83,024 research outputs found
Lightening Global Types
Global session types prevent participants from waiting for never coming
messages. Some interactions take place just for the purpose of informing
receivers that some message will never arrive or the session is terminated. By
decomposing a big global type into several light global types, one can avoid
such kind of redundant interactions. Lightening global types gives us cleaner
global types, which keep all necessary communications. This work proposes a
framework which allows to easily decompose global types into light global
types, preserving the interaction sequences of the original ones but for
redundant interactions.Comment: In Proceedings PLACES 2014, arXiv:1406.331
Polarization phenomena in hyperon-nucleon scattering
We investigate polarization observables in hyperon-nucleon scattering by
decomposing scattering amplitudes into spin-space tensors, where each component
describes scattering by corresponding spin-dependent interactions, so that
contributions of the interactions in the observables are individually
identified. In this way, for elastic scattering we find some linear
combinations of the observables sensitive to particular spin-dependent
interactions such as symmetric spin-orbit (LS) interactions and antisymmetric
LS ones. These will be useful to criticize theoretical predictions of the
interactions when the relevant observables are measured. We treat vector
analyzing powers, depolarizations, and coefficients of polarization transfers
and spin correlations, a part of which is numerically examined in scattering as an example. Total cross sections are studied for polarized
beams and targets as well as for unpolarized ones to investigate spin
dependence of imaginary parts of forward scattering amplitudes.Comment: 15 pages, 8 figure
Higher Spins and Stringy AdS5xS5
In this lecture I review recent work on higher spin holography. After a
notational flash on the AdS/CFT correspondence, I will discuss HS symmetry
enhancement and derive the spectrum of perturbative type IIB superstring
excitations on AdS5 in this limit. I will then successfully compare it with the
free N=4 SYM spectrum obtained by means of Polya theory. Decomposing the