tag:blogger.com,1999:blog-349831912024-03-08T05:37:46.460+01:00DiY quantum gravityAn independent viewpoint about quantum gravity.Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.comBlogger114125tag:blogger.com,1999:blog-34983191.post-51328824414179280202021-09-12T14:07:00.000+02:002021-09-19T21:54:13.956+02:00About the "army of dwarves" The minions of thorin oakenshield arrival to the battle of the five armies.An spanish blogger, Francis, wrote an entire about the very sad recent death of the great Steven Weinberg. In that entire he used an expression that I had never heard, but that I find very accurate. He opposed the figure of a giant like Weinberg to the nowadays status in physics that he referred like Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com2tag:blogger.com,1999:blog-34983191.post-32929997700286265962019-02-08T11:18:00.002+01:002019-02-11T05:15:06.229+01:00Fluctuating physic as a new type physics for LHC and successors I have been absent from this blog for a long time, basically since the LHC bumb went away, but not from physics. In the last days Sabinne Hossenfelder has been again doing posts against the idea of making new coliders as, for example Why a larger particle collider is not currently a good investment. I had already written a post, years ago, saying that it is necessary to make new Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com3tag:blogger.com,1999:blog-34983191.post-7869911421271528312015-12-10T20:09:00.001+01:002015-12-10T20:09:08.186+01:00Android aplication to edit mathematical equations in latexI have been looking for a long time for a good android app that would allow me to edit equations, and get the latex code of it, but I haven´t found nothing really good, untill now ;-)
The first big step was my script smart note. It makes a great work in recognizing a handwriteen equation, and allos to export the latex code to a tex file.
But, in order to use it to write Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com0tag:blogger.com,1999:blog-34983191.post-13677661810495705862015-07-28T08:26:00.002+02:002015-07-28T08:32:32.456+02:00Stringy summer cinemaThis summer, as usual, there has been two major string conferences. One of them is the strings 2015, celebrated in India, and has been announced on the Lubos and Woit blog. The most relevant page of the conference contains the talks and includes links to the slides and videos to most of the conferences. I have seen some of them and my idea is to see all of the most relevant ones.
Until now theJavierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com1tag:blogger.com,1999:blog-34983191.post-32011619320327454452014-10-04T08:34:00.000+02:002014-10-04T08:34:05.982+02:00Why it is a good idea to build a new supercollider Sabine Hossenfelder has posted an entry in it's blog claiming that maybe it is not a good idea to build a new supercollider: Is the next supercollider a good investment?.
I have nothing aagins Sabine, but I disagree with his arguments, and I have ansered her in her facebook. Because my answer has been long enought I have decided to copy it here in the form of a brief blog entry.
I Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com0tag:blogger.com,1999:blog-34983191.post-39311996757397025832014-06-29T20:10:00.002+02:002014-08-05T08:29:00.344+02:00Strings 2014Long time since my last post. There is no particular reason, just a mix of circunstances.
I write now to advise, if someone is still not aware, about the annual convention about string theory.
The slides, and vídeos, are available online at talks online
Based on previous experience with similar cases I warm potential watchers about the fact that the videos usually are available online Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com0tag:blogger.com,1999:blog-34983191.post-50010345449506792842013-12-31T09:54:00.001+01:002013-12-31T09:54:51.309+01:00A prety good year ending in Arxiv After a somewhat disappointing year in theorethical physics where the greater topic seems to have been the black holes firewall discussion (seemingly settled in a long - around 90 pages- paper) the end year in a promising way.
One one hand we have the second paper of the famous Amplituhedron construction (I told about it in my spanish blog when it appeared) that was announced by Nima Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com2tag:blogger.com,1999:blog-34983191.post-60290045137415976982013-10-24T02:39:00.001+02:002013-10-24T07:48:28.411+02:00Spacetime kills the second law of thermodynamics, real or paradox? This summer, among many other things, have read the famous book of Susskind and Lindesay about black hole information paradox. Casually just after finishing ir's reading I have to teach in private tuition (hope I am saying it right ) statistical mechanics (a conventional introduction with the main average topics). In doing that I have revised the foundations of it from the viewpoint of Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com3tag:blogger.com,1999:blog-34983191.post-7657742203426185992013-09-27T09:47:00.002+02:002013-09-27T09:47:36.508+02:00Conference about the inmeditate future of particle physics afther the Higgs discoveringAs you can have read in the Peter Woit blog this week there was a meeting in Madrid, in the institute of theorethical physics, auspiced by the CSIC (consejo superior de investigaciones científicas, close to the UAM , autonomous university of Madrid) with the title " Why mH= 126 GeV? .
