tag:blogger.com,1999:blog-6912603287930240451Tue, 12 Apr 2016 03:52:08 +0000generalinformationquantizationfunction fieldsmultimedianumber theorynumber-theoryNoncommutative Geometryhttp://noncommutativegeometry.blogspot.com/noreply@blogger.com (Arup)Blogger108125tag:blogger.com,1999:blog-6912603287930240451.post-2967166869306899905Sat, 26 Mar 2016 23:33:00 +00002016-03-26T23:41:53.496+00:00An indirect consequence of the famous Lucas congruence...So, in the course of function field arithmetic, one runs into the binomial coefficients (like one does most everywhere in mathematics); or rather the coefficients modulo a prime p. The primary result about binomial coefficients modulo p is of course the congruence of Lucas. In function field arithmetic
one seems to be unable to avoid the group obtained by permuting p-adic (or q-adic) coefficientshttp://noncommutativegeometry.blogspot.com/2016/03/an-indirect-consequence-of-famous-lucas.htmlnoreply@blogger.com (David Goss)0tag:blogger.com,1999:blog-6912603287930240451.post-4082701438425790031Sun, 22 Nov 2015 20:51:00 +00002015-12-11T16:41:57.120+00:00Review of "Arithmetic of characteristic p special L-values" by B. Anglès and L. TaelmanBruno Anglès and Lenny Taelman have published a profound study of finite characteristic special values as listed in the title. This appeared in Proc. London Math. Soc. (3) 110 (2015) 1000-1032. The analogy with classical theory is clear throughout the paper, as well as some potentially interesting differences; these results bode very well for the future of the subject. I have written a long http://noncommutativegeometry.blogspot.com/2015/11/review-of-arithmetic-of-characteristic.htmlnoreply@blogger.com (David Goss)0tag:blogger.com,1999:blog-6912603287930240451.post-4594289040238526321Fri, 30 Oct 2015 19:42:00 +00002015-10-31T00:29:48.212+00:00C. Armana's Formula for the coefficients of $h$
(full pdf is at https://drive.google.com/file/d/0BwCbLZazAtweOC01dFgyQjBmUlU/view?usp=sharing)
http://noncommutativegeometry.blogspot.com/2015/10/c-armanas-formula-for-coefficients-of-h.htmlnoreply@blogger.com (David Goss)0tag:blogger.com,1999:blog-6912603287930240451.post-77633652230312782Tue, 11 Aug 2015 19:53:00 +00002015-08-11T19:53:45.708+00:00Grand Unification in the Spectral Pati-Salam Model
Last week we (Chamseddine-Connes-van Suijlekom) posted a preprint on grand unification in the spectral Pati–Salam model which I summarize here (and here).
The paper builds on two recent discoveries in the noncommutative geometry approach to particle physics: we showed
how to obtain inner fluctuations of the metric without having to
assume the order one condition on the Dirac operator. http://noncommutativegeometry.blogspot.com/2015/08/grand-unification-in-spectral-pati.htmlnoreply@blogger.com (Walter)0tag:blogger.com,1999:blog-6912603287930240451.post-4236613683236361490Sat, 18 Jul 2015 22:26:00 +00002015-07-18T22:26:54.789+00:00Uffe HaagerupUffe Haagerup was a wonderful man, with a perfect kindness and openness of mind, and a mathematician of incredible power and insight.
His whole career is a succession of amazing achievements and of decisive and extremely influential contributions to the field of operator algebras, C*-algebras and von Neumann algebras.
His first work (1973-80) concerned the theory of weights and more generally http://noncommutativegeometry.blogspot.com/2015/07/uffe-haagerup.htmlnoreply@blogger.com (Alain Connes)1tag:blogger.com,1999:blog-6912603287930240451.post-6203938698083999768Sat, 18 Jul 2015 22:25:00 +00002015-07-18T22:27:51.872+00:00Daniel KastlerDaniel Kastler played for many many years a key role as a leading Mathematical Physicist in developing Algebraic Quantum Field Theory. He laid the foundations of the subject as the famous
"Haag-Kastler" axioms in his joint paper with Rudolf Haag in 1964. He gathered around him, in Bandol, a whole international school of mathematicians and physicists. With the devoted help of his beloved wife http://noncommutativegeometry.blogspot.com/2015/07/daniel-kastler.htmlnoreply@blogger.com (Alain Connes)0tag:blogger.com,1999:blog-6912603287930240451.post-2033499942621363866Sat, 18 Jul 2015 20:50:00 +00002015-07-18T20:50:02.605+00:00Two great lossesIt is with incommensurable sadness that we learned of the death of two great figures of the fields of operator algebras and mathematical physics.
