1 / 39

Non-Abelian Tensor Gauge Fields Generalization of Yang-Mills Theory

Explore the generalization of Yang-Mills theory to non-abelian tensor gauge fields. Discover the structure of tensionless strings, interaction vertices, and unitarity manifested in the Lagrangian formulation. Dive into high-spin extensions of the standard model and the exponential growth of tensor fields. Understand the wave functions of ground and excited states in the context of gauge transformations and relativistic descriptions. Study the historical contributions to particle physics by Majorana, Dirac, Wigner, Fierz, Pauli, Schwinger, Yukawa, and Weinberg, among others.

parksb
Download Presentation

Non-Abelian Tensor Gauge Fields Generalization of Yang-Mills Theory

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Non-Abelian Tensor Gauge Fields Generalization of Yang-Mills Theory Corfu 2005 George Savvidy Demokritos National Research Center Athens Tensionless Strings Non-Abelian Tensor Gauge Fields PhysLett B552 (2003) 72 Hep-th/0505033 Int.J.Mod.Phys. A19 (2004) 3171 Hep-th/0509049 PhysLett B615 (2005) 285 PhysLett B625 (2005)341

  2. Spectrum of Tensionless strings with perimeter action • Extended gauge transformation of the ground state • Non-Abelian extended gauge transformations • Field strength tensors • Invariant Lagrangian and the interaction vertices • Unitarity • High spin extension of the standard model

  3. String Field Theory • The Lagrangian and the field equations for the tensor fields ? • The multiplicity of tensor fields grows exponentially. • How to describe unbroken phase of string theory when

  4. Tensionless String The ground state wave function is a function of two variables: where thus Symmetric, traceless, divergent free tensors of increasing rank s=1,2,3,….

  5. The first excited state wave function is its norm is equal to zero and it is orthogonal to the ground state We could therefore impose an equivalent relation imply the gauge transformation The equivalence relation

  6. The relativistic wave function should depend on two variables Yukawa in 1950 Wigner in 1963 The metric is (- + + +)

  7. The Lagrangian and the fields equations for the tensor gauge fields ? Tensor Gauge Fields and Their Interactions What is know?

  8. The Lagrangian and S-matrix Formulation of Free Tensor Fields 1. E.Majorana. Teoria Relativistica di Particelle con Momento Intrinseco Arbitrario. Nuovo Cimento 9 (1932) 335 2. P.A.M.Dirac. Relativistic wave equations. Proc. Roy. Soc. A155 (1936) 447; Unitary Representation of the Lorentz Group. Proc. Roy. Soc. A183 (1944) 284. 3. M. Fierz. Helv. Phys. Acta. 12 (1939) 3. M. Fierz and W. Pauli. On Relativistic Wave Equations for Particles of Arbitrary Spin in an Electromagnetic Field. Proc. Roy. Soc. A173 (1939) 211. 4. E. Wigner. On Unitary Representations of the Inhomogeneous Lorentz Group. Ann.Math. 40 (1939) 149. 5. W. Rarita and J. Schwinger. On a Theory of Particles with Half-Integral Spin. Phys. Rev. 60 (1941) 61 6. H.Yukawa. "Quantum Theory of Non-Local Fields. Part I. Free Fields" Phys. Rev. 77 (1950) 219; M. Fierz. "Non-Local Fields" Phys. Rev. 78 (1950) 184 7. J.Schwinger. Particles, Sourses, and Fields (Addison-Wesley, Reading, MA, 1970) 8. S. Weinberg, “Feynman Rules For Any Spin," Phys. Rev. 133 (1964) B1318. Feynman Rules For Any Spin. 2: Massless Particles," Phys. Rev. 134 (1964) B882. Photons And Gravitons In S Matrix Theory: Derivation Of Charge Conservation And Equality Of Gravitational And Inertial Mass," Phys. Rev. 135 (1964) B1049. 9. S. J. Chang. Lagrange Formulation for Systems with Higher Spin. Phys.Rev. 161 (1967) 1308 25

  9. L. P. S. Singh and C. R. Hagen. Lagrangian formulation for arbitrary spin. I. • The boson case. Phys. Rev. D9 (1974) 898 • L. P. S. Singh and C. R. Hagen. Lagrangian formulation for arbitrary spin. II. • The fermion case. Phys. Rev. D9 (1974) 898, 910 • 3. C.Fronsdal. Massless fields with integer spin, Phys.Rev. D18 (1978) 3624 • 4. J.Fang and C.Fronsdal. Massless fields with half-integral spin, • Phys. Rev. D18 (1978) 3630

