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#19
Sep1805, 12:56 AM

Sci Advisor
PF Gold
P: 9,380

Day 1 looks like dynamite. Many interesting papers.



#20
Sep1905, 11:54 PM

Astronomy
Sci Advisor
PF Gold
P: 23,114

Speaker: Prof. Jerzy Lewandowski
Title: Loop Quantum Gravity Speaker: Dr. Alejandro Corichi Title: Towards semiclassical physical states in LQG Speaker: Dr. Rainer Verch Title: Generally covariant quantum field theory Speaker: Prof. Rodolfo Gambini Title: Consistent discretizations of totally constrained systems Speaker: Prof. Yongge Ma Title: On the Master Constraint Operator for Loop Quantum Gravity Speaker: Dr. Hanno Sahlmann Title: On the measure theory underlying LQG Speaker: Dr. Christian Fleischhack Title: Stonevon Neumann Theorem in Quantum Geometry In ordinary quantum mechanics Speaker: Dr. Jose A. Zapata Title: Loop quantization as a continuum limit Speaker: Kristina Giesel Title: Consistency Check on Volume and Triad Operator Quantisation in Loop Quantum Gravity Speaker: Bianca Dittrich Title: Partial and Complete Observables for Canonical General Relativity Speaker: Dr. Jorma Louko Title: Group averaging, positive definiteness and superselection sectors Speaker: Wayne Bomstad II Title: Linearized Gravity as the Rosetta Stone of Quantization Techniques Speaker: Hal Finkel Title: Stochastic Evolution of Graphs using Local Moves Speaker: Prof. Jorge Pullin Title: Classical applications of consistent discretizations Speaker: Dr. Gabriele Gionti Title: Discrete Theory of Gravity as a local Theory of the Poincare Group in the First Order Formalism Speaker: Dr. David Rideout Title: Spatial Hypersurfaces in Causal Set Cosmology Speaker: Dr. Sumati Surya Title: Recovering spacetime topology from a causet Speaker: Derek K. Wise Title: Discrete pform Electromagnetism as a Chain Field Theory Speaker: Stefan Zohren Title: Taming the cosmological constant in 2D causal quantum gravity with topology change Speaker: Prof. Manfred Droste Title: Universal homogeneous causal sets Speaker: Dr. JanMarkus Schwindt Title: Is there a minimal length in asymptotically safe quantum gravity? http://loops05.aei.mpg.de/index_file..._schwindt.html Thanks to Chronos for entering the list of talks for days 1 and 2. I was intrigued by the abstract of JM Schwindt's talkit refers to Martin Reuter QEG (assympt. safe quantum GR, "quantum Einstein gravity") which has a sequence of metrics appropriate for finer and finer resolution, and so a sequence of "microscopes" with which to view spacetime. And Schwindt has the surprising result that there is a limit on the resolution of angle. with nomatterhowfine a microscope one cannot see less than a certain angle. So he asks if there is a minimal length as well? weird. I did not expect this of Reuter QEG 


#21
Sep2005, 02:29 AM

Sci Advisor
PF Gold
P: 9,380

I saw that abstract too, marcus, and found it intriguing. There could be some really good things emerge from this conference. I am greatly encouraged some very fine string theorists are participating. Theorists should build more bridges than they burn. These people are gifted, brilliant and deserve to be heard. IMO, they all have a viable claim to a piece of the puzzle. A 'united we stand' sort of thing...



