29,410 research outputs found
Construction of some families of 2-dimensional crystalline representations
We construct explicitly some analytic families of etale (phi,Gamma)-modules,
which give rise to analytic families of 2-dimensional crystalline
representations. As an application of our constructions, we verify some
conjectures of Breuil on the reduction modulo p of those representations, and
extend some results (of Deligne, Edixhoven, Fontaine and Serre) on the
representations arising from modular forms.Comment: 13 pages, english and french abstract
Generalized Koszul properties for augmented algebras
Under certain conditions, a filtration on an augmented algebra A admits a
related filtration on the Yoneda algebra E(A) := Ext_A(K, K). We show that
there exists a bigraded algebra monomorphism from gr E(A) to E_Gr(gr A), where
E_Gr(gr A) is the graded Yoneda algebra of gr A. This monomorphism can be
applied in the case where A is connected graded to determine that A has the K_2
property recently introduced by Cassidy and Shelton.Comment: 14 page
Up Sector of Minimal Flavor Violation: Top Quark Properties and Direct D meson CP violation
Minimal Flavor Violation in the up-type quark sector leads to particularly
interesting phenomenology due to the interplay of flavor physics in the charm
sector and collider physics from flavor changing processes in the top sector.
We study the most general operators that can affect top quark properties and
meson decays in this scenario, concentrating on two CP violating operators
for detailed studies. The consequences of these effective operators on charm
and top flavor changing processes are generically small, but can be enhanced if
there exists a light flavor mediator that is a Standard Model gauge singlet
scalar and transforms under the flavor symmetry group. This flavor mediator can
satisfy the current experimental bounds with a mass as low as tens of GeV and
explain observed -meson direct CP violation. Additionally, the model
predicts a non-trivial branching fraction for a top quark decay that would
mimic a dijet resonance.Comment: 27 pages, 7 figure
Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs
The top quark forward-backward asymmetry measured at the Tevatron collider
shows a large deviation from standard model expectations. Among possible
interpretations, a non-universal model is of particular interest as
it naturally predicts a top quark in the forward region of large rapidity. To
reproduce the size of the asymmetry, the couplings of the to
standard model quarks must be large, inevitably leading to copious production
of same-sign top quark pairs at the energies of the Large Hadron Collider
(LHC). We explore the discovery potential for and production in
early LHC experiments at 7-8 TeV and conclude that if {\it no} signal is
observed with 1 fb of integrated luminosity, then a non-universal
alone cannot explain the Tevatron forward-backward asymmetry.Comment: Tevatron limit from same-sign tt search adde
Relaxing-Precessional Magnetization Switching
A new way of magnetization switching employing both the spin-transfer torque
and the torque by a magnetic field is proposed. The solution of the
Landau-Lifshitz-Gilbert equation shows that the dynamics of the magnetization
in the initial stage of the switching is similar to that in the precessional
switching, while that in the final stage is rather similar to the relaxing
switching. We call the present method the relaxing-precessional switching. It
offers a faster and lower-power-consuming way of switching than the relaxing
switching and a more controllable way than the precessional switching
Higher Twist Effects in the Drell-Yan Angular Distribution
We study the Drell-Yan process at large
using perturbative QCD. A higher-twist mechanism suggested by Berger and
Brodsky is known to qualitatively explain the observed dependence of the
muon angular distribution, but the predicted large behavior differs
quantitatively from observations. We have repeated the model calculation taking
into account the effects of nonasymptotic kinematics. At fixed-target energies
we find important corrections which improve the agreement with data. The
asymptotic result of Berger and Brodsky is recovered only at much higher
energies. We discuss the generic reasons for the large corrections at high
. A proper understanding of the data would give important
information on the pion distribution amplitude and exclusive form factor.Comment: 8 pages in Latex with 3 figures appended as Postscript files,
HU-TFT-94-12, LBL-35430. (The introductory part has been slightly altered and
three references have been added
MARKETING IN WESTERN VERSUS EASTERN CULTURE – COMPARING AND CONTRASTING BETWEEN THE U.S. AND JAPAN
In this paper we consider differences in marketing in Western vs. Eastern cultures and use the United States and Japan as the primary, but not exclusive, focus of our discussion. We first consider the general issue of companies trading internationally, and home in on the U.S. and Japan. We consider corporate cultures and examine a deeper look at the U.S. vs. Japan along a set of six dimensions, and we distinguish between internal and external aspects. We use case studies of three companies to illustrate our points, and end with a noting of our conclusions and managerial implications and some advice for companies seeking to enter the Japanese market
- …