Higgsless model
From Wikipedia, the free encyclopedia
In particle physics, a Higgsless model is a model that does not involve the Higgs boson or in which the Higgs field is not dynamic.[clarification needed] Such models must employ a different mechanism of mass generation, electroweak symmetry breaking and unitarity.
In the years since the Higgs mechanism was first described, there have been several alternatives proposed. All of the alternative mechanisms use strongly interacting dynamics to produce a vacuum expectation value that breaks electroweak symmetry. A partial list of these alternative mechanisms includes:
- Technicolor models break electroweak symmetry through new gauge interactions, which were originally modeled on quantum chromodynamics.[1][2]
- Extra-dimensional Higgsless models use the fifth component of the gauge fields to play the role of the Higgs fields. It is possible to produce electroweak symmetry breaking by imposing certain boundary conditions on the extra dimensional fields, increasing the unitarity breakdown scale up to the energy scale of the extra dimension.[3][4] Through the AdS/QCD correspondence this model can be related to technicolor models and to "UnHiggs" models in which the Higgs field is of unparticle nature.[5]
- Models of composite W and Z vector bosons.[6]
- Top quark condensate.
- "Unitary Weyl gauge". If one adds a suitable gravitational term to the standard model action with gravitational coupling, the theory becomes locally scale invariant (i.e. Weyl invariant) in the unitary gauge for the local SU(2). Weyl transformations act multiplicatively on the Higgs field, so one can fix the Weyl gauge by requiring the Higgs scalar to be a constant.[7]
- Asymptotically safe weak interactions [8][9] based on some nonlinear sigma models.[10]
- Preon and models inspired by preons such as Ribbon model of Standard Model particles by Sundance Bilson-Thompson, based in braid theory and compatible with loop quantum gravity and similar theories.[11] This model not only explains mass but leads to an interpretation of electric charge as a topological quantity (twists carried on the individual ribbons) and colour charge as modes of twisting.
- Symmetry breaking driven by non-equilibrium dynamics of quantum fields above the electroweak scale.[12][13]
- Unparticle physics and the unhiggs.[14][15] These are models that posit that the Higgs sector and Higgs boson are scaling invariant, also known as unparticle physics.
- In theory of superfluid vacuum masses of elementary particles can arise as a result of interaction with the physical vacuum, similarly to the gap generation mechanism in superconductors.[16][17]
- UV-Completion by Classicalization, in which the unitarization of the WW scattering happens by creation of classical configurations.[18]
[edit] References
- ^ Steven Weinberg (1976), "Implications of dynamical symmetry breaking", Physical Review D13 (4): 974–996, Bibcode 1976PhRvD..13..974W, doi:10.1103/PhysRevD.13.974.
S. Weinberg (1979), "Implications of dynamical symmetry breaking: An addendum", Physical Review D19 (4): 1277–1280, Bibcode 1979PhRvD..19.1277W, doi:10.1103/PhysRevD.19.1277. - ^ Leonard Susskind (1979), "Dynamics of spontaneous symmetry breaking in the Weinberg-Salam theory", Physical Review D20 (10): 2619–2625, Bibcode 1979PhRvD..20.2619S, doi:10.1103/PhysRevD.20.2619.
- ^ Csaki, C.; Grojean, C.; Pilo, L.; Terning, J. (2004), "Towards a realistic model of Higgsless electroweak symmetry breaking", Physical Review Letters 92 (10): 101802, arXiv:hep-ph/0308038, Bibcode 2004PhRvL..92j1802C, doi:10.1103/PhysRevLett.92.101802, PMID 15089195
- ^ Csaki, C.; Grojean, C.; Pilo, L.; Terning, J.; Terning, John (2004), "Gauge theories on an interval: Unitarity without a Higgs", Physical Review D 69 (5): 055006, arXiv:hep-ph/0305237, Bibcode 2004PhRvD..69e5006C, doi:10.1103/PhysRevD.69.055006
- ^ Calmet, X.; Deshpande, N. G.; He, X. G.; Hsu, S. D. H. (2008), "Invisible Higgs boson, continuous mass fields and unHiggs mechanism", Physical Review D 79 (5): 055021, arXiv:0810.2155, Bibcode 2009PhRvD..79e5021C, doi:10.1103/PhysRevD.79.055021
- ^ Abbott, L. F.; Farhi, E. (1981), "Are the Weak Interactions Strong?", Physics Letters B 101 (1–2): 69, Bibcode 1981PhLB..101...69A, doi:10.1016/0370-2693(81)90492-5
- ^ Pawlowski, M.; Raczka, R. (1994), "A Unified Conformal Model for Fundamental Interactions without Dynamical Higgs Field", Foundations of Physics 24 (9): 1305–1327, arXiv:hep-th/9407137, Bibcode 1994FoPh...24.1305P, doi:10.1007/BF02148570
- ^ Calmet, X. (2011), "Asymptotically safe weak interactions", Mod. Phys. Lett. A26: 1571–1576, arXiv:1012.5529, Bibcode 2011MPLA...26.1571C, doi:10.1142/S0217732311035900
- ^ Calmet, X. (2011), "An Alternative view on the electroweak interactions", Int.J.Mod.Phys. A26: 2855–2864, arXiv:1008.3780, Bibcode 2011IJMPA..26.2855C, doi:10.1142/S0217751X11053699
- ^ Codello, A.; Percacci, R. (2008), "Fixed Points of Nonlinear Sigma Models in d>2", Physics Letters B 672 (3): 280–283, arXiv:0810.0715, Bibcode 2009PhLB..672..280C, doi:10.1016/j.physletb.2009.01.032
- ^ Bilson-Thompson, Sundance O.; Markopoulou, Fotini; Smolin, Lee (2007), "Quantum gravity and the standard model", Class. Quantum Grav. 24 (16): 3975–3993, arXiv:hep-th/0603022, Bibcode 2007CQGra..24.3975B, doi:10.1088/0264-9381/24/16/002.
- ^ http://dx.doi.org/10.1209/0295-5075/82/11001
- ^ http://www.ejtp.com/articles/ejtpv7i24p219.pdf
- ^ http://arxiv.org/PS_cache/arxiv/pdf/0807/0807.3961v2.pdf
- ^ http://arxiv.org/PS_cache/arxiv/pdf/0901/0901.3777v2.pdf
- ^ K. G. Zloshchastiev, Spontaneous symmetry breaking and mass generation as built-in phenomena in logarithmic nonlinear quantum theory, Acta Phys. Polon. B 42 (2011) 261-292 ArXiv:0912.4139.
- ^ A. V. Avdeenkov and K. G. Zloshchastiev, Quantum Bose liquids with logarithmic nonlinearity: Self-sustainability and emergence of spatial extent, J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 195303. ArXiv:1108.0847.
- ^ http://arxiv.org/abs/1010.1415
[edit] External links
 |
This particle physics-related article is a stub. You can help Wikipedia by expanding it. |