#22
Sep2405, 12:38 PM

Astronomy
Sci Advisor
PF Gold
P: 23,114

Chronos you started this and I think it is a good idea because seeing the talks listed like this lets one scan down and perhaps see some themes or shared ideas that one could otherwise have overlooked. So I will finish the listing by doing Friday 14 October talks. the source is
http://loops05.aei.mpg.de/index_files/Programme.html http://loops05.aei.mpg.de Speaker: Dr. Bernard L. Julia Title: Provisional title Dualization of gravity Speaker: Hugo A. MoralesTecotl Title: On the topdown approach to quantum gravity Speaker: Prof. Roy Maartens Title: COSMOLOGY AND QUANTUM GRAVITY Abstract: I will review the basic features of the standard, classical model of cosmology, which is based on General Relativity, and how this model accounts for observed properties of the universe. Modifications to General Relativity that are inspired by quantum gravity need to be tested against cosmological observations. This is one of the key tests for any candidate quantum gravity theory. I will discuss in general terms some of the difficulties involved in this aim, and what is needed from theorists in order to achieve this aim. In particular, I will compare some of the features of stringy cosmology and loop quantum cosmology. Speaker: Prof. Abhay Ashtekar Title: Quantum Geometry and Spacetime Singularities Abstract: General relativity provides a subtle and powerful interplay between gravity and geometry, thereby opening numerous possibilities for novel phenomena. However, this interplay also implies that the spacetime itself ends when the gravitational field becomes singular. In loop quantum gravity, the interplay is elevated to the quantum regime through quantum geometry. I will present examples which strongly suggest that the physical spacetime does not end at singularities. Quantum geometry can serve as a bridge between vast spacetime regions which are classically unrelated. Thus, contrary to one's initial intuition, ramifications of quantum geometry can reach far beyond the Planck regime. Speaker: Dr. Oliver Winkler Title: Quantum Black Holes I: Kinematics Abstract: We discuss a novel approach to a quantization of spherically symmetric black holes. We present the kinematical setup and focus in particular on a genuinely quantum definition of what a quantum black hole is which avoids fixing classical inputs such as boundaries a priori. Speaker: Prof. Viqar Husain Title: Quantum Black holes II: Dynamics Abstract: I will describe an approach to studying gravitational collapse in quantum gravity. The model studied is the spherically symmetric gravityscalar system, which is a 2D field theory. An ADM Hamiltonian formalism is utilised, together with an alternative quantisation scheme with similarities to loop quantum gravity. The calculational scheme allows an initial quantum state of matter and metric excitations to be followed to black hole formation, and beyond. Speaker: Dr. Stefan Hofmann Title: The Power Spectrum in Quantum Inflationary Cosmology Abstract: We analyze fluctuations of a generic scalar field around its vacuum state in a singularity free quantum cosmology... In this framework we calculate the power spectrum and discuss its leading imprint from a quantum inflationary stage. [my comment: concern with testing] Speaker: Johannes Brunnemann Title: Singularities in LQG: A Status Report Abstract: Loop Quantum Cosmology (LQC) has taken huge steps towards an answer to the question about sigularity (dis)appearence in a quantum theory of gravity. The results look very promising, however they are usually obtained within the framework of symmetry reduced and thus simplified models....[comment: concern with BB and BH singularities, work with Thiemann] Speaker: Dr. Leonardo Modesto Title: Disappearance of the Black Hole Singularity in Quantum Gravity Abstract: We apply techniques introduced in quantum cosmology to the Schwarzschild metric inside the horizon. The spacetime inside the horizon is the KantowskiSachs spacetime with space section of topology R x S^2. In particular, we use a minisuperspace quantization procedure suggested by Loop Quantum Gravity and based on an alternative to the Schroedinger representation. Using this quantization procedure, we show that the black hole singularity disappears and spacetime can be dynamically extended beyond the classical singularity. At this point we introduce the matter and we study the gravitational collapse of a star. We study the dynamic of the space time in the interior of the Schwarzschild radius. In particular in our simple model we obtain the evolution of the matter inside the star and of the gravity outside the region where the matter is present. When we impose the boundary condition between the two region we identify an unique time coordinate inside and outside the star. Speaker: Gregory Vereshchagin Title: From Semiclassical LQC to Friedmann Universe Abstract: I will discuss basic phenomenological consequences of modification of Friedmann's equations in the semiclassical LQC. Such aspects as cosmic singularity problem, size of the Universe, generation of initial conditions for inflation and constraints on parameters of inflationary models will be considered. [comment: all these COSMOLOGY papers held until Friday!] Speaker: Dr. Tomasz Pawlowski Title: Isotropic universe dynamics from selfadjoint form of Hamiltonian constraint in LQC Abstract: The selfadjoint form of the Hamiltonian constraint within Loop Quantum Cosmology framework is used to determine the evolution of an isotropic universe with massless scalar field. Its dynamics near classical bigbang singularity is analysed. In particular we are going to present the results on the evolution 'through' the singularity and analysis of the classicality of the universe reemerging from deep quantum region.[comment: a coauthor with Ashtekar, talking about the BB side of a BHbounce, more cosmology, refers to future paper by AshtekarPawlowskiSingh] Speaker: Dr. Marek Szydlowski Title: Dynamics of bouncing cosmological models [comment: more bounce] Speaker: Dr. Hector Hugo Hernandez Title: Anisotropic perturbations in Isotropic Loop Quantum Cosmology [comment: more cosmology] Speaker: Jonathan Engle Title: A full quantum theory and its symmetry reduction Abstract: In loop quantum cosmology, a key issue regards the relation of the reduced quantum model to the full quantum theory. In the ideal scenario, the reduced model is isomorphic to the ``symmetric sector'' of the full quantum theory... Speaker: Kevin Vandersloot Title: Phenomenological implications of discreteness in loop quantum cosmology Abstract: We discuss nonperturbative modifications to standard Friedmann dynamics implied by loop quantum cosmology. Particular focus is paid to effects arising from the discrete quantum geometry inherant in loop quantum cosmology. We show that these effects can imply bouncing behavior even in spatially flat models. We discuss the implications for pre bigbang and cyclic style models of string cosmology. Lastly we discuss how these effects can help provide sucessful initial conditions for inflation with a possibly measurable signature. [comment: I was always wondering about this! LQC seems to want the universe FINITE and only almost flat, not perfectly flat. But Kevin now says it may be flat. Good. I notice again a concern for testingan observable signature possibly in the Cosmic Microwave Background] Speaker: Dr. Daniel Cartin Title: Anisotropic homogeneous models in loop quantum cosmology Abstract: Loop quantum cosmology is a simplified version of the full quantum geometry program,... the Hamiltonian constraint becomes a partial difference equation acting on the wave function. ...are not straightforward to solve; we discuss generic methods that can be used, and present results for various specific cases. [Cartin works with Gaurav Khanna, they were both at Penn State. Khanna is at Dartmouth and does supercomputer, numerical relativity stuff. They have computational methods to contribute to LQG. Good idea IMHO] 