The conferences have been recorded in video and are available online (including the slides). Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com3tag:blogger.com,1999:blog-34983191.post-39427958486528294442013-05-06T09:45:00.001+02:002013-05-06T09:45:43.475+02:00Proposal for an Ig Milner prize (or trantor prize) Ok. Now that we have the Milner prize I think that it is time to go a little bit further. The nobel prize has it's counterpart, the Ig nobel, so it would be fun to have an Ig Milner. or Trantor prize`. remember Trantor is the planet that is the centre of the galactic empire in the Asivmovs book's about the foundation. In that literary universe physics Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com6tag:blogger.com,1999:blog-34983191.post-20908534321741853242013-03-21T07:27:00.002+01:002013-03-21T07:27:43.979+01:00And the third milnor prizes goes to Polyakov (maybe)I didn't write a single line about the second milner prize so I'll write a brief post about the third.
As can be read in "not even wrong" and in the blog of matt strassler it seems (but is not confirmed at the time of writing this entry) that the winner of the this third prize is Alexander Polyakov.
Everybody who has ever read a book on string theory know the name because of Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com9tag:blogger.com,1999:blog-34983191.post-76048026411980569442012-11-23T09:11:00.001+01:002015-08-26T02:15:53.297+02:00Mathjax, note 10.1 and more
I have become really tired of the problems to have a proper way to display math in blogspot. I had previously used a latex renderer but I have had problems with it. On one hand the server has changed in a few occasions, and in another the blogspot people have deleted the modifications of the template that allows the to be used.
Because of that I had become somewhat frustrated. After all Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com2tag:blogger.com,1999:blog-34983191.post-57218815084104567852012-08-12T08:57:00.001+02:002012-08-12T08:57:59.132+02:00The arrival of the Milner prices of fundamental physicThis month came by surprise a new international prize for physicists. It is oriented for works of relevance in theoretic development, even if the theories worked hasn't be tested and they can't probably be for a large amount of time.
It is created by a Russian physic doctorate Yuri Milner and it is named Fundamental Physics Prize.
It has been widespread announced in the English Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com4tag:blogger.com,1999:blog-34983191.post-77295765822648521802012-07-25T19:50:00.001+02:002012-07-29T01:58:34.439+02:00Strings 2012The LHC rules the physics blogosphere, specially since it's recent announcement about the Higgs.
None doubt of the importance of the discovery and, in general, the labour of the LHC. But that doesn't meant that nothing else is going on on physics. On the experimental side we have new experimental results on dark matter detection: on the negative by xenon amd on the possitive (but in a very non Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com0tag:blogger.com,1999:blog-34983191.post-21662369215767853032012-03-04T09:54:00.002+01:002012-03-04T09:54:45.031+01:00The LHC bluesOk, I am being deliberately a little bit negative in the title. But the sad truth is that the runs of the LHC at the 7 TeV centre of mass energy have been somewhat bit disappointing in the respect of bringing us confirmed new physic.
It has been a long time since my last post in this blog (I have keep posting in my Spanish blog) and in the while there were some interesting claims, extensively Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com0tag:blogger.com,1999:blog-34983191.post-34974989559280911722011-08-29T09:34:00.002+02:002011-08-29T09:56:10.763+02:00Geometric Models of MatterThe last Friday there was a very interesting paper in arxiv. I am really busy those days (and it will be so until around the 15 of September)so I couldn't still read ot completely. Still I think that I must leave notice of it here.
