4,315 research outputs found
Realistic Gluino Axion Model Consistent with Supersymmetry Breaking at the TeV Scale
The recently proposed model of using the dynamical phase of the gluino to
solve the strong CP problem is shown to admit a specific realization in terms
of fundamental singlet superfields, such that the breaking of supersymmetry
occurs only at the TeV scale, despite the large axion scale of 10^{9} to
10^{12} GeV. Phenomenological implications are discussed.Comment: 12 pp, 2 fig
Increased expression of matrix metalloproteinase-9 in patients with temporal lobe epilepsy
Aim: The molecular mechanism of epileptogenesis in temporal lobe epilepsy is still unclear. Experimental studies have suggested that matrix metalloproteinases have important roles in this process, but human studies are limited. The aim of this study was to assess the expression of MMP-9, MMP-2 and their tissue inhibitors (TIMP-1 and TIMP-2) in patients with temporal lobe epilepsy with hippocampal sclerosis (TLE-HS). Material and Methods: The tissue samples from temporal neocortex and hippocampus were obtained from patients with temporal lobe epilepsy with hippocampal sclerosis who had undergone anterior temporal lobectomy for recurrent medically resistant seizures. Immunohistochemical methods were used to determine the expression of MMP-9, MMP-2 and their tissue inhibitors. Tissue samples were also analyzed with transmission electron microscopy. Results: The immunoreactivity for MMP-9 both in hippocampal and temporal neocortical neurons was stronger than that of MMP-2. Additionally, there was a mild reaction for its tissue inhibitor TIMP-1 as with TIMP-2. The TEM analysis of the hippocampus revealed that there was apparent ultra-structural damage on the pericarya and neuropil of some neurons. There was obvious damage in the mitochondria and the nuclear membrane. Conclusion: The preliminary results of this study revealed that MMP-9 may have a role in patients with drug resistant TLE-HS
Neutrino Masses and the Gluino Axion Model
We extend the recently proposed gluino axion model to include neutrino
masses. We discuss how the canonical seesaw model and the Higgs triplet model
may be realized in this framework. In the former case, the heavy singlet
neutrinos are contained in superfields which do not have any vacuum expectation
value, whereas the gluino axion is contained in one which does. We also
construct a specific renormalizable model which realizes the mass scale
relationship , where is the axion decay constant
and is a large effective mass parameter.Comment: 8 pages, no figur
The CP properties of the lightest Higgs boson with sbottom effects
In the framework of the recently proposed gluino-axion model, using the
effective potential method and taking into account the top-stop as well as the
bottom-sbottom effects, we discuss the CP--properties of the lightest Higgs
boson, in particular its CP--odd composition, which can offer new opportunities
at collider searches. It is found that although the CP-odd composition of the
lightest Higgs increases slightly with the inclusion of the sbottom effects, it
never exceeds %0.17 for all values of the renormalization scale Q ranging from
top mass to TeV scaleComment: 24 pp, 12 eps fig
Postojanost na trošenje i koroziju novih frikcijski postojanih materijala za automobilsku industriju
In this study, after a NiCr bond layer was deposited on a pearlitic, grey cast iron rotor disc of the kind used in a production passenger car (Toyota Corolla 1600 cc), Cr3C2-NiCr and Al2O3-TiO2powders were sprayed using High Velocity Oxygen Fuel(HVOF) and plasma spray processes, respectively. The discs were subjected to cosmetic corrosion test according to SAE J2334 test standard. Additionally, wear tests were carried out using a reciprocating wear tester by rubbing a 10 mm diameter Al2O3 ball on the specimens machined from rotor discs in salt solution. It was found that the Cr3C2-NiCr coating (HSCN) sprayed using HVOF method exhibited highest hardness and highest corrosion and wear resistances.Nakon nanošenja NiCr sloja na disk od sivog lijeva tipa koji se koristi u proizvodnji putničkog automobila (Toyota Corolla 1600 CC), Cr3C2-NiCr i Al2O3-TiO2 prašak je nanešen naštrcavanjem HVOF i plazma postupkom. Disk je izložen korozijskom ispitivanju sukladno standardu SAE J2334. Dodatno je provedeno ispitivanje na trošenje na testeru za uzajamno trošenje 10 mm zrna Al2O3 na uzorcima izrađenim iz rotacijskog diska u slanoj komori. Utvrđeno je da je Cr3C2-NiCr sloj (HSCN) naštrca HVOF postupkom pokazao veću tvrdoću i veću korozijsku postojanost i otpornost na koroziju
Non-Gravitating Scalar Field in the FRW Background
We study interacting scalar field theory non-minimally coupled to gravity in
the FRW background. We show that for a specific choice of interaction terms,
the energy-momentum tensor of the scalar field vanishes, and as a result the
scalar field does not gravitate. The naive space dependent solution to
equations of motion gives rise to singular field profile. We carefully analyze
the energy-momentum tensor for such a solution and show that the singularity of
the solution gives a subtle contribution to the energy-momentum tensor. The
space dependent solution therefore is not non-gravitating. Our conclusion is
applicable to other space-time dependent non-gravitating solutions as well. We
study hybrid inflation scenario in this model when purely time dependent
non-gravitating field is coupled to another scalar field.Comment: 7 Pages, 2 figures, RevTeX4, v2:added a section on regularized
energy-momentum tensor, references and conclusions modifie
Relaxation of the Dynamical Gluino Phase and Unambiguous Electric Dipole Moments
We propose a new axionic solution of the strong CP problem with a
Peccei-Quinn mechanism using the gluino rather than quarks. The spontaneous
breaking of this new global U(1) at 10^{11} GeV also generates the
supersymmetry breaking scale of 1 TeV (solving the so-called \mu problem at the
same time) and results in the MSSM (Minimal Supersymmetric Standard Model) with
R parity conservation. In this framework, electric dipole moments become
calculable without ambiguity.Comment: Typos corrected and a footnote added, 10 p
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