Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quantum Gravity School - March 2007

  1. Dec 11, 2006 #1
    "[URL [Broken] First Quantum Geometry and Quantum Gravity School
    March 23 - April 3, 2007
    Zakopane, Poland[/URL]​

    Invited Lecturers: Jan Ambjorn, Abhay Ashtekar, Alain Connes*, Laurent Freidel, Shahn Majid, Martin Reuter, Hendryk Pfeiffer*, Jean-Marc Schlenker, Thomas Thiemann
    *-to be confirmed​
    Local organizer: Jerzy Lewandowski, Kirill Krasnov...

    The school will be held within the framework of the new ESF research network Quantum Geometry and Quantum Gravity, coordinated by John Barrett
    see http://www.maths.nottingham.ac.uk/qg/" [Broken] for further information about the network.

    The aim of the school is to provide an up-to-date introduction to
    the main research topics of the network, namely: loop quantum gravity,
    spin foam models, dynamical triangulations, matrix models, and the
    application of non-commutative geometry and quantum groups to quantum
    gravity. There will be funds to cover the expenses of some
    participants (especially PhD students or junior researchers) from the
    member countries of the network.

    :surprised I wait for more info :surprised
    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Dec 11, 2006 #2


    User Avatar
    Gold Member

    Hmm Barret is doing good work.
  4. Dec 11, 2006 #3
    Will it be recorded for us on the internet?
    Anybody that knows online lectures on gravity on Internet?
    I think I saw a link to three movies one moth ago in a thread named something like "What is the nowadays accepted gravitational theory?" but didnt find it in the shearch function.
  5. Dec 11, 2006 #4
    online lectures

    http://www.perimeterinstitute.ca/in...&task=view&id=113&Itemid=167&p=presentations" by Lee Smolin
    http://www.perimeterinstitute.ca/Scientific/Seminars/PIRSA/" [Broken]
    http://relativity.phys.lsu.edu/ilqgs/" [Broken] (slides&audio)
    http://loops05.aei.mpg.de/index_files/Programme.html" [Broken]
    and more... would it be enough by now? well, I've only mentioned some quantum gravity lectures, and more precisely some non-perturbative/background independent quantum gravity lectures...
    Have I answered to your question?

    ps: the tread you mentioned would be https://www.physicsforums.com/showthread.php?t=145164"
    Last edited by a moderator: May 2, 2017
  6. Dec 11, 2006 #5


    User Avatar
    Science Advisor
    Gold Member
    Dearly Missed

    Francesca it sounds very exciting!

    Arivero is right about John Barrett doing good work, in several ways.
    this QGQG research funding network seems exceptionally well-conceived

    I see 9 lecturers, and they have 9 or more days. So they can let each lecturer give a series of talks. They have time to listen a lot to each

    I will write down what I think are the specialties of each of the 9 lecturers in the school. It should be interesting to see what kind of mix Barrett and the QGQG and the organizers like Krasnov (who is at Nottingham with Barrett, I think) are putting together. I mean the MIX seems unusual to me. For each teacher in the school I will indicate a little where that person is and what kind of recent research---Francesca please correct me if I am wrong about any of them.

    Jan Ambjorn, (Utrecht) CDT causal dynamical triangulations---co-author of many CDT papers with Renate Loll--computer simulations of simplicial QG

    Abhay Ashtekar, (Penn State) LQG and especially lately LQC loop quantum cosmology, replacing cosm. singularity by big bounce--numerical (computer) work going back through the former singularity

    Alain Connes*, (Paris) NCG, realizing the standard model geometrically (John Barrett posted the same result simultaneously)

    Laurent Freidel, (Perimeter) Spinfoam, unifying Feynman diagrams with spinfoam, quantum groups, DSR deformed special relativity

    Shahn Majid, (London) NCG, quantum groups, recently co-authored with Freidel joining spinfoam with NCG

    Martin Reuter, (Mainz), QEG assymptotically safe "quantum Einstein gravity", curing the non-renormalizability of quantized conventional GR.

