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Topic: LQG

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	Loop quantum gravity - Wikipedia, the free encyclopedia
		Loop quantum gravity (LQG), also known as loop gravity and quantum geometry, is a proposed quantum theory of spacetime which attempts to reconcile the seemingly incompatible theories of quantum mechanics and general relativity.
		LQG may possibly be viable as a refinement of either gravity or geometry.
		LQG is a quantization of a classical Lagrangian field theory which is equivalent to the usual Einstein-Cartan theory in that it leads to the same equations of motion describing general relativity with torsion.
	en.wikipedia.org /wiki/Loop_quantum_gravity (3244 words)

	Talk:Loop quantum gravity - Wikipedia, the free encyclopedia
		LQG is affected especially, because it applies on a small scale to the weakest forces in nature.
		It is important and should be mentioned that LQG makes a testable prediction: speed of light is not constant but depends on the energy of the photon.
		I'm not enough of an expert on LQG to feel comfortable changing this article myself (and I don't want to be accused of waging a lone crusade against this stuff), but if anyone who has been active here agrees with my impressions of "Heim theory" then they might want to revert that recent edit.
	en.wikipedia.org /wiki/Talk:Loop_quantum_gravity (4212 words)

	Luboš Motl's reference frame: A very meaningful paper on loop quantum gravity
		But I am kind of afraid that the LQG community will ignore the paper - despite the fact that it is written in a very friendly tone - and continue their research "as usual".
		The situation in LQG does not seem to be any better than in geometrodynamics: there is no known Hilbert space on which the algebra is known to close.
		LQG is taken kind of seriously for sociological reasons - it has been given a lot of attention by media etc., at least in comparison with other ideas at a similar level of immaturity.
	motls.blogspot.com /2005/01/very-meaningful-paper-on-loop-quantum.html (3293 words)

	Not Even Wrong » Blog Archive » LQG for Skeptics
		It seems to me that to some extent LQG critics waste their time unless they not address LQG as a class of theories (including spin foam models) because when blanket statements are made one often has the impression that the critics lack a clear idea of what they are talking about.
		LQG used a quantization techinque which is fundamentally different than the approach we use to quantize all the field theories we understand.
		He likes the idea that all LQG people are using the same formalism(s), the same methods etc. I think it is a bad sign that says something about the intellectual breadth of the community, and this observation of limited technical resources has nothing to do with the physical coherence of the actual theory or theories.
	www.math.columbia.edu /~woit/wordpress/?p=330 (18166 words)

	GreenTruck: Hazardous Waste:The Large Quantity Generator
		Generation and Disposal: As a LQG, you are allowed to generate an unlimited amount of hazardous waste in any calendar month.
		All hazardous waste generated by the LQG that is not treated onsite must be manifested and sent to an offsite treatment, storage and disposal facility (TSDF) permitted to handle hazardous waste, or sent to an approved designated facility (e.g., a recycling facility).
		Storage/time limitations: LQGs are required to dispose their hazardous waste within 90 days of placing the waste into the container.
	www.greentruck.com /waste/1205.html (966 words)

	DPG Symposium 2004 \| The String Coffee Table
		Fleischhack discusses the step in LQG the analogue of which for the ‘LQG string’ is considered problematic by some people.
		I believe that the field of LQG would maybe profit from deemphasizing technical details at this point and instead emphasizing the big crucial point: The diffeomorphism constraints are ‘solved’ without imposing Dirac constraint quantization.
		LQG with matter is a framework where you pick some action functional of a spacetime theory, e.g.
	golem.ph.utexas.edu /string/archives/000330.html (7877 words)

