324 research outputs found
Supergravity Tensor Calculus in 5D from 6D
Supergravity tensor calculus in five spacetime dimensions is derived by
dimensional reduction from the d=6 superconformal tensor calculus. In
particular, we obtain an off-shell hypermultiplet in 5D from the on-shell
hypermultiplet in 6D. Our tensor calculus still retains the dilatation gauge
symmetry so that it becomes a trivial gauge fixing to make the Einstein term
canonical in a general matter-Yang-Mills-supergravity coupled system.Comment: 38 pages, no figures, LaTeX, version to appear in PTP
104(2000),835-86
Off-shell d=5 Supergravity coupled to Matter-Yang-Mills System
We present an off-shell formulation of matter-Yang-Mills system coupled to
supergravity in five dimensional space-time. We give an invariant action for
the general system of vector multiplets and hypermultiplets coupled to
supergravity as well as the supersymmetry transformation rules. All the
auxiliary fields are kept un-eliminated so that the supersymmetry
transformation rules remain unchanged even when the action is changed.Comment: 36 pages, no figures, LaTeX, version to appear in PTP
105(2001),323-35
Mass Matrices in E6 Unification
We study a supersymmetric E6 grand unified model in which the SU(5) 5^*
components are twisted in the third generation 27. Supplementing the adjoint
Higgs field to a model analyzed previously, we calculate the mass matrices for
the up and down quarks and charged leptons. Although the number of free
parameters is less than that of observables, an overall fitting to the observed
masses and mixing angles is shown to be possible. Most notably, we find two
novel, parameter-independent relations between the lepton 2-3 mixing angle and
the quark masses and CKM mixing angles that are in good agreement with the
large lepton mixing recently observed.Comment: 33 pages, 5 figures, typos correcte
Gravitational Supersymmetry Breaking
We consider supersymmetry breaking models with a purely constant
superpotential in supergravity. The supersymmetry breaking is induced for the
vanishing cosmological constant. As a hidden mediation sector of supersymmetry
breaking, it naturally leads to a split spectrum in supersymmetric standard
model. We also point out possible utility of our setup to construct nonlinear
sigma model and/or Fayet-Iliopoulos-like term in broken supergravity.Comment: 6 page
Superfield description of 5D supergravity on general warped geometry
We provide a systematic and practical method of deriving 5D supergravity
action described by 4D superfields on a general warped geometry, including a
non-BPS background. Our method is based on the superconformal formulation of 5D
supergravity, but is easy to handle thanks to the superfield formalism. We
identify the radion superfield in the language of 5D superconformal gravity,
and clarify its appearance in the action. We also discuss SUSY breaking effects
induced by a deformed geometry due to the backreaction of the radius
stabilizer.Comment: 25 pages, no figures, LaTeX, final version to appear in JHE
Nearby CFT's in the operator formalism: The role of a connection
There are two methods to study families of conformal theories in the operator
formalism. In the first method we begin with a theory and a family of deformed
theories is defined in the state space of the original theory. In the other
there is a distinct state space for each theory in the family, with the
collection of spaces forming a vector bundle. This paper establishes the
equivalence of a deformed theory with that in a nearby state space in the
bundle via a connection that defines maps between nearby state spaces. We find
that an appropriate connection for establishing equivalence is one that arose
in a recent paper by Kugo and Zwiebach. We discuss the affine geometry induced
on the space of backgrounds by this connection. This geometry is the same as
the one obtained from the Zamolodchikov metric.Comment: 24 pp, CTP#215
Infrared properties of propagators in Landau-gauge pure Yang-Mills theory at finite temperature
The finite-temperature behavior of gluon and of Faddeev-Popov-ghost
propagators is investigated for pure SU(2) Yang-Mills theory in Landau gauge.
We present nonperturbative results, obtained using lattice simulations and
Dyson-Schwinger equations. Possible limitations of these two approaches, such
as finite-volume effects and truncation artifacts, are extensively discussed.
Both methods suggest a very different temperature dependence for the magnetic
sector when compared to the electric one. In particular, a clear thermodynamic
transition seems to affect only the electric sector. These results imply in
particular the confinement of transverse gluons at all temperatures and they
can be understood inside the framework of the so-called Gribov-Zwanziger
scenario of confinement.Comment: 25 pages, 14 figures, 2 tables, minor changes of typographical and
design character, some minor errors corrected, version to appear in PR
Perturbative quantum gauge invariance: Where the ghosts come from
A condensed introduction to quantum gauge theories is given in the
perturbative S-matrix framework; path integral methods are used nowhere. This
approach emphasizes the fact that it is not necessary to start from classical
gauge theories which are then subject to quantization, but it is also possible
to recover the classical group structure and coupling properties from purely
quantum mechanical principles. As a main tool we use a free field version of
the Becchi-Rouet-Stora-Tyutin gauge transformation, which contains no
interaction terms related to a coupling constant. This free gauge
transformation can be formulated in an analogous way for quantum
electrodynamics, Yang-Mills theories with massless or massive gauge bosons and
quantum gravity.Comment: 28 pages, LATEX. Some typos corrected, version to be publishe
A Bilocal Field Theory in Four Dimensions
A bilocal field theory having M\"{o}bius gauge invariance is proposed. In
four dimensions there exists a zero momentum state of the first quantized
model, which belongs to a non-trivial BRS cohomology class. A field theory
lagrangian having a gauge invariance only in four dimensions is constructed.Comment: 13 pages, TEP-9R, LaTe
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