The paper in question is title like the post entry, Geometric Models of Matter. It has three authors: Michael Atiyah, Nicholas S. Manton, Bernd J. Schroers. Among Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com0tag:blogger.com,1999:blog-34983191.post-38183496316335447912011-05-30T04:55:00.005+02:002011-05-30T09:48:56.878+02:00Great day in arxivToday there are in arxiv two articles that look really great. The firs (in the order that arxiv gives to them) is from Samir D. Mathur: Effective information loss outside the horizon. It argues that there is no loss of information inside a black hole because he information simply doesn't go inside the black hole. The abstract explains it more carefully: If a system falls through a black hole Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com1tag:blogger.com,1999:blog-34983191.post-78402073848611589892011-04-19T09:12:00.002+02:002011-04-19T10:59:29.527+02:00Can we see inside black holes?The last week there was an article that was commented in the arxiv blog: Planets Could Orbit Singularities Inside Black Holes. The blog entry discuses this article: Is there life inside black holes?. The article is a pure classical relativity article. It study the possibility of stable orbits for planets inside a black hole, in particular in a Kerr-Newman black hole, that is, a rotting charged Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com0tag:blogger.com,1999:blog-34983191.post-79233744923709891462011-02-17T08:47:00.004+01:002011-02-18T10:09:26.961+01:00String theory in exotic R^4Today in arxiv there is a very curious article:Quantum D-branes and exotic smooth R^4 written by Torsten Asselmeyer-Maluga, Jerzy Krol. The article is actually the second part of a previous one: Exotic smooth R^4 and certain configurations of NS and D branes in string theory. The abstract of the first (in date order) article reads: In this paper we show that in some important cases Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com3tag:blogger.com,1999:blog-34983191.post-13578316322421559412011-02-11T08:59:00.003+01:002011-02-17T09:19:43.242+01:00String theory and nanotechnology meet today in arxivString theory deal mainly with physic at the planck scale, although it's goal is to connect to with the electroweak scale. On the other hand, nonotehcnology, deals with physics at sizes similar to the Bohr radius. There are, consequently, many orders of magnitude of difference among that two branches of physics. Because of that it is absolutely amazing to see in the title of the paper a referenceJavierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com0tag:blogger.com,1999:blog-34983191.post-6119607348416934072011-01-27T09:44:00.004+01:002011-01-27T10:37:15.936+01:00Two cosmology papes and the question of extra dimensionsFirst an advert, the two topics are unrelated, well, or may be not ;). The first paper I would want to mention is this form Luis Alvarez Gaumé. Gaumé is one of the best known spanish string theorists. He is famous for the 80's paper with Witten about the (absence of) anomalies in string theory. Now he has a paper in arxiv. A Minimal Inflation Scenario. This is the abstract: We elaborate on a Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com3tag:blogger.com,1999:blog-34983191.post-37317699045864676952010-12-20T09:49:00.002+01:002010-12-20T09:55:32.789+01:00The ADSC/CFT bibleToday in arxiv has appeared something that I had never seen before, a whole collection of review articles devoted to a single topic, the ADS/CFT. There is an "overview" article that serves as reference of the others: Review of AdS/CFT Integrability: An Overview. If I haven't counted bad there are 23 articles. And this is a review!. Clearly that is an indication of the fact that AdS/CfT is a veryJavierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com2tag:blogger.com,1999:blog-34983191.post-91498862926400942342010-12-02T10:08:00.002+01:002010-12-02T11:15:07.962+01:00Behind the super event horizontThis is a very brief note to tell that I have not forgotten about the blog. There are a couple of combined reason for my long absence. Possible one of the most important ones is that my favourite (and expensive) wireless keyboard is out of work because it's USB connector seems to be slightly broken. Now I must return to writing with a wired keyboard, which is uncomfortable and it results in Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com0tag:blogger.com,1999:blog-34983191.post-75927241816975087392010-10-05T06:36:00.002+02:002010-10-05T07:38:49.787+02:00Where to hide a vacuum?This last mounth happened many interesting things and there were a few good papers. Possibly I´l mention some of them in the future, but today just want to write a brief entry about a pre-idea. The energy of vacuum is an ugly problem for QFT and string theory. Both in the theoretical side, the vacuum energy would be a lot greater than 0, and in the experimental side, the universe seems to be Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com1tag:blogger.com,1999:blog-34983191.post-89975302607746299222010-08-30T08:43:00.002+02:002010-08-30T10:03:48.425+02:00Verlinde videos on emergent gravityReading the kea's new blog I advertised that there were two videos of Verlinde talking about emergent gravity:1)KIPT video2) Perimeter video At the beginning of this summer Verlinde had announced it's presence in a string theory conference in Madrid but, unfortunately, at last he didn't assist. Because of that I was curious to see in video what I missed in direct and looked at the first of the Javierhttp://www.blogger.com/profile/17845977289427117418noreply@blogger.com2