines of "but baby chickens are sooo cute" etc, which easily spoils every dinner party. I know it sounds heartless, but imho being eaten is part of evolution, being cute doesn't help. I don't care very much what people eat or don't Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-83974362123629975232010-12-14T10:46:51.825-05:002010-12-14T10:46:51.825-05:00Hi Arun,
Thanks for the references, I didn't ...Hi Arun,<br /><br />Thanks for the references, I didn't know any of that! Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-32704076888888665502010-12-14T10:45:54.878-05:002010-12-14T10:45:54.878-05:00Hi damigiana,
Yes, that's right :-) In contra...Hi damigiana,<br /><br />Yes, that's right :-) In contrast to everybody's expectation I've reached 36 weeks. Ironically, instead of being happy about it, the docs are now telling me I'd better deliver as soon as possible. Like, there's exactly one good day to have twins which is (according to their counting) TODAY! Seems like we'll miss the deadline though. I find it Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-45531417130010338212010-12-13T16:09:05.219-05:002010-12-13T16:09:05.219-05:00In a This and That post, perhaps this is OK - it i...In a This and That post, perhaps this is OK - it is a link to a school teacher calling for more passionate teachers of physics in England.<br /><br /><a href="http://www.guardian.co.uk/science/blog/2010/dec/13/physics-teachers-shortage" rel="nofollow">http://www.guardian.co.uk/science/blog/2010/dec/13/physics-teachers-shortage</a>Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-28778606493841548172010-12-13T09:53:15.149-05:002010-12-13T09:53:15.149-05:00Hi Bee,
the science writer did not understand you...Hi Bee,<br /><br />the science writer did not understand you. Or she tried to make a story about things where there is no story to make of. Both is not very good. <br /><br />Best, KayKay zum Feldehttps://www.blogger.com/profile/04233793196547147876noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-71970250188739678692010-12-12T20:55:21.308-05:002010-12-12T20:55:21.308-05:00"that is time contraction in a reduced gravit..."that is time contraction in a reduced gravitational field or during deceleration".<br /><br />Oops. Make that Instead time contraction in a reduced gravitational field or during reduced acceleration. Big difference.Erichttps://www.blogger.com/profile/08213251864943443334noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-34482987191127841812010-12-12T20:47:59.474-05:002010-12-12T20:47:59.474-05:00Let me clarify a few things. In SR obviosly time o...Let me clarify a few things. In SR obviosly time or length could appear just as well to be contracting or expanding in a different inertial reference frame, depending on whether the object is leaving or arriving (the Doppler effect). The same could said to be true in GR. That is, time dilation during acceleration or an increased gravitational field and time contraction in during deceleration orErichttps://www.blogger.com/profile/08213251864943443334noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-14320529631196431172010-12-12T20:32:17.172-05:002010-12-12T20:32:17.172-05:00Economically, it is much easier to justify in vitr...Economically, it is much easier to justify in vitro organ production for transplants. Even at $2000/lb, it is easy to justify the cost of a 5 lb liver for a life saving transplant. I suppose if the price comes down enough, we could justify the cost of a pound of liver for eating. On the other hand, I prefer the flavor of meat from free ranging animals to meat from factory farmed animals, and I Exl Bloggerhttps://www.blogger.com/profile/01383080419846815353noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-59955721198694479642010-12-12T18:21:45.120-05:002010-12-12T18:21:45.120-05:00Bee,
Congrats on reaching 36 weeks, especially if ...Bee,<br />Congrats on reaching 36 weeks, especially if it really is true that it is the normal duration for twins. I knew good thoughts from others would help.<br /><br />Since my current interest in physics is asymptotic freedom/safety/confinement I would be interested in a capsule summary of your paper regarding DSR. I have never been clear on the motivation for DSR. My understanding is that Erichttps://www.blogger.com/profile/08213251864943443334noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-153016354088547402010-12-12T16:52:57.954-05:002010-12-12T16:52:57.954-05:00I know this is totally OT, but the counter shows t...I know this is totally OT, but the counter shows that you're now at 36 weeks, which I was told is term for twins. Congratulations!<br />[Sorry if you think this is too personal... but I remember the yippee feeling when I made it to 36 weeks]Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-17300190216732565502010-12-11T10:10:07.486-05:002010-12-11T10:10:07.486-05:00Hi Bee,
