tag:blogger.com,1999:blog-22973357.post115758711551533434..comments2023-09-27T07:44:19.769-04:00Comments on Sabine Hossenfelder: Backreaction: Pencils, Black Holes, and the Klein ParadoxSabine Hossenfelderhttp://www.blogger.com/profile/06151209308084588985noreply@blogger.comBlogger10125tag:blogger.com,1999:blog-22973357.post-1157835871231603052006-09-09T17:04:00.000-04:002006-09-09T17:04:00.000-04:00The "Klein paradox" has another interesting implic...The "Klein paradox" has another interesting implication. A strong enough "repulsive" potential plugged in to the Dirac equation actually has bound state solutions, counter to what one would expect. So if you treat the Maxwell-Dirac equations as a coupled set of PDE's, a strongly concentrated spinor field (a charged spinning lump) produces the sufficiently "repulsive" electric field necessary to Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1157735153753230302006-09-08T13:05:00.000-04:002006-09-08T13:05:00.000-04:00Thanks for the heads up! It is in the footnotes b...Thanks for the heads up! It is in the footnotes between theory and reality where the fun hides. Somebody do an Equivalence Principle parity test! Is there a chiral pseudoscalar vacuum background? Affine and teleparallel gravitation predict an observable EP parity anomaly. GR less Cartan's affine connection cannot handle observed Earth-moon spin-orbit momentum exchange. Take the hint.<BR/><Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1157715539602098072006-09-08T07:38:00.000-04:002006-09-08T07:38:00.000-04:00Hi rillian,thank you for your excellent and exhaus...Hi rillian,<BR/><BR/>thank you for your excellent and exhaustive answer to pauls question - you spared me some wirk, since I was about to write roughly the same ;-)<BR/><BR/>Hi Uncle Al,<BR/><BR/>the "sparking vacuum" would set in for nuclei with Z = 137 if the nucleus was exactly point-like. Since in reality, it has an extension, and since the s electrons are diving into the nucleus, they stefanhttps://www.blogger.com/profile/09495628046446378453noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1157700630341879292006-09-08T03:30:00.000-04:002006-09-08T03:30:00.000-04:00Paul Valletta,The weight change between a full and...Paul Valletta,<BR/><BR/>The weight change between a full and empty battery is very, very small. The use of the term "charge" with batteries is quite loose: a battery works by having a chemical reaction that wants to happen, but cannot unless electrons flow out of one terminal of the battery, through some electric circuit, and back in the other. Thus, there's no net change in the charge of the Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1157651366323716552006-09-07T13:49:00.000-04:002006-09-07T13:49:00.000-04:00A nucleus with Z~1/alpha (reciprocal of the Fine S...A nucleus with Z~1/alpha (reciprocal of the Fine Structure constant, ~137) would spontaneously spark the vacuum and inverse beta decay. Z~170 seems rather unlikely.<BR/><BR/>Expanding graphite layer by layer is old hat - almost any strong Lews acid or base will intercalate, including volumetically big ones like SbF5 and dibenzenechromium. Grafoil gasket material is exfoliated reconsolidated Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1157643943523890042006-09-07T11:45:00.000-04:002006-09-07T11:45:00.000-04:00On the Quantum Hall EffectBee might offer her opin...On the <A HREF="http://eskesthai.blogspot.com/2006/09/quantum-hall-effect.html" REL="nofollow">Quantum Hall Effect</A><BR/><BR/>Bee might offer her opinion on blackholes in this regard?PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1157639721720607382006-09-07T10:35:00.000-04:002006-09-07T10:35:00.000-04:00Hi paul,I think you might of be refering to this l...Hi paul,<BR/><BR/>I think you might of be refering to <A HREF="http://www.hfml.kun.nl/levitate.html" REL="nofollow">this link</A> you gave me some time back.PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1157639484329529732006-09-07T10:31:00.000-04:002006-09-07T10:31:00.000-04:00I mean if we could find where the extra energy was...I mean if we could find where the extra energy was going in LHC, what would this do for the <A HREF="http://eskesthai.blogspot.com/2006/05/so-what-did-i-mean-by-olympics.html" REL="nofollow">bose Nova</A>? Lagrangian perspective on states of equalibrium<BR/><BR/><A HREF="http://eskesthai.blogspot.com/2006/07/right-spin-for-neutrino-superfluid.html" REL="nofollow">Kapusta points out that the PlatoHagelhttps://www.blogger.com/profile/00849253658526056393noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1157633346565625032006-09-07T08:49:00.000-04:002006-09-07T08:49:00.000-04:00Hi Stefan,well written science post.Clear & concis...Hi Stefan,<BR/>well written science post.<BR/>Clear & concise overview & details.<BR/><BR/>Thanks also for the links to:<BR/>"news item at Science: Black Hole in a Pencil." <BR/>The uni augsburg and<BR/>Mesoscopic Physics group<BR/>have some awesome images too<BR/><BR/>I'm hoping to do another post on blackholes next week, hope to offer a link to this one then. - Q.QUASAR9https://www.blogger.com/profile/00593390598251093182noreply@blogger.comtag:blogger.com,1999:blog-22973357.post-1157603899674775192006-09-07T00:38:00.000-04:002006-09-07T00:38:00.000-04:00Stefan, another facinating post!A number of years ...Stefan, another facinating post!<BR/><BR/>A number of years ago my interest in graphene was directed to the process detailed in your post, so I will ask a question if I may?<BR/><BR/>Q)In conventional everyday batteries such a AA,AAA (camera's type etc..) what is the difference in weight of a "full" and "empty" battery?<BR/><BR/>Does the loss of charge relate to a loss of weight?<BR/><BR/>There Anonymousnoreply@blogger.com