10,429 research outputs found
Interpretation of 750 GeV Diphoton Excess at LHC in Singlet Extension of Color-octet Neutrino Mass Model
We propose that the possible 750 GeV diphoton excess can be explained in the
color-octet neutrino mass model extended with a scalar singlet . The
model generally contains species of color-octet, electroweak doublet
scalars and species of color-octet, electroweak triplet or
singlet fermions. While both scalars and fermions contribute to the
production of through gluon fusion, only the charged members induce the
diphoton decay of . The diphoton rate can be significantly enhanced due
to interference between the scalar and fermion loops. We show that the diphoton
cross section can be from 3 to 10 fb for O(TeV) color-octet particles while
evading all current LHC limits.Comment: 12 pages, 4 figures; v2: 13 pages, 4 figures, version to appear in
EPJC, clarified a few things, updated numerical analysis using the most
recent bound on color-octet fermions but without changing conclusions,
corrected a mistake when quoting the branching ratio to Z gamma, added some
references missed in v
Role of Spironolactone Chalcone in the Prevention of Peritoneal Fibrosis in Patients with Peritoneal Dialysis
Purpose: The study was designed to investigate the effects of a novel spironolactone chalcone in theĀ prevention of peritoneal fibrosis.Methods: Wistar rats (n = 30) were randomly assigned to 3 groups: bacteria (B), spironolactone amideĀ treatment (S), and control (C) groups. C group received only dextran beads while S and B groups wereĀ given bacteria and dextran beads intraperitoneally, but spironolactone chalcone was also given to SĀ group. The treatments were administered daily. The rats were sacrificed on day 15 to quantify peritonealĀ adhesion and for histological examination of the peritoneal tissues using hematoxylin, eosin andĀ Massonās trichrome dyes. Enzyme-linked immunosorbent assay (ELISA) kit was used to determineĀ TGFĪ²1 content of peritoneal fluids and serum samples.Results: Spironolactone chalcone treatment at a dose of 30 mg/kg body weight daily for 15 daysĀ significantly reduced peritoneal total adhesion score in S group compared to untreated B group (p <Ā 0.01). S group also showed significantly lower mean peritoneal thickness, inflammation score, andĀ fibrosis score compared to B group. Serum transforming growth factor Ī²1 was also reduced significantlyĀ in S group animals on spironolactone chalcone treatment compared to B group.Conclusion: Spironolactone chalcone is a potentially effective candidate for decreasing the extent ofĀ peritoneal injury caused by bacterial peritonitis.Keywords: Peritoneal thickness, Inflammation score, Adhesion score, Bacterial peritonitis, PeritonealĀ fluid
Parameter-tuning Networks: Experiments and Active Walk Model
The tuning process of a large apparatus of many components could be
represented and quantified by constructing parameter-tuning networks. The
experimental tuning of the ion source of the neutral beam injector of HT-7
Tokamak is presented as an example. Stretched-exponential cumulative degree
distributions are found in the parameter-tuning networks. An active walk model
with eight walkers is constructed. Each active walker is a particle moving with
friction in an energy landscape; the landscape is modified by the collective
action of all the walkers. Numerical simulations show that the parameter-tuning
networks generated by the model also give stretched exponential functions, in
good agreement with experiments. Our methods provide a new way and a new
insight to understand the action of humans in the parameter-tuning of
experimental processes, is helpful for experimental research and other
optimization problems.Comment: 4 pages, 5 figure
Insights and guidelines on the Cauchy horizon theorems
Recently there is progress to resolve the issue regarding the non-existence
of the Cauchy horizon inside the static, charged, and spherically symmetric
black holes. However, when we generically extend the black holes' spacetime,
they are not just static but can be dynamical, thus the interior of black holes
does not remain the same as the static case when we take into account the
dynamical evolution of black holes. Then, our aim in this paper is to provide a
few constructive insights and guidelines regarding this issue by revisiting a
few examples of the gravitational collapse of spherically symmetric charged
black holes using the double-null formalism. Our numerical results demonstrate
that the inside of the outer horizon is no longer static even in late time, and
the inner apparent horizon exists but is not regular. The inner apparent
horizon can be distinguished clearly from the Cauchy horizon. The spherical
symmetric property of black holes allows the inner horizon to be defined in two
directions, i.e., the differentiation of the areal radius vanishes along either
the out-going or the in-going null direction. Moreover, the Cauchy horizon can
be generated from a singularity. Still, the notion of the singularity can be
subtle where it can have a vanishing or non-vanishing areal radius; the
corresponding curvature quantities could be finite or diverge, although the
curvatures can be greater than the Planck scale. Finally, we show some examples
that the "hair" which is associated with the matter field on the inner horizon
is not important to determine the existence of the Cauchy horizon; rather, the
hair on the outer horizon might play an important role on the Cauchy horizon.
Therefore, the dynamic properties of the interior of charged black holes could
shed light for us to understand deeply about the Cauchy horizon for the
extensions of no-Cauchy-horizon theorems.Comment: 18 pages, 5 figure
Hairy Reissner-Nordstrom Black Holes with Asymmetric Vacua
We minimally coupled a scalar potential with asymmetric vacua to
the Einstein gravity to numerically construct the hairy Reissner-Nordstrom
black hole (RNBH) as a direct generalization of RNBHs to possess scalar hair.
By fixing the electric charge to mass ratio , a branch of hairy RNBHs
bifurcates from the RNBH when the scalar field is non-trivial at the
horizon. The values of are bounded for , which contrast to
a class of hairy black holes with in the Einstein-Maxwell-scalar theory.
We find that the profiles of solutions affected by the competition between the
strength of and , for instance, the gradient of scalar field at the
horizon can increase very sharply when and is small
but its gradient can be very small which independent of when is
large. Furthermore, the weak energy condition of hairy RNBHs, particularly at
the horizon can be satisfied when .Comment: 11 pages with 9 figure
Applications of Repeated Games in Wireless Networks: A Survey
A repeated game is an effective tool to model interactions and conflicts for
players aiming to achieve their objectives in a long-term basis. Contrary to
static noncooperative games that model an interaction among players in only one
period, in repeated games, interactions of players repeat for multiple periods;
and thus the players become aware of other players' past behaviors and their
future benefits, and will adapt their behavior accordingly. In wireless
networks, conflicts among wireless nodes can lead to selfish behaviors,
resulting in poor network performances and detrimental individual payoffs. In
this paper, we survey the applications of repeated games in different wireless
networks. The main goal is to demonstrate the use of repeated games to
encourage wireless nodes to cooperate, thereby improving network performances
and avoiding network disruption due to selfish behaviors. Furthermore, various
problems in wireless networks and variations of repeated game models together
with the corresponding solutions are discussed in this survey. Finally, we
outline some open issues and future research directions.Comment: 32 pages, 15 figures, 5 tables, 168 reference
Quantum electrodynamics in a whispering-gallery microcavity coated with a polymer nanolayer
Quasi-transverse-electric and -transverse-magnetic fundamental whispering
gallery modes in a polymer-coated silica microtoroid are theoretically
investigated and demonstrated to possess very high-quality factors. The
existence of a nanometer-thickness layer not only evidently reduces the cavity
mode volume but also draws the maximal electric field's position of the mode to
the outside of the silica toroid, where single quantum dots or nanocrystals are
located. Both effects result in a strongly enhanced coherent interaction
between a single dipole (for example, a single defect center in a diamond
crystal) and the quantized cavity mode. Since the coated microtoroid is highly
feasible and robust in experiments, it may offer an excellent platform to study
strong-coupling cavity quantum electrodynamics, quantum information, and
quantum computation
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