There is easy-to-find on the Internet, a ...Hi Bee,<br /><br />There is easy-to-find on the Internet, a document "The In Vitro Consortium Preliminary Economics Study, Project 29071, V5 March 2008".<br /><br />Not counting R&D costs, using capital costs factored from known technology; using growth medicum costs based on current commercially available-in-small quantities medium and applying hypothetical volume discounts, and Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-59236797786878663012010-12-11T07:36:25.802-05:002010-12-11T07:36:25.802-05:00Hi Bee,
Being of the generation which preceded th...Hi Bee,<br /><br />Being of the generation which preceded the current one, which more are preoccupied with the morality issues attached to what they consume, I’ve always found it interesting what it being which gave rise to such concerns. That is particularly as should also be noted it’s pretty clear that such a trend sprang forth from institutes of higher learning, to then after permeate Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-27313740683200239442010-12-11T07:32:44.215-05:002010-12-11T07:32:44.215-05:00Hi Phil,
Yes, the problem you hint at is one of b...Hi Phil,<br /><br />Yes, the problem you hint at is one of backreaction from the environment, which is very relevant for most systems involving humans. That includes that the "elements" of the system might modify their behavior once you've come up with a model for it (the model being part of the environment). You always need to make sure the backreaction is negligible for one reasonSabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-69127035315500673822010-12-11T07:30:17.940-05:002010-12-11T07:30:17.940-05:00This comment has been removed by the author.Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-25494191468625203382010-12-11T07:27:54.427-05:002010-12-11T07:27:54.427-05:00Hi Arun,
Once the necessary technology is in plac...Hi Arun,<br /><br />Once the necessary technology is in place my guess is it would be cheaper. You'd save a lot of money on keeping the animals - or rather the organ bags - happy, so to speak. They wouldn't need place to move, they'd shit where you'd put them, wouldn't make noise, would probably rarely get sick because where would they pick up germs, and since you've Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-75952428673608479352010-12-11T06:21:47.669-05:002010-12-11T06:21:47.669-05:00Hi Uncle,
Parts of the brain serve important func...Hi Uncle,<br /><br />Parts of the brain serve important functions in regulating the metabolism. Just chopping the head off wouldn't work. However, big parts of the brain are entirely unnecessary when it just comes to growth, so a reduced version would do. Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-69321747244869459462010-12-11T06:19:44.357-05:002010-12-11T06:19:44.357-05:00Hi Steve,
No, the paper has about nothing to do w...Hi Steve,<br /><br />No, the paper has about nothing to do with LQG, except that DSR has been motivated by LQG. <br /><br />Your bet on the delivery date is Wednesday next week? Well, I'll let the babies know ;-) <br /><br />As you say, a laser beam is not "nothing." Best,<br /><br />B.Sabine Hossenfelderhttps://www.blogger.com/profile/06151209308084588985noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-31683903154778212012010-12-11T05:17:21.090-05:002010-12-11T05:17:21.090-05:00Hi Bee,
“What's at the center of black holes”...Hi Bee,<br /><br /><i>“What's at the center of black holes”</i><br /><br />Perhaps the better question being, does it make sense to say a black hole has a center; that is at least from the perspective of it being a place, describing a where and a when. Perhaps the difficulty lies with the description being used, as such places not quantifiable rather only qualifiable with a how and a why. Phil Warnellhttps://www.blogger.com/profile/15671311338712852659noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-69323012594698184462010-12-11T05:16:28.548-05:002010-12-11T05:16:28.548-05:00Hi Bee,
So does it really work out cheaper to con...Hi Bee,<br /><br />So does it really work out cheaper to convert grain and hay into cell culture medium and from there into meat than to use the animal?<br /><br />Would such in vitro cloned meats tempt you?<br /><br />And Steve Colyer's question :)Arunhttps://www.blogger.com/profile/03451666670728177970noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-2375528433866241992010-12-11T04:48:27.896-05:002010-12-11T04:48:27.896-05:00Bee, that's a Loop Quantum Gravity paper, isn&...Bee, that's a Loop Quantum Gravity paper, isn't it? Well, even if it isn't, I get the impression that LQG papers are being published at a faster rate than ever, an impression which I believe comes from a comment at Woit's blog. Is that true? Where IS LQG lately?<br /><br />As an aside ... are your daughters going to be born on Wednesday? That was my initial bet, with myself. I'Steven Colyerhttps://www.blogger.com/profile/10435759210177642257noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-60377256635064037582010-12-10T17:45:40.256-05:002010-12-10T17:45:40.256-05:00Yup, congrats on Phys Rev. D., Bee. :-)Yup, congrats on Phys Rev. D., Bee. :-)Steven Colyerhttps://www.blogger.com/profile/10435759210177642257noreply@blogger.com