14,869 research outputs found
A theory of the Io phase asymmetry of the Jovian decametric radiation
An explanation of an asymmetry in the occurrence probability of the Io-dependent Jovian decametric radiation is proposed. Io generates stronger Alfven waves toward the south when it is in the northern part of the torus. This wave then generates decametric radiation in the northern ionosphere after it reflects in the southern ionosphere. The asymmetry then results from computing the propagation time of the alfven wave along this trajectory. The ray paths of the decameter radiation are calculated using a three dimensional ray tracing program in the Jovian ionosphere. Variations in the expected probability plots are computer for two models of the Jovian ionosphere and global magnetic field, as well as for several choices of the ratio of the radiated frequency to the X-mode cutoff frequency
-prime and -primary -ideals on -schemes
Let be a flat finite-type group scheme over a scheme , and a
noetherian -scheme on which -acts. We define and study -prime and
-primary -ideals on and study their basic properties. In particular,
we prove the existence of minimal -primary decomposition and the
well-definedness of -associated -primes. We also prove a generalization
of Matijevic-Roberts type theorem. In particular, we prove Matijevic-Roberts
type theorem on graded rings for -regular and -rational properties.Comment: 54pages, added Example 6.16 and the reference [8]. The final versio
Dynamical electroweak symmetry breaking with superheavy quarks and 2+1 composite Higgs model
Recently, a new class of models describing the quark mass hierarchy has been
introduced. In this class, while the t quark plays a minor role in electroweak
symmetry breaking (EWSB), it is crucial in providing the quark mass hierarchy.
In this paper, we analyze the dynamics of a particular model in this class, in
which the b' and t' quarks of the fourth family are mostly responsible for
dynamical EWSB. The low energy effective theory in this model is derived. It
has a clear signature, a 2 + 1 structure of composite Higgs doublets: two
nearly degenerate \Phi_{b'} and \Phi_{t'}, and a heavier top-Higgs resonance
\Phi_t \sim \bar{t}_{R}(t,b)_L. The properties of these composites are
described in detail, and it is shown that the model satisfies the electroweak
precision data constraints. The signatures of these composites at the Large
Hadron Collider are briefly discussed.Comment: 17 pages, 3 figures; v.2: references and clarifications added: PRD
versio
Ihara's zeta function for periodic graphs and its approximation in the amenable case
In this paper, we give a more direct proof of the results by Clair and
Mokhtari-Sharghi on the zeta functions of periodic graphs. In particular, using
appropriate operator-algebraic techniques, we establish a determinant formula
in this context and examine its consequences for the Ihara zeta function.
Moreover, we answer in the affirmative one of the questions raised by
Grigorchuk and Zuk. Accordingly, we show that the zeta function of a periodic
graph with an amenable group action is the limit of the zeta functions of a
suitable sequence of finite subgraphs.Comment: 21 pages, 4 figure
Non-commutativity and Open Strings Dynamics in Melvin Universes
We compute the Moyal phase factor for open strings ending on D3-branes
wrapping a NSNS Melvin universe in a decoupling limit explicitly using world
sheet formalism in cylindrical coordinates.Comment: 12 pages, 1 figure, references adde
Coupled-channel calculation of bound and resonant spectra of Lambda-9Be and Lambda-13C hypernuclei
A Multi-Channel Algebraic Scattering (MCAS) approach has been used to analyze
the spectra of two hyper-nuclear systems, Lambda-9Be and Lambda-13C. The
splitting of the two odd-parity excited levels (1/2^- and 3/2^-) at 11 MeV
excitation in Lambda-13C is driven mainly by the weak Lambda-nucleus spin-orbit
force, but the splittings of the 3/2^+ and 5/2^+ levels in both Lambda-9Be and
Lambda-13C have a different origin. These cases appear to be dominated by
coupling to the collective 2+ states of the core nuclei. Using simple
phenomenological potentials as input to the MCAS method, the observed splitting
and level ordering in Lambda-9Be is reproduced with the addition of a weak
spin-spin interaction acting between the hyperon and the spin of the excited
target. With no such spin-spin interaction, the level ordering in Lambda-9Be is
inverted with respect to that currently observed. In both hyper-nuclei, our
calculations suggest that there are additional low-lying resonant states in the
Lambda-nucleus continua.Comment: 15 pages, 3 figures, 6 tables. To be published in International
Journal of Modern Physics
Continuous variable entanglement on a chip
Encoding quantum information in continuous variables (CV)---as the quadrature
of electromagnetic fields---is a powerful approach to quantum information
science and technology. CV entanglement---light beams in
Einstein-Podolsky-Rosen (EPR) states---is a key resource for quantum
information protocols; and enables hybridisation between CV and single photon
discrete variable (DV) qubit systems. However, CV systems are currently limited
by their implementation in free-space optical networks: increased complexity,
low loss, high-precision alignment and stability, as well as hybridisation,
demand an alternative approach. Here we show an integrated photonic
implementation of the key capabilities for CV quantum technologies---generation
and characterisation of EPR beams in a photonic chip. Combined with integrated
squeezing and non-Gaussian operation, these results open the way to universal
quantum information processing with light
Non-Linear/Non-Commutative Non-Abelian Monopoles
Using recently proposed non-linearly realized supersymmetry in non-Abelian
gauge theory corrected to the order (alpha')^2, we derive the non-linear BPS
equations in the background B-field for the U(2) monopoles and instantons. We
show that these non-Abelian non-linear BPS equations coincide with the
non-commutative anti-self-dual equations via the Seiberg-Witten map.Comment: 9 pages, LaTe
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