762 research outputs found
Drell-Yan Production of Z' in the Three-Site Higgsless Model at the LHC
In the Higgsless models, there are extra gauge bosons which keep the
perturbative unitarity of a longitudinally polarized gauge boson. The
three-site Higgsless model is a minimal Higgsless model and contains three
extra gauge bosons, and Z'. In this paper, we report the
discovery potential of the Z' gauge boson via Drell-Yan production with
Z'(mass=380, 500, 600 GeV) (,
) at the LHC (=14 TeV).Comment: 7 pages, 5 figures included. References revise
N=1 Supersymmetric Moose Theories
We study the quantum moduli spaces and dynamical superpotentials of four
dimensional linear and ring moose theories with
supersymmetry and link chiral superfields in the fundamental representation.
Nontrivial quantum moduli spaces and dynamical superpotentials are produced.
When the moduli space is perturbed by generic tree level superpotentials, the
vacuum space becomes discrete. The ring moose is in the Coulomb phase and we
find two singular submanifolds with a nontrivial modulus that is a function of
all the independent gauge invariants needed to parameterize the quantum moduli
space. The massive theory near these singularities confines. The Seiberg-Witten
elliptic curve that describes the quantum moduli space of the ring moose is
produced.Comment: 26 pages, 4 figures. A few comments and references added. To appear
in PR
Dynamic Linear Programming Model for Agricultural Investment and Resources Utilization Policies
In this paper a dynamic linear programming model for large scale farm development is presented. Special emphasis is placed upon the modelling of investment policies and associated resource utilization programs. Firstly, a flexible modelling procedure to handle capital input constraints of farms is outlined. In the second half of the study a dynamic linear programming model covering the whole farming system and the whole planning horizon is described. The paper concludes by summarizing the experiences gained in Hungary in the use of different linear and dynamic linear programming models of agricultural development
How Well Does AdS/QCD Describe QCD?
AdS/QCD is an extra-dimensional approach to modeling hadronic physics,
motivated by the AdS/CFT correspondence in string theory. AdS/QCD models are
often more accurate than would have been expected at energies below a few GeV.
We address the question of why these models are so successful, and respond to
some of the criticisms that have been waged against these models.Comment: To appear in proceedings of Crossing the Boundaries: Gauge Dynamics
at Strong Coupling (Shifmania), Minnesota, May 14-17, 2009. 12 pages, 2 eps
figure
Inhomogeneous Equation of State of the Universe: Phantom Era, Future Singularity and Crossing the Phantom Barrier
The dark energy universe equation of state (EOS) with inhomogeneous,Hubble
parameter dependent term is considered. The motivation to introduce such a term
comes from time-dependent viscosity considerations and modifications of general
relativity. For several explicit examples of such EOS it is demonstrated how
the type of future singularity changes, how the phantom epoch emerges and how
crossing of phantom barrier occurs. Similar cosmological regimes are considered
for the universe with two interacting fluids and for universe with implicit
EOS. For instance, the crossing of phantom barrier is realized in easier way,
thanks to the presence of inhomogeneous term. The thermodynamical dark energy
model is presented where the universe entropy may be positive even at phantom
era as a result of crossing of w=-1 barrier.Comment: LaTeX, 13 pages, refs. added, version to appear in PR
Detecting Axion-Like Particles With Gamma Ray Telescopes
We propose that axion-like particles (ALPs) with a two-photon vertex,
consistent with all astrophysical and laboratory bounds, may lead to a
detectable signature in the spectra of high-energy gamma ray sources. This
occurs as a result of gamma rays being converted into ALPs in the magnetic
fields of efficient astrophysical accelerators according to the "Hillas
criterion", such as jets of active galactic nuclei or hot spots of radio
galaxies. The discovery of such an effect is possible by GLAST in the 1-100 GeV
range and by ground based gamma ray telescopes in the TeV range.Comment: corrected typos, one plot modified, material rearranged for
clarification. Conclusions unchanged. Matches version published in Phys. Rev.
Let
QCD Glueball Masses from AdS-6 Black Hole Description
By using the generalized version of gauge/gravity correspondence, we study
the mass spectra of several typical QCD glueballs in the framework of
AdS black hole metric of Einstein gravity theory. The obtained glueball
mass spectra are numerically in agreement with those from the AdS
black hole metric of the 11-dimensional supergravity.Comment: 10 pages, references updated and minor change
On Gauge Dynamics and SUSY Breaking in Orientiworld
In the Orientiworld framework the Standard Model fields are localized on
D3-branes sitting on top of an orientifold 3-plane. The transverse
6-dimensional space is a non-compact orbifold (or a more general conifold). The
4-dimensional gravity on D3-branes is reproduced due to the 4-dimensional
Einstein-Hilbert term induced at the quantum level. The orientifold 3-plane
plays a crucial role, in particular, without it the D3-brane world-volume
theories would be conformal due to the tadpole cancellation. We study
non-perturbative gauge dynamics in various N=1 supersymmetric orientiworld
models based on the Z_3 as well as Z_5 and Z_7 orbifold groups. Our discussions
illustrate that there is a rich variety of supersymmetry preserving dynamics in
some of these models. On the other hand, we also find some models with
dynamical supersymmetry breaking.Comment: 21 pages, revtex, minor misprints corrected (to appear in Int. J.
Mod. Phys. A
Inflating Intersecting Branes and Remarks on the Hierarchy Problem
We generalize solutions of Einstein's equations for intersecting branes in
higher dimensional spacetimes to the nonstatic case, modeling an expanding
universe. The relation between the Hubble rate, the brane tensions, and the
bulk cosmological constant is similar to the case of a single 3-brane in a
5-dimensional spacetime. However, because the bulk inflates as well as the
branes, this class of solutions suffers from Newton's constant tending toward
zero on the TeV brane, where the Randall-Sundrum mechanism should solve the
weak scale hierarchy problem. The strength of gravity remains constant on the
Planck brane, however.Comment: 10 pages, LaTeX. v2:Misprint in eq. (23) corrected; citations fixed
and clarified relationship of our work to hep-th/9909053 and hep-th/9909076
v3: final version to appear in PLB. Corrected discussion of the time
dependance of the 4-D Planck mass on the TeV brane. Some references added to
earlier works on warped Kaluza-Klein compactification
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