📄 The Fate of Ernst Ising and the Fate of his Model
Thomas Ising, Reinhard Folk, Ralph Kenna, Bertrand Berche, Yurij Holovatch
🔗 https://arxiv.org/pdf/1706.01764
📌 ABSTRACT
On this, the occasion of the 20th anniversary of the "Ising Lectures" in Lviv (Ukraine), we give some personal reflections about the famous model that was suggested by Wilhelm Lenz for ferromagnetism in 1920 and solved in one dimension by his PhD student, Ernst Ising, in 1924. That work of Lenz and Ising marked the start of a scientific direction that, over nearly 100 years, delivered extraordinary successes in explaining collective behaviour in a vast variety of systems, both within and beyond the natural sciences. The broadness of the appeal of the Ising model is reflected in the variety of talks presented at the Ising lectures ( http://www.icmp.lviv.ua/ising/ ) over the past two decades but requires that we restrict this report to a small selection of topics. The paper starts with some personal memoirs of Thomas Ising (Ernst's son). We then discuss the history of the model, exact solutions, experimental realisations, and its extension to other fields.
Thomas Ising, Reinhard Folk, Ralph Kenna, Bertrand Berche, Yurij Holovatch
🔗 https://arxiv.org/pdf/1706.01764
📌 ABSTRACT
On this, the occasion of the 20th anniversary of the "Ising Lectures" in Lviv (Ukraine), we give some personal reflections about the famous model that was suggested by Wilhelm Lenz for ferromagnetism in 1920 and solved in one dimension by his PhD student, Ernst Ising, in 1924. That work of Lenz and Ising marked the start of a scientific direction that, over nearly 100 years, delivered extraordinary successes in explaining collective behaviour in a vast variety of systems, both within and beyond the natural sciences. The broadness of the appeal of the Ising model is reflected in the variety of talks presented at the Ising lectures ( http://www.icmp.lviv.ua/ising/ ) over the past two decades but requires that we restrict this report to a small selection of topics. The paper starts with some personal memoirs of Thomas Ising (Ernst's son). We then discuss the history of the model, exact solutions, experimental realisations, and its extension to other fields.
📄 How and why does statistical mechanics work?
Navinder Singh (2011)
🔗 https://arxiv.org/pdf/1103.4003
📌 ABSTRACT
As the noscript says we want to answer the question; how and why does statistical mechanics work? As we know from the most used prenoscription of Gibbs we calculate the phase space averages of dynamical quantities and we find that these phase averages agree very well with experiments. Clearly actual experiments are not done on a hypothetical ensemble they are done on the actual system in the laboratory and these experiments take a finite amount of time. Thus it is usually argued that actual measurements are time averages and they are equal to phase averages due to ergodicity. Aim of the present review is to show that ergodicity is not relevant for equilibrium statistical mechanics (with Tolman and Landau). We will see that the solution of the problem is in the very peculiar nature of the macroscopic observables and with the very large number of the degrees of freedom involved in macroscopic systems as first pointed out by Khinchin. Similar arguments are used by Landau based upon the approximate property of "Statistical Independence". We review these ideas in detail and in some cases present a critique. We review the role of chaos (classical and quantum) where it is important and where it is not important. We criticise the ideas of E. T. Jaynes who says that the ergodic problem is conceptual one and is related to the very concept of ensemble itself which is a by-product of frequency theory of probability, and the ergodic problem becomes irrelevant when the probabilities of various micro-states are interpreted with Laplace-Bernoulli theory of Probability (Bayesian viewpoint). In the end we critically review various quantum approaches (quantum-statistical typicality approaches) to the foundations of statistical mechanics.
Navinder Singh (2011)
🔗 https://arxiv.org/pdf/1103.4003
📌 ABSTRACT
As the noscript says we want to answer the question; how and why does statistical mechanics work? As we know from the most used prenoscription of Gibbs we calculate the phase space averages of dynamical quantities and we find that these phase averages agree very well with experiments. Clearly actual experiments are not done on a hypothetical ensemble they are done on the actual system in the laboratory and these experiments take a finite amount of time. Thus it is usually argued that actual measurements are time averages and they are equal to phase averages due to ergodicity. Aim of the present review is to show that ergodicity is not relevant for equilibrium statistical mechanics (with Tolman and Landau). We will see that the solution of the problem is in the very peculiar nature of the macroscopic observables and with the very large number of the degrees of freedom involved in macroscopic systems as first pointed out by Khinchin. Similar arguments are used by Landau based upon the approximate property of "Statistical Independence". We review these ideas in detail and in some cases present a critique. We review the role of chaos (classical and quantum) where it is important and where it is not important. We criticise the ideas of E. T. Jaynes who says that the ergodic problem is conceptual one and is related to the very concept of ensemble itself which is a by-product of frequency theory of probability, and the ergodic problem becomes irrelevant when the probabilities of various micro-states are interpreted with Laplace-Bernoulli theory of Probability (Bayesian viewpoint). In the end we critically review various quantum approaches (quantum-statistical typicality approaches) to the foundations of statistical mechanics.
⭕️ Inspired by Laszlo Barabasi's award talk at CCS 2017 in Cancun, a small group of Twitter users have started discussing the idea to create "Complexity Literacy", a list of core ideas that should be taught/learned in Complexity / Complex Systems courses.
🔗 https://docs.google.com/forms/d/e/1FAIpQLSeWUfPNyjC1-_NeHfHWIl0IXwhnWntdTuwhKKLxgWHv-UmWjA/viewform
You can find a similar effort in Network Science here => http://tinyurl.com/networkliteracy.
This form is to initiate an initial brainstorming process by collecting various ideas from the Complex Systems community at large. Please identify yourself so we can contact you for further discussions in the future!
Hiroki Sayama (sayama@binghamton.edu)
🔗 https://docs.google.com/forms/d/e/1FAIpQLSeWUfPNyjC1-_NeHfHWIl0IXwhnWntdTuwhKKLxgWHv-UmWjA/viewform
You can find a similar effort in Network Science here => http://tinyurl.com/networkliteracy.
This form is to initiate an initial brainstorming process by collecting various ideas from the Complex Systems community at large. Please identify yourself so we can contact you for further discussions in the future!
Hiroki Sayama (sayama@binghamton.edu)
Google Docs
Complexity Literacy Brainstorming Form
Inspired by Laszlo Barabasi's award talk at CCS 2017 in Cancun, a small group of Twitter users have started discussing the idea to create "Complexity Literacy", a list of core ideas that should be taught/learned in Complexity / Complex Systems courses. You…
هفتهی آینده، هفتهی نوبل است. اعلام نام برندگان از روز دوشنبه و با جایزهی پزشکی شروع خواهد شد.
برندگان (یا برندهی) نوبل فیزیک، روز سهشنبه، و در زودترین زمان ساعت ۱۳:۱۵ به وقت تهران مشخص خواهند شد. معنای در زودترین زمان این است که تاخیر قابل قبول است. برای نمونه در سال ۲۰۱۳ که پیتر هیگز و فرانسیس انگلارت جایزه را بردند، آکادمی نوبل در حدود ۲ ساعت تاخیر داشت.
برندگان (یا برندهی) نوبل فیزیک، روز سهشنبه، و در زودترین زمان ساعت ۱۳:۱۵ به وقت تهران مشخص خواهند شد. معنای در زودترین زمان این است که تاخیر قابل قبول است. برای نمونه در سال ۲۰۱۳ که پیتر هیگز و فرانسیس انگلارت جایزه را بردند، آکادمی نوبل در حدود ۲ ساعت تاخیر داشت.
🎞 Classic models in #nonequilibrium statistical physics
Sidney Redner, Boston University
🔗 Videos of the 4 Lectures:
1️⃣ https://www.aparat.com/v/Jb3lN
2️⃣ https://www.aparat.com/v/Zi4af
3️⃣ https://www.aparat.com/v/2YOif
4️⃣ https://www.aparat.com/v/2RGj4
Sidney Redner, Boston University
🔗 Videos of the 4 Lectures:
1️⃣ https://www.aparat.com/v/Jb3lN
2️⃣ https://www.aparat.com/v/Zi4af
3️⃣ https://www.aparat.com/v/2YOif
4️⃣ https://www.aparat.com/v/2RGj4
آپارات
Classic models in nonequilibrium statistical physics I - Sid Redner
Presented by: Sidney Redner, Boston University
Lecture 1 of 4 in Series
Hits from Scivee.tv prior to youtube upload : 4131
Lecture 1 of 4 in Series
Hits from Scivee.tv prior to youtube upload : 4131
💲 "Study the brain in the heart of Europe": a new call for applications of the International Max Planck Research School for Neural Circuits (deadline: December 1, 2017). See also www.imprs.brain.mpg.de
🏅 2017 Nobel Prize in Physics
https://www.nobelprize.org/nobel_prizes/physics/laureates/2017/press.html
The Nobel Prize in Physics 2017 was divided, one half awarded to Rainer Weiss, the other half jointly to Barry C. Barish and Kip S. Thorne "for decisive contributions to the LIGO detector and the observation of gravitational waves".
https://www.nobelprize.org/nobel_prizes/physics/laureates/2017/press.html
The Nobel Prize in Physics 2017 was divided, one half awarded to Rainer Weiss, the other half jointly to Barry C. Barish and Kip S. Thorne "for decisive contributions to the LIGO detector and the observation of gravitational waves".
NobelPrize.org
The Nobel Prize in Physics 2017
The Nobel Prize in Physics 2017 was divided, one half awarded to Rainer Weiss, the other half jointly to Barry C. Barish and Kip S. Thorne "for decisive contributions to the LIGO detector and the observation of gravitational waves"
🎞 Video lectures for Nonlinear Dynamics & Chaos taught in 2017 stream free here:
https://www.youtube.com/channel/UCBKOMCUz9OuWJOSZ_oPZmDw
https://www.youtube.com/channel/UCBKOMCUz9OuWJOSZ_oPZmDw
کمیتههای نوبل ادبیات و صلح به واقع مصداق بارزی از سیستمهای پیچیده هستند که هیچ کسی حکمت کارهاشون رو نمیفهمه.
امروز، برندهی نوبل ادبیات ساعت ۱ به وقت اروپا که می کنه ۲:۳۰ تهران معرفی خواهد شد.
طبق معمول هم سر زبانها امثال موراکامی، فیلیپ راث و امثالهم هستند. اما خب کمیته نشون داده همیشه میتونه سورپریزمون کنه.
امروز، برندهی نوبل ادبیات ساعت ۱ به وقت اروپا که می کنه ۲:۳۰ تهران معرفی خواهد شد.
طبق معمول هم سر زبانها امثال موراکامی، فیلیپ راث و امثالهم هستند. اما خب کمیته نشون داده همیشه میتونه سورپریزمون کنه.