Methods of Quantization: Lectures Held at the 39. Universitätswochen für Kern- und Teilchenphysik, Schladming, Austria

ISBN-13: 9783662143360 / Angielski / Miękka / 2013 / 228 str.

Heimo Latal;Wolfgang Schweiger

Opis

Thisvolumecontainsthewrittenversionsofinvitedlecturespresentedat the 39. InternationaleUniversit]atswochenfur ] Kern-undTeilchenphysik in Schladming, Austria, which took place from February 26th to March 4th, 2000. The title of the school was Methods of Quantization . This is, of course, averybroad?eld, soonlysomeofthenewandinterestingdevel- mentscouldbecoveredwithinthescopeoftheschool. About75yearsagoSchr]odingerpresentedhisfamouswaveequationand Heisenbergcameupwithhisalgebraicapproachtothequantum-theoretical treatmentofatoms. Aimingmainlyatanappropriatedescriptionofatomic systems, these original developments did not take into consideration E- stein stheoryofspecialrelativity. WiththeworkofDirac, Heisenberg, and Pauliitsoonbecameobviousthatauni?edtreatmentofrelativisticandqu- tume?ectsisachievedbymeansoflocalquantum?eldtheory, i. e. anintrinsic many-particletheory. Mostofourpresentunderstandingoftheelementary buildingblocksofmatterandtheforcesbetweenthemisbasedonthequ- tizedversionof?eldtheorieswhicharelocallysymmetricundergaugetra- formations. Nowadays, theprevailingtoolsforquantum-?eldtheoreticalc- culationsarecovariantperturbationtheoryandfunctional-integralmethods. Beingnotmanifestlycovariant, theHamiltonianapproachtoquantum-?eld theorieslagssomewhatbehind, althoughitresemblesverymuchthefamiliar nonrelativisticquantummechanicsofpointparticles. Aparticularlyintere- ingHamiltonianformulationofquantum-?eldtheoriesisobtainedbyqu- tizingthe?eldsonhypersurfacesoftheMinkowsispacewhicharetangential tothelightcone. The timeevolution ofthesystemisthenconsideredin + light-conetime x =t+z/c. Theappealingfeaturesof light-conequ- tization, whicharethereasonsfortherenewedinterestinthisformulation ofquantum?eldtheories, werehighlightedinthelecturesofBernardBakker andThomasHeinzl. Oneoftheopenproblemsoflight-conequantizationis theissueofspontaneoussymmetrybreaking. Thiscanbetracedbacktozero modeswhich, ingeneral, aresubjecttocomplicatedconstraintequations. A generalformalismforthequantizationofphysicalsystemswithconstraints waspresentedbyJohnKlauder. Theperturbativede?nitionofquantum?eld theoriesisingenerala?ictedbysingularitieswhichareovercomebyare- larizationandrenormalizationprocedure. Structuralaspectsoftherenormal- VI Preface izationprobleminthecaseofgaugeinvariant?eldtheorieswerediscussed inthelectureofKlausSibold. Areviewofthemathematicsunderlyingthe functional-integralquantizationwasgivenbyLudwigStreit. Apartfromthetopicsincludedinthisvolumetherewerealsolectures ontheKaluza Kleinprogramforsupergravity(P. vanNieuwenhuizen), on dynamicalr-matricesandquantization(A. Alekseev), andonthequantum Liouvillemodelasaninstructiveexampleofquantumintegrablemodels(L. Faddeev). Inaddition, theschoolwascomplementedbymanyexcellents- inars. Thelistofseminarspeakersandthetopicsaddressedbythemcanbe foundattheendofthisvolume. Theinterestedreaderisrequestedtocontact thespeakersdirectlyfordetailedinformationorpertinentmaterial. Finally, wewouldliketoexpressourgratitudetothelecturersforalltheir e?ortsandtothemainsponsorsoftheschool, theAustrianMinistryofE- cation, Science, andCultureandtheGovernmentofStyria, forprovidingg- eroussupport. Wealsoappreciatethevaluableorganizationalandtechnical assistanceofthetownofSchladming, theSteyr-Daimler-PuchFahrzeugte- nik, Ricoh Austria, Styria Online, and the Hornig company. Furthermore, wethankoursecretaries, S. FuchsandE. Monschein, anumberofgra- atestudentsfromourinstitute, and, lastbutnotleast, ourcolleaguesfrom theorganizingcommitteefortheirassistanceinpreparingandrunningthe school. Graz, HeimoLatal March2001 WolfgangSchweiger Contents FormsofRelativisticDynamics BernardL. G. Bakker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 ThePoincareGroup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 FormsofRelativisticDynamics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. 1 ComparisonofInstantForm, FrontForm, andPointForm. . . 6 4 Light-FrontDynamics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4. 1 RelativeMomentum, InvariantMass. . . . . . . . . . . . . . . . . . . . . . 9 4. 2 TheBoxDiagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 PoincareGeneratorsinFieldTheory. . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5. 1 FermionsInteractingwithaScalarField. . . . . . . . . . . . . . . . . . . 20 5. 2 InstantForm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 5. 3 FrontForm(LF). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 5. 4 InteractingandNon-interactingGeneratorsonanInstant andontheLightFront. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6 Light-FrontPerturbationTheory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 6. 1 ConnectionofCovariantAmplitudes toLight-FrontAmplitudes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 6. 2 Regularization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 6. 3 MinusRegularization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 7 TriangleDiagraminYukawaTheory. . . . . . . . . . . . . . . . . . . . . . . . . . . 27 7. 1 CovariantCalculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 7. 2 ConstructionoftheCurrentinLFD. . . . . . . . . . . . . . . . . . . . . . . 30 7. 3 NumericalResults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3 8 FourVariationsonaThemein? Theory. . . . . . . . . . . . . . . . . . . . . . 37 8. 1 CovariantCalculation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 8. 2 Instant-FormCalculation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 8. 3

Spis treści

Forms of Relativistic Dynamics.- Light-Cone Quantization: Foundations and Applications.- Quantization of Constrained Systems.- Algebraic Methods of Renormalization.- Functional Integrals for Quantum Theory.

O autorze

Wolfgang Schweiger wurde 1951 in Traunstein geboren. Seit 1979 ist er als Autor und Journalist tätig. Er veröffentlichte Krimis und schrieb Drehbücher für TV-Serien.

Blurb

Most of our present understanding of the elementary building blocks of matter and the forces between them is based on the quantized version of the field theories which are locally symmetric under gauge transformations. The present set of lecture notes gives both a status report and a survey of recent advances for the most important quantization methods in the field theories for elementary particle physics. The first part of the book introduces light-cone quantization as an interesting alternative to the commonly used covariant perturbation theory and functional-integral methods. Next, a general formalism for quantizing systems with constraints, the projection-operator approach, is presented and structural aspects of the renormalization problem for gauge invariant field theories are discussed. Finally, the mathematics underlying the functional-integral quantization is reviewed. Suitable as a reference for researchers in the field, the book will prove particularly useful for lecturers and graduate students in search of additional reading beyond the standard texts on quantum field theory.