#23
Sep2405, 01:55 PM

Astronomy
Sci Advisor
PF Gold
P: 23,114

I want a simplified schedule I can remember:
Monday is Carloday Tuesday is Freidelday Wednesday is Lollday Thursday is Otherday (Rodolfo plus Jerzy et al on math. foundations) Friday is Abhayday 


#24
Sep2405, 06:47 PM

Sci Advisor
PF Gold
P: 9,380

Terno and Markopoulou are giving presentations based on quantum information theory on Monday [Markopoulouday on my calender]. I'm a big fan of QIT. FM's presentation should be quite interesting
Title: Erorrfree quantum gravity Abstract: We investigate the possibility that a background independent quantum theory of gravity is not a theory of quantum geometry. We provide a way for global spacetime symmetries to emerge from a background independent theory without geometry. In this, we use a quantum information theoretic formulation of quantum gravity and the method of noiseless subsystems in quantum error correction. This is also a method that can extract particles from a quantum geometric theory such as a spin foam model. Instead of the usual 'sum of geometries' approach to quantum gravity, FM is suggesting the geometry itself may be emergent. How is that for background independence? This appears to build upon a presentation from late 2004. Here's a link if anyone is interested: http://www.newton.cam.ac.uk/websemin...6/markopoulou/ 


#25
Sep2505, 12:11 AM

P: 408

Chronus, the above link you have provided is really,really interesting! Thanks 


#26
Oct605, 06:20 PM

P: 169

Hi 
You can see the transparencies of my talk at Loops '05 here: Towards a Spin Foam Model of Quantum Gravity I've changed the title from what appears in the program. I've also changed my abstract. Here it is: I refer to a bunch of papers in my talk, but you can more easily get to those papers from my webpage. My grad students Jeffrey Morton, Derek Wise and I are flying to Berlin this Saturday... this is gonna be fun! 


#27
Oct605, 06:22 PM

Astronomy
Sci Advisor
PF Gold
P: 23,114

be sure to ship us all the tidbits you can. it is an historical conference, and we crave news of it 


#28
Oct605, 06:29 PM

Astronomy
Sci Advisor
PF Gold
P: 23,114

my head is reeling slightly but it was not altogether unexpected Bravo! you will all have a great time for sure! 


#29
Oct605, 06:38 PM

Astronomy
Sci Advisor
PF Gold
P: 23,114

I have started on your lecture notes
they get hard around page 13 and interesting too I hope other people here at PF study your notes and we can make a collective effort of understanding I see that Tullio Regge is the hero of your pages 16, 17, 18 here's a picture http://www.cicap.org/enciclop/at101249.htm he's one of my heroes too. Tully (also the English nickname of Cicero) http://plagiarist.com/poetry/3381/ Yeats said about the other Tully Horace there by Homer stands, Plato stands below, And here is Tully's open page. How many years ago Were you and I unlettered lads Mad as the mist and snow? 


#30
Oct605, 07:06 PM

Astronomy
Sci Advisor
PF Gold
P: 23,114

darn it, Berislav
you should be going to Potsdam next week! but I guess you are busy beginning university studies, how do you like the university? 


#31
Oct605, 08:54 PM

Emeritus
PF Gold
P: 8,147

http://eir.library.utoronto.ca/rpo/display/poem265.html 


#32
Oct605, 09:10 PM

Emeritus
PF Gold
P: 8,147




#33
Oct605, 09:38 PM

Astronomy
Sci Advisor
PF Gold
P: 23,114

it is here http://math.ucr.edu/home/baez/loops05/ and you click on "Towards a..." and IIRC you get this pdf http://math.ucr.edu/home/baez/loops05/loops05.pdf In fact you may already have been looking at this (which he calls his slides) and were confused by my calling it "lecture notes" I didnt know that poem of Browning. It's good. BTW won't you take a look at this site. some of the best translations into English that there are on the web I think: http://www.brindin.com/main.htm the site has over a dozen excellent translators working on the greatest poetry in over a dozen languagesoften preserving some of the music (the rhyme, rhythm, general sound) of the original the editors are an English couple, both verse translators themselves. the English seem to be more in touch with the European verse tradition than we aremaybe it is oldfashioned education. this site really deserves to be widely known if you find some of the good stuff you will know what i mean ================ EDIT: I went to History and made a thread about it http://www.physicsforums.com/showthr...322#post777322 getting close to voices from the past is a way to approach the past 


#34
Oct605, 09:51 PM

P: 859




#36
Oct705, 03:57 PM

P: 169




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