    Hendryk Pfeiffer*, (Cambridge) mathematician, Differential Geometry and Topology

    Jean-Marc Schlenker, (Toulouse) mathematician, Differential Geometry and Topology

    Thomas Thiemann, (Albert Einstein Institute-Golm) master constraint version of LQG, also AQG (algebraic QG).
    Last edited: Dec 11, 2006
  7. Dec 11, 2006 #6


    User Avatar
    Science Advisor
    Gold Member
    Dearly Missed

    Francesca, in that line-up of 9 teachers, I think it is only two (Laurent Freidel and Shahn Majid) who have been discussing prospects for near-term observational tests

    Majid, in http://arxiv.org/abs/hep-th/0604130 , just said flat out that GRB as observed by some mission like GLAST would afford a chance to test NCG.

    Do you know of any of the others being interested particular ideas for testing?

    The Majid quote is on page 2 of that paper.

    Majid: "...for a model of noncommutative 4D spacetime. Note that although (1)
    breaks usual Poincaré invariance, Special Relativity still holds as the quantum
    group ‘symmetry’. This is also the first noncommutative spacetime
    model with a genuine physical prediction
    [1], namely a variable speed of
    light (VSL). The NASA GLAST satellite to be launched in 2007 may among
    other things be able to test this prediction through a statistical analysis of
    gamma-ray bursts even in the worst case that we might expect for the parameter
    lambda approx. 10^−44 s ( the Planck timescale). Note that the model should not
    be confused with an earlier kappa-Poincaré group model[8] where..."
    Last edited: Dec 11, 2006
  8. Dec 12, 2006 #7
    Yes, thank you very much.
  9. Dec 12, 2006 #8
    Very, very, very interesting school!

    It's unfortunate, I cannot go. :cry: :cry: :cry: :cry:

  10. Dec 12, 2006 #9
    This school seems to me more devoted to formal developments than to their relationship with esperiments: maybe they see it as a subsequent step for the student...
    well, to tell the true I don't mind it...

    for Christine: thank you for the nice introduction to each listed speaker!
    Last edited: Dec 12, 2006
  11. Dec 12, 2006 #10
    Hi Francesca,

    No, that was Marcus' work!

    Thanks anyway for providing the link to the school!

  12. Dec 12, 2006 #11
    Sorry Marcus and thank you! I red too fast :blushing:
    well, in any case thanks to Christine who corrected me...
  13. Dec 12, 2006 #12
    Does anyone know if meetings like this establish a standard for Language used for presentations and discussions?
    Do they allow that to be dictated by the presenter of each topic, and for those that need it, how do they manage translations in a live environment?

    added - Just wanted to confirm what is only a guess on my part that English may be the spoken language standard. And to advance in science most must at least have English as a second launguage. (Thanks Marcus)
    Last edited: Dec 12, 2006
  14. Dec 12, 2006 #13
    Galileo said that Nature book is written in the mathematical language...
    sorry, I'm joking, that's to say that I find the spekers set quite homogeneous because they are all math-minded. Well, the school wants to present different approach even if they haven't achieved a common language, otherwise we eventually have the quantum gravity theory :rolleyes:
    Dear Randall, you put a proper question, different languages for the same thing are a bit disorienting, expecially for a student... what a mess!

    I'm wondering about the level of the school... they wrote it's addressed for graduate students, but...
  15. Dec 12, 2006 #14


    User Avatar
    Science Advisor
    Gold Member
    Dearly Missed

    I am guessing that Randall is asking about spoken language like English French Portuguese Italian German. Maybe he is talking about mathematics and technical definitions of terminology. But I don't think so.

    we are into a era of more mobility like in Renaissance when scholars could travel all over Europe---they all would read and write the same language Latin.