Daniel Kastler died on July 4-th in his house in Bandol.
Uffe Haagerup died on July 5-th in a tragic accident while swimming near his summer house in Denmark.
I will write on each of them separately.
http://noncommutativegeometry.blogspot.com/2015/07/two-great-losses.htmlnoreply@blogger.com (Alain Connes)0tag:blogger.com,1999:blog-6912603287930240451.post-6165547310508665931Fri, 02 Jan 2015 17:45:00 +00002015-01-02T17:45:42.093+00:00QUANTA OF GEOMETRYThis is a short update on the post called "particles in quantum gravity",
there were interesting comments and rather than answering them in the
blog i just want to point to a long and detailed talk which I gave in the
Hausdorff Institute in Bonn in December and which is now available on YouTube.
In any case this is a good occasion to wish you all a
HAPPY NEW YEAR 2015!http://noncommutativegeometry.blogspot.com/2015/01/quanta-of-geometry.htmlnoreply@blogger.com (Alain Connes)3tag:blogger.com,1999:blog-6912603287930240451.post-2614291761045744300Fri, 12 Dec 2014 02:27:00 +00002014-12-17T22:09:33.320+00:00The Digit Principlehttp://noncommutativegeometry.blogspot.com/2014/12/the-digit-principle.htmlnoreply@blogger.com (David Goss)0tag:blogger.com,1999:blog-6912603287930240451.post-3358862930369800100Sun, 09 Nov 2014 16:36:00 +00002014-11-09T16:36:53.317+00:00PARTICLES IN QUANTUM GRAVITYThe purpose of this post is to explain a recent discovery that we did with my two physicists collaborators Ali Chamseddine and Slava Mukhanov. We wrote a long paper Geometry and the Quantum: Basics which we put on the arXiv, but somehow I feel the urge to explain the result in non-technical terms.
The subject is the notion of particle in Quantum Gravity. In particle physics there is a well http://noncommutativegeometry.blogspot.com/2014/11/particles-in-quantum-gravity.htmlnoreply@blogger.com (AC)7tag:blogger.com,1999:blog-6912603287930240451.post-7863427945059385338Tue, 26 Aug 2014 12:39:00 +00002014-08-26T12:39:38.352+00:00Differentiation and the missing Kummer congruencehttp://noncommutativegeometry.blogspot.com/2014/08/differentiation-and-missing-kummer_26.htmlnoreply@blogger.com (David Goss)0tag:blogger.com,1999:blog-6912603287930240451.post-8186937556545003679Wed, 13 Aug 2014 03:04:00 +00002014-08-13T03:04:53.944+00:00Fields Medals 2014: Maryam Mirzakhani, Martin Hairer, Manjul Bhargava, Artur AvilaCongratulations to all 2014 Fields medalists! Very well deserved and also really nice to see a woman wining a Fields medal for the first time ever (and of course I am specially delighted that she has the same undergraduate alma mater, Sharif University, as I! Quanta magazine has a coverage of all four winners Avila, Bhargava, Hairer, Mirzakhani.
It was a bit unusual to see the results http://noncommutativegeometry.blogspot.com/2014/08/fields-medals-2014-maryam-mirzakhani.htmlnoreply@blogger.com (Masoud Khalkhali)0tag:blogger.com,1999:blog-6912603287930240451.post-3361153202997675655Sat, 05 Jul 2014 19:03:00 +00002014-08-05T14:49:54.872+00:00Lectures on VideoI would like to draw your attention to the following lectures just posted on youtube
1. Alain Connes: Arithmetic Site
Update: and a related interview where some of the relevant ideas in topos theory and the impact of Grothendieck is discussed.