  10. Free field Lagrangian: Equations: helicity Gauge Transformation:

  11. The question of introducing Interaction appears to be much complex • 1. N.S.Gupta. "Gravitation and Electromagnetism". Phys. Rev. 96, (1954) 1683 . • 2. R.H.Kraichnan.Special-relativistic derivation of generally covariant gravitation theory. • Phys. Rev. 98, (1955) 1118. • 3. W.E.Thirring. "An alternative approach to the theory of gravitation". • Ann. Phys.16, (1961) 96. • 4. R.P.Feynman. "Feynman Lecture on Gravitation". Westview Press 2002. • 5. S.Deser. "Self-interaction and gauge invariance". Gen. Rel. Grav. 1, (1970) 9. • 6. J.Fang and C.Fronsdal. "Deformation of gauge groups. Gravitation". • J. Math. Phys.20 (1979) 2264 • 7 S.Weinberg and E.Witten.Limits on massless particles. Phys. Lett. B 96 (1980) 59. • 8.C. Aragone and S. Deser. Constraints on gravitationally coupled tensor fields. • Nuovo. Cimento. 3A (1971) 709; • 9.C.Aragone and S.Deser. Consistancy problems of hypergavity, • Phys. Lett. B 86 (1979) 161. • 10.B.deWit, F.A. Berends, J.W.van Halten and P.Nieuwenhuizen.On Spin-5/2 gauge • fields, J. Phys. A: Math. Gen. 16 (1983) 543. • 11. M.A.Vasiliev. Progress in Higher Spin Gauge Theories, hep-th/0104246; • M.A.Vasiliev et. al. Nonlinear Higher Spin Theories in Various Domensions, • hep-th/0503128

  12. 1. F. A. Berends, G. J. H Burgers and H. Van Dam, On the Theoretical problems in Constructing Interactions Involving Higher-Spin Massless Particles, Nucl. Phys. B260 (1985) 295. 2. A. K. Bengtsson, I. Bengtsson and L. Brink. Cubic Interaction Terms For Arbitrary Spin Nucl. Phys. B 227 (1983) 31. 3. A. K. Bengtsson, I. Bengtsson and L. Brink. Cubic Interaction Terms For Arbitrarily Extended Supermultiplets, Nucl. Phys. B 227 (1983) 41. The first positive result of Lars Brink and collaborators. In the light-front approach the cubic interaction term has the form: • Where the two components of the complex field describe the helicities • Important to generalize to higher orders • There are lambda derivatives in the interaction • Coupling constant

  13. The Abelian Gauge Transformations closed algebraic structure

  14. In our approach the gauge fields are defined as rank-(s+1) tensors

  15. The extended non-Abelian gauge transformation of the tensor gauge fields we shell defined by the following equations The infinitesimal gauge parameters are totally symmetric rank-s tensors

  16. In general the formula is: The summation is over all permutation of two sets of indices

  17. Extended gauge transformations form a closed algebraic structure In matrix form the transformation is : The commutator of two gauge transformations acting on a rank-2 tensor gauge field is:

  18. Gauge Algebra where In general case we shall get and is again an extended gauge transformation with gauge parameters

  19. The field strength tensors we shall define as: The inhomogeneous extended gauge transformation induces the homogeneous gauge transformation of the corresponding field strength tensors

  20. Yang-Mills Fields First rank gauge fields It is invariant with respect to the non-Abelian gauge transformation The homogeneous transformation of the field strength is

  21. where

  22. The invariance of the Lagrangian Its variation is

  23. The first three terms of the Lagrangian are:

  24. The Lagrangian for the rank-s gauge fields is (s=0,1,2,…) where the field strength tensors transform by the law and the coefficient is

  25. The total Lagrangian is a sum of invariant terms: • It is important that: • the Lagrangian does not contain higher derivatives of tensor gauge fields • all interactions take place through the three- and four-particle exchanges • with dimensionless coupling constant • the complete Lagrangian contains all higher rank tensor gauge fields • and should not be truncated. • The extended gauge theory has the same degree of divergence of its • Feynman diagrams as the Yang-Mills theory does and most probably • will be renormalizable.

  26. Unitarity ? When the gauge coupling constant g is equal to zero, g=0 then the extended gauge transformations will reduce to the form …………………………

  27. The Lagrangian was not the most general Lagrangian which can be constructed in terms of the field strength tensors. There exists a second invariant Lagrangian The variation of the Lagrangian is:

  28. As a result we have two invariant Lagrangians and the general Lagrangian is a linear combination of these two Lagrangians If c=1 then we shall have enhanced local gauge invariance of the Lagrangian with double number of gauge parameters

  29. The Free Field Equations For symmetric tensor fields the equation reduces to the FPSCSHF equation for antisymmetric tensor fields it reduces to the equation

  30. The variation over the vector gauge fields of the Lagrangian the variation over the tensor gauge fields gives

  31. Representing equations in the form we shall get where

  32. Interaction Vertices The VVV vertex The VTT vertex

  33. Vector Gauge Bosons and Their High Spin Descendence Beyond the SM 3/2 spin 2 1/2 1 spin Standard Model Decay reactions

  34. Creation channel tensor lepnos s=3/2 standard leptons s=1/2 vector gauge boson tensor boson s=2

More Related