	Robust Control System Design via Minimax LQG Control Theory
		Although the LQG controller design methodology provides a systematic way of synthesizing multi-input multi-output control systems in order to optimize the control system performance, this approach suffers from a major disadvantage in that it does not take into account the issue of robustness.
		The main aim of this project is to develop the theory of minimax LQG control to provide a practical control system design methodology which includes the previous modern control milestones of LQG control and H-infinity control.
		The class of stochastic uncertain systems which underlies the minimax LQG method is an extension of the Integral Quadratic Constraint (IQC) uncertainty description which generalizes the IQC uncertainty description to the stochastic case by replacing the IQC by a relative entropy constraint on the uncertainty.
	www.ee.adfa.edu.au /School/research/LQG_control.htm (748 words)

	Peter Fimmel's Physics Website
		If LQG is to be generalized so as to include electromagnetism it must bring with it the defining features of general relativity (GR).
		It is worth emphasising that in LQG the behaviour of a piece of spacetime is governed by local effects even though there may be no coordinates relating it to the background spacetime, which always remains everywhere.
		Space, in the discrete scheme, is quite different from that of LQG and yet it turns out to be both background independent and diffeomorphism invariant.
	home.it.net.au /~pjf/LQG.htm (1963 words)

	The Loop Quantum Gravity Group of NUS
		LQG unlike String Theory is notoriously difficult to be understood by beginners, because of various different and confusing notations used, deep and involved mathematical skills needed, very sparce novice-friendly resources and skipping of derivation steps in all review papers.
		We collect and arrange LQG references into a reading list for fresh graduate researchers to use.
		If you know or want to contribute a reference that is important to LQG research and easily accessible to fresh graduates, send it to us: kakarukeys@gmail.com.
	sps.nus.edu.sg /~wongjian/lqg.html (515 words)

	Carlo Rovelli: Quantum Gravity (review by Lubos Motl) (Site not responding. Last check: 2007-10-30)
		The failure of LQG to reproduce anything from physics of gravity (not even local Lorentz invariance) indicates that we are not probably allowed to impose these new periodicities.
		However, Rovelli seems to sell this obvious failure - the inability of LQG to predict anything new and/or explain the relations between anything we already know - as a good feature; in Chapter 10 he even uses the words "we did not have to unify gravity with other fields" as if unification were something undesirable.
		Even before the Polish physicists did their calculation, the connections between the LQG area quantum and the ringing modes were known to be highly problematic: the required constant log(3) only appeared in the neutral fl holes in 4 dimensions, but other fl holes were leading to a different constant or no constant at all.
	schwinger.harvard.edu /~motl/rovelli.html (5107 words)

	Thiemann's quantization of the Nambu-Goto action \| The String Coffee Table
		Since these are the same methods used in LQG for quantizing the gravitational field in 3+1 dimensions it is somewhat interesting to see how vastly different the results obtained this way are from the standard lore.
		It must therefore be emphasized that LQG is not canonical quantization in the sense that the classical first-class constraints are not promoted to hold as expectation value equations in the quantum theory.
		The LQG camp is well known for its high esteem of mathematical rigour and it would be very important to them to be made aware of a technical mistake.
	golem.ph.utexas.edu /string/archives/000299.html (8917 words)

	LQG makes predictions?
		My understanding of LQG is that they don`t know whether it can describe the universe at the low energies we see it today.
		It is argued that a number of LQG models require a slight energy-dependence of the speed of light.
		Researchers pursuing various LQG approaches are indeed making an effort to arrive at tests which could falsify some or all of the different LQG models.
	www.physicsforums.com /showthread.php?t=109136 (1104 words)

	LQG
		Controller performance analysis with LQG benchmark obtained under...
		LQG controller design using GUI: application to antennas and radio...
		LQGs maintain a copy of each signed manifest for 3 yr or until the LQG
	www.mongabay.com /reference/environment/LQG.html (227 words)

	Citebase - Hybrid LQG-Neural Controller for Inverted Pendulum System
		The failure free optimization process stipulated a relatively small region of the asymptotic stability of the neural controller, which is concentrated around the regulation point.
		The presented hybrid controller combines benefits of a genetically optimized neural controller and an LQG controller in a single system controller.
		High quality of the regulation process is achieved through utilization of the neural controller, while stability of the system during transient processes and a wide range of operation are assured through application of the LQG controller.
	citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:cs/0312003 (214 words)