2. Ali Chamseddine: Spectral Geometric Unification
http://noncommutativegeometry.blogspot.com/2014/07/lectures-on-video.htmlnoreply@blogger.com (Masoud Khalkhali)0tag:blogger.com,1999:blog-6912603287930240451.post-3122301515032070807Thu, 05 Jun 2014 13:30:00 +00002014-06-05T13:30:40.745+00:00Announcement book "Noncommutative Geometry and Particle Physics" by Walter van Suijlekom
My book "Noncommutative Geometry and Particle Physics" is due to appear this summer with Springer:
This textbook provides an introduction to noncommutative geometry and presents a
number of its recent applications to particle physics. It is intended
for graduate students in mathematics/theoretical physics who are new to
the field of noncommutative geometry, as well as for researchers in
http://noncommutativegeometry.blogspot.com/2014/06/announcement-book-noncommutative.htmlnoreply@blogger.com (Walter)0tag:blogger.com,1999:blog-6912603287930240451.post-6695937422549168765Wed, 04 Jun 2014 13:11:00 +00002014-06-04T13:11:54.254+00:00Quotes from Alain Connes' lecture on the spectral Standard Model at Radboud University Nijmegen
Alain Connes: “Change of paradigm unit of length” (video)
Alain Connes: “What is a noncommutative space and its group of symmetries” (video)
Alain Connes: “Spectral action, Yang-Mills theory” (video)
Alain Connes: “Derivation of the Standard Model from noncommutative geometry” (video)
http://noncommutativegeometry.blogspot.com/2014/06/quotes-from-alain-connes-lecture-on.htmlnoreply@blogger.com (Walter)0tag:blogger.com,1999:blog-6912603287930240451.post-278796084419870803Tue, 18 Mar 2014 18:46:00 +00002014-03-18T20:20:44.765+00:00Review of a paper by Gebhard Boeckle and the group S_(q)
So this post is a bit of an experiment. My friends at Math Reviews recently sent me a really interesting Math. Z. paper by Gebhard Boeckle. I spent some time reviewing it and found it contained very interesting results and calculations that pointed, yet again, to some possible underlying action of the group $S_{(q)}$ that I have discussed in other posts here. If you combine it with the new http://noncommutativegeometry.blogspot.com/2014/03/review-of-paper-by-gebhard-boeckle-and.htmlnoreply@blogger.com (David Goss)0tag:blogger.com,1999:blog-6912603287930240451.post-3903354402871787647Tue, 04 Feb 2014 01:53:00 +00002014-02-18T12:54:32.575+00:00zeta zeroes AND gamma polesThe arithmetic of function fields over finite fields has always been a ``looking-glass'' window into the standard arithmetic of number fields, varieties, motives etc.; sort of ``life based on silicon'' as opposed to the classical ``carbon-based'' complex-valued constructions. It has constantly amazed me, and frankly given me great pleasure, to see the way that analogies always seem to work out inhttp://noncommutativegeometry.blogspot.com/2014/02/zeta-zeroes-and-gamma-poles.htmlnoreply@blogger.com (David Goss)0tag:blogger.com,1999:blog-6912603287930240451.post-8932990613757973222Sun, 08 Sep 2013 18:22:00 +00002013-09-08T18:22:56.125+00:00Trimester program on Non-commutative Geometry and its Applications
From September-December 2014 there will be a trimester program on Non-commutative Geometry and its Applications at the Hausdorff Research Institute for Mathematics.
There will be four workshops during the trimester:
September 15-19, Non-commutative geometry's interactions with mathematics.
September 22-26, Quantum physics and non-commutative geometry.