    You can see the video of all the presentations given at the Loops '05 conference (the largest Quantum Gravity conference so far). All the talks are in English although there are very few US people and not all that many from the UK. That conference was near Berlin at the Albert Einstein Institute in Golm.
    It is the usual international conference language in continental Europe. Also to some extent even for lectures, seminars, colloquium talks. So a student from some other country (Spain, Germany, Brazil, UK, Italy) can go to Utrecht in Holland and give seminar talks and study there without having to know Dutch!

    This is good for scholarship.
    Last edited: Dec 12, 2006
  16. Dec 17, 2006 #15


    User Avatar
    Science Advisor
    Gold Member
    Dearly Missed

    The list of lecturers to be at the school has changed slightly. for example Etera Livine (who wrote a review paper on COVARIANT LQG recently) will be lecturing and Hendryk Pfeiffer will not be. here is the updated list:

    Jan Ambjorn
    Abhay Ashtekar
    Alain Connes*
    Laurent Freidel
    Etera Livine
    Shahn Majid
    Martin Reuter
    Jean-Marc Schlenker
    Thomas Thiemann
    Ruth Williams*

    * - to be confirmed


    many people know the research these people do as well or better than I, so they don't need the list annotated, but I will give some guesses about what these people might talk about

    Jan Ambjorn---causal dynamical triangulation (CDT: one of several simplicial QG approaches)
    Abhay Ashtekar----(loop) quantum cosmology---the deterministic evolution that replaces the bang singularity
    Alain Connes*----obtaining the standard model from non-commutative geometry (NCG)
    Laurent Freidel----obtaining Feynman diagrams of usual QFT from spinfoam, the emergence of matter from QG.
    Etera Livine----covariant loop quantum gravity (CLQG)
    Shahn Majid----NCG---possible connection to DSR and GLAST testability.
    Martin Reuter----quantum Einstein gravity (QEG)---showing quantized general relativity to be assymptotically safe
    Jean-Marc Schlenker---differential geometry and topology (application?)
    Thomas Thiemann----algebraic quantum gravity (AQG) and/or the master constraint program
    Ruth Williams*----simplicial QG

    * - to be confirmed

    for more information:
    Last edited: Dec 17, 2006
  17. Dec 18, 2006 #16


    User Avatar

    Great, isn't it? ;)
  18. Dec 18, 2006 #17
    Yes, it is :tongue2:

    Are you going to come? and your colleagues from Marseille?
    Last edited: Dec 18, 2006
  19. Dec 18, 2006 #18


    User Avatar

    I fully intend to, but I'm actually in Nottingham now, so I don't know who from Marseille is coming...
    Will you be there? Are you studying QG?
  20. Dec 18, 2006 #19
    I worry about the level of lectures...
    I'm going to start my (master) thesis in QG next year, maybe starting from the Fall, so...
    I fully hope to come too, but maybe it's better if I ask before to my advisors...
  21. Dec 18, 2006 #20


    User Avatar

    In that case it might be below the expected level:

    "Please note, that if you are a Ph.D. student or a junior researcher we will also need a recommendation letter from a senior scientist. It should be send in PostScript or PDF format at e-mail address QGQG1 @ fuw.edu.pl."

    Either way I'd definately try for it, even if you don't learn that much, in my experience challenging yourself is always a good idea.
  22. Dec 18, 2006 #21

    :uhh: :uhh: :uhh: ​

  23. Feb 17, 2007 #22
    detailed programme

    It sounds scaring to me...

    Laurent Freidel: Spin-Foam Models
    1. General introduction to spin foams
    2. 3D Gravity and introduction to some group theory
    3. The Ponzano-Regge model derivation and its properties
    4. The Ponzano-Regge model + matter
    5. Effective field theory

    Paweł Kasprzak: Locally compact quantum Lorentz groups
    1. C*-algebras. (1h)
    a. Morphism of C*-algebras;
    b. C*-algebras generated by affiliated elements;
    c. W*-algebras.
    2. Locally compact quantum groups.(1h)
    a. Compact quantum groups of Woronowicz;
    b. From multiplicative unitary to locally compact quantum groups;
    c. Locally compact quantum groups of Kustermans and Vaes.
    3. Rieffel Deformation.(3h)
    a. Rieffel Deformation of C*-algebras;
    b. Rieffel Deformation of locally compact groups;
    c. Heisenberg-Lorentz quantum group;
    d. The second example of quantum Lorentz group obtained by Rieffel Deformation.
    4. Quantum codouble.(2h)
    a. Quantum Lorentz group having Gauss decomposition property;
    b. Quantum Lorentz group having Iwasawa decomposition property.

    Martin Reuter: Asymptotic Safety in Quantum Einstein Gravity
    The basic ideas of the Wilsonian renormalization group and its continuum implementation in terms of the effective average action are reviewed and its application to Quantum Einstein Gravity (QEG) is discussed. This approach is used then to explore the nonperturbative renormalizability (asymptotic safety) of QEG and the fractal-like nature of its effective spacetimes.

    Jean-Marc Schlenker: Hyperbolic geometry for 3d gravity
    - hyperbolic surfaces, complex surfaces, Teichmüller space
    - quadratic holomorphic differentials as the cotangent of Teichmüller space
    - measured geodesic lamination as another description of the cotangent of Teichmüller
    - Thurston's Earthquake theorem
    - quasifuchsian 3-dim hyperbolic manifolds, the Ahlfors-Bers theorem
    - 3-dim GHMC AdS manifolds
    - the Mess proof of the earthquake theorem through GHMC AdS manifolds.

    Ruth Williams: Introduction to Regge calculus
    1. Basic formalism; simplex practicalities; Bianchi identities; existence of diffeomorphisms; continuum limit.
    2. Regge calculus in 2 dimensions. Regge calculus in 3 dimensions; inclusion of matter; 2+1 Regge calculus and 't Hooft's approach. 3+1 Regge calculus; Sorkin evolution; Lund-Regge approach.
    3. Regge calculus in 4 dimensions; weak field calculations; simplicial minisuperspace and quantum cosmology; numerical simulations of discrete quantum gravity; matter; the measure.
    4. Regge calculus in a large number of dimensions. Area Regge calculus; motivation and problems; constraints; treating areas as basic variables; discontinous metrics.
  24. Feb 17, 2007 #23


    User Avatar

    :bugeye: :bugeye: :bugeye:


    Sounds like this is going to be fun :D
  25. Feb 17, 2007 #24
    I use to be a plier in this kind of occasion, I'm going to attend all the lectures!
    I don't know so much about everything, so maybe I can take advantage
    just on hearing a bit of all subjects... :shy:
    I'm quite aware of the works by peoples who Marcus pointed out,
    what about the others, the more mathematical side of the school?
    Does someone have any advice? :wink:
    Last edited: Feb 17, 2007
  26. Feb 18, 2007 #25
    I'm Rick, one of the local organizers :)
    There is one more hot news from today - Carlo Rovelli will also participate as lecturer. So, the current list of speakers and lectures is the following:

    Jan Ambjorn - Matrix models in non-critical string theory and quantum gravity
    Abhay Ashtekar - Loop Quantum Cosmology
    Laurent Freidel - Spin-Foam Models
    Etera Livine - Spinfoams: The Barrett-Crane model in 4D and group field theory
    Paweł Kasprzak - Locally compact quantum Lorentz groups
    Martin Reuter - Asymptotic Safety in Quantum Einstein Gravity
    Carlo Rovelli - Carlo Rovelli: Where are we in the path toward quantum gravity?
    Jean-Marc Schlenker - Hyperbolic geometry for 3d gravity
    Thomas Thiemann - Loop Quantum Gravity
    Ruth Williams - Introduction to Regge Calculus

    Unfortunately, there were more than 100 people asking for support and we had funds from ESF for support only about 35 :(
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook