214 research outputs found
Signals for Noncommutative QED at Future Colliders
The signatures for noncommutative QED at colliders with center of
mass energies in the range of 0.5-5 TeV are examined. For integrated
luminosities of 0.5-1 ab or more, sensitivities to the associated mass
scales greater than are possible.Comment: LaTex, 6 pages, 6 figs; to appear in the Proceedings of the Fourth
International Workshop on Interactions at TeV Energies, UC Santa
Cruz, 7-9 Dec 200
Noncommutative QED and Anomalous Dipole Moments
We study QED on noncommutative spaces, NCQED. In particular we present the
detailed calculation for the noncommutative electron-photon vertex and show
that the Ward identity is satisfied. We discuss that in the noncommutative case
moving electron will show {\it electric} dipole effects. In addition, we work
out the electric and magnetic dipole moments up to one loop level. For the
magnetic moment we show that noncommutative electron has an intrinsic (spin
independent) magnetic moment.Comment: 27 pages, several .ps and .eps figures, v3:typos in some formula
corrected, version appeared in JHE
Noncommutative Space Corrections on the Klein-Gordon and Dirac Oscillators Spectra
We consider the influence of a noncommutative space on the Klein-Gordon and
the Dirac oscillators. The nonrelativistic limit is taken and the
-modified Hamiltonians are determined. The corrections of these
Hamiltonians on the energy levels are evaluated in first-order perturbation
theory. It is observed a total lifting of the degeneracy to the considered
levels. Such effects are similar to the Zeeman splitting in a commutative
space.Comment: 15 pages, 2 figures, improvements and changes are added, Final
version published in IJMP
Photon deflection by a Coulomb field in noncommutative QED
In noncommutative QED photons present self-interactions in the form of triple
and quartic interactions. The triple interaction implies that, even though the
photon is electrically neutral, it will deflect when in the presence of an
electromagnetic field. If detected, such deflection would be an undoubted
signal of noncommutative space-time. In this work we derive the general
expression for the deflection of a photon by any electromagnetic field. As an
application we consider the case of the deflection of a photon by an external
static Coulomb field.Comment: 07 pages, some typos corrected, accepted for publication in JP
One-loop renormalization of general noncommutative Yang-Mills field model coupled to scalar and spinor fields
We study the theory of noncommutative U(N) Yang-Mills field interacting with
scalar and spinor fields in the fundamental and the adjoint representations. We
include in the action both the terms describing interaction between the gauge
and the matter fields and the terms which describe interaction among the matter
fields only. Some of these interaction terms have not been considered
previously in the context of noncommutative field theory. We find all
counterterms for the theory to be finite in the one-loop approximation. It is
shown that these counterterms allow to absorb all the divergencies by
renormalization of the fields and the coupling constants, so the theory turns
out to be multiplicatively renormalizable. In case of 1PI gauge field functions
the result may easily be generalized on an arbitrary number of the matter
fields. To generalize the results for the other 1PI functions it is necessary
for the matter coupling constants to be adapted in the proper way. In some
simple cases this generalization for a part of these 1PI functions is
considered.Comment: 1+26 pages, figures using axodraw, clarifications adde
Review of the Phenomenology of Noncommutative Geometry
We present a pedagogical review of particle physics models that are based on
the noncommutativity of space-time, , with specific attention to the phenomenology these models predict in
particle experiments either in existence or under development. We summarize
results obtained for high energy scattering such as would occur for example in
a future linear collider with , as well as low
energy experiments such as those pertaining to elementary electric dipole
moments and other \cpviolng observables, and finally comment on the status of
phenomenological work in cosmology and extra dimensions.Comment: updated, references added, corrected typo
Positronium Hyperfine Splitting in Non-commutative Space at the Order
We obtain positronium Hyperfine Splitting owing to the non-commutativity of
space and show that, in the leading order, it is proportional to where, is the parameter of non-commutativity. It is also
shown that spatial non-commutativity splits the spacing between triplet
excited levels which provides an experimental test on
the non-commutativity of space.Comment: 7 pages, 2 figures, to appear in Phys. Rev.
Flat Cosmology with Coupled Matter and Dark Energies
Three models of a flat universe of coupled matter and dark energies with
different low-redshift parameterizations of the dark energy equation of state
are considered. The dark energy is assumed to vary with time like the trace of
the energy-momentum tensor of cosmic matter. In the radiation-dominated era the
models reduce to standard cosmology. In the matter-dominated era they are, for
modern values of the cosmological parameters, consistent with data from SNe Ia
searches and with the data of Gurvits et al.(1999)for angular sizes of ultra
compact radio sources. We find that the angular size-redshift tests for our
models offer a higher statistical confidence than that based on SNe Ia data. A
comparison of our results with a recent revised analysis of angular
size-redshift legacy data is made,and the implications of our models with
optimized relativistic beaming in the radio sources is discussed. In particular
we find that relativistic beaming implies a Lorentz factor less than 6,in
agreement with its values for powerful Active Galactic Nuclei.Comment: Version to appear in The Astronomical Journal, with a modified name-
Flat Cosmology with Coupled Matter and Dark Energies. Expanded and Modified
conten
Compton scattering in Noncommutative Space-Time at the NLC
We study the Compton scattering in the noncommutative counter part of QED (NC
QED). Interactions in NC QED have momentum dependent phase factors and the
gauge fields have Yang Mills type couplings, this modifies the cross sections
and are different from the commuting Standard Model. Collider signals of
noncommutative space-time are studied at the Next Linear Collider (NLC)
operating in the mode. Results for different polarised cases are
presented and it is shown that the Compton process can probe the noncommutative
scale in the range of 1 - 2.5 TeV for typical proposed NLC energies.Comment: 12 pages, 5 Postscript figures, version to appear in Phys. Rev.
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