November 24-28, Number theory and http://noncommutativegeometry.blogspot.com/2013/09/trimester-program-on-non-commutative.htmlnoreply@blogger.com (Walter)0tag:blogger.com,1999:blog-6912603287930240451.post-2753461967115822707Thu, 05 Sep 2013 01:38:00 +00002013-09-05T01:38:57.437+00:00Analytic continuation in the blogosphere....Hi. For those interested, I have started another blog at http://dmgoss.wordpress.com/ to cover items that are probably not appropriate (too technical, specialized, etc.) for this wonderful blog.... Best, Davidhttp://noncommutativegeometry.blogspot.com/2013/09/analytic-continuation-in-blogosphere.htmlnoreply@blogger.com (David Goss)0tag:blogger.com,1999:blog-6912603287930240451.post-6628586679337708619Fri, 23 Aug 2013 07:55:00 +00002013-08-23T07:55:25.004+00:00Website Noncommutative Geometry and Particle Physics
A new website on noncommutative geometry has been created, connected to the workshop Noncommutative Geometry and Particle Physics organized at the Lorentz Centre in Leiden in October 2013. As this type of workshop only allows for a limited number of participants, this website will form the virtual portal for a wider audience.
It will contain updates during the workshop, documents http://noncommutativegeometry.blogspot.com/2013/08/website-noncommutative-geometry-and.htmlnoreply@blogger.com (Walter)1tag:blogger.com,1999:blog-6912603287930240451.post-6673466554412267563Tue, 09 Jul 2013 19:58:00 +00002013-07-16T17:08:37.374+00:00A-expansionsAs I have written about before, the integers Z play a dual role in arithmetic. On the one hand, they are obviously scalars in terms of the fields of definitions of varieties etc.; yet, on the other hand, they are also operators, as in the associated Z-action on multiplicative groups (or the groups of rational points of abelian varieties etc.). This is absolutely so basic that we do not notice it http://noncommutativegeometry.blogspot.com/2013/07/a-expansions.htmlnoreply@blogger.com (David Goss)4tag:blogger.com,1999:blog-6912603287930240451.post-6968793899696405243Fri, 19 Apr 2013 01:37:00 +00002013-04-23T15:24:46.419+00:00Wronski, Vandermonde, and Moore!This post is based on a recent letter by Matt Papanikolas outlining some results he has discovered whilst writing a (highly anticipated!) monograph on $L$-values in finite characteristic. In staring at Matt's letter, I realized that he allowed one to relate the big 3 matrices (Wronski, Vandermonde and Moore) in one simple formula which I will present below and then pose a related question.
I http://noncommutativegeometry.blogspot.com/2013/04/wronski-vandermonde-and-moore_19.htmlnoreply@blogger.com (David Goss)1tag:blogger.com,1999:blog-6912603287930240451.post-5671190552529814617Mon, 28 Jan 2013 01:19:00 +00002013-01-28T01:19:53.055+00:00Informal video series on the Carlitz moduleDear All: My student, Rudy Perkins, and his fellow graduate student, Tim All, are creating an informal video lecture series on the Carlitz module. If you are interested, please check out http://rudyperkins.wordpress.com/ . Davidhttp://noncommutativegeometry.blogspot.com/2013/01/informal-video-series-on-carlitz-module.htmlnoreply@blogger.com (David Goss)0tag:blogger.com,1999:blog-6912603287930240451.post-1809358535782978847Thu, 17 Jan 2013 20:40:00 +00002013-01-17T20:40:20.891+00:00CYCLIC HOMOLOGY AND ARITHMETICCyclic homology has recently revealed its potential in
relation to the description of Serre's Archimedean local factors in the
Hasse-Weil L-function of an arithmetic variety as shown in the paper by
A. Connes and C. Consani : Cyclic homology, Serre's local factors and the lambda-operations.
The elaboration of this topic constitutes one of the two leading themes
of the course that AC is http://noncommutativegeometry.blogspot.com/2013/01/cyclic-homology-and-arithmetic.htmlnoreply@blogger.com (AC)0tag:blogger.com,1999:blog-6912603287930240451.post-1941132621896146173Tue, 30 Oct 2012 17:14:00 +00002012-11-21T13:00:43.176+00:00THE MUSIC OF SPHERESThe title of this post, the music of spheres, refers to a talk The music of shapes which I gave in Lille, on the 26th of September, on the occasion of a joint meeting with the Fields Institute. The talk is an introduction to the spectral aspect of noncommutative geometry and its implications in physics.
The starting point is the naive question "Where are we?", or how is it possible to communicatehttp://noncommutativegeometry.blogspot.com/2012/10/the-music-of-spheres.htmlnoreply@blogger.com (AC)5