	Semiconductors datasheet Parts begin by LQ Page1 (Site not responding. Last check: 2007-10-30)
		LQG 15 HN 6 N 8 J 02
		LQG 15 HN 7 N 5 J 02
		LQG 15 HN 8 N 2 J 02
	www.digchip.com /datasheets/parts/lq/parts_lq.php (1089 words)

	CDC2000 LQG (Site not responding. Last check: 2007-10-30)
		Based on a bank of reconfigurable LQG controllers, each designed for a particular combination of total faults, the reconfiguration consists in two operation modes.
		In the first mode a switching is invoked towards one of the pre-designed LQG controllers on the basis of the information about only the combination of total faults that is in effect.
		In cases of partial faults the second mode is practically an extension of the modified pseudo-inverse method.
	www.mm.anadolu.edu.tr /ieeecss/39cdc/CD00S16B.HTM (866 words)

	String Theory's & LQG's Successes
		There must be at least one String Theory or LQG paper out there that at least attempts the following unification in physics--the whole point of String Theory and LQG.
		There has never been a theory that has been better funded than String Theory--hundreds of millions--and throw in LQG, and I am 100% certain that thousands of the best and brightest mathematicians are accomplishing what they set out to do.
		Even if it falls short, there must be at least one String Theory or LQG paper out there that at least attempts the following unification in physics--the whole point of String Theory and LQG.
	physicsforums.com /showthread.php?t=105482 (1704 words)

	Caltech Control and Dynamical Systems Technical Reports - Optimal LQG Control Across a Packet-Dropping Link
		We extend the familiar LQG separation principle to this problem that allows us to solve this problem using a standard LQR state-feedback design, along with an optimal algorithm for propagating and using the information across the unreliable link.
		Further, the solution is appealing from a practical point of view because it can be implemented as a small modification of an existing LQG control design.
		You are granted permission for individual, educational, research and non-commercial reproduction, distribution, display and performance of this work in any format.
	resolver.caltech.edu /CaltechCDSTR:2004.007 (208 words)

	Semiconductors datasheet Parts begin by LQ Page2
		LQG 18 HN 4 N 7 S 00
		LQG 18 HN 6 N 8 J 00
		LQG 18 HN 8 N 2 J 00
	www.digchip.com /datasheets/parts/lq/parts_lq02.php (424 words)

	MapCruzin - Santa Cruz, CA Toxics
		PACIFIC BELL SANTA CRUZ CA Mail City & State: SAN JOSE CA Generator Status : Large Quantity Generator (LQG) Treatment, Storage & Disposal Status: None This handler is a hazardous waste transporter.
		PACIFIC BOATS INC SANTA CRUZ CA Generator Status : Large Quantity Generator (LQG) Treatment, Storage & Disposal Status: None This handler is a hazardous waste transporter.
		The 1989, 1991, and 1993 data years are available through this program.
	www.mapcruzin.com /scruztri/docs/scruz.htm (944 words)

	MapCruzin - Santa Cruz County Toxic Facilities - rcris
		PACIFIC BELL APTOS CA Mail City & State: SAN JOSE CA Generator Status : Large Quantity Generator (LQG) Treatment, Storage & Disposal Status: None This handler is a hazardous waste transporter.
		PACIFIC BELL BEN LOMOND CA Mail City & State: SAN JOSE CA Generator Status : Large Quantity Generator (LQG) Treatment, Storage & Disposal Status: None This handler is a hazardous waste transporter.
		PACIFIC BELL FELTON CA Mail City & State: SAN JOSE CA Generator Status : Large Quantity Generator (LQG) Treatment, Storage & Disposal Status: None This handler is a hazardous waste transporter.
	www.mapcruzin.com /scruztri/docs/rcris.htm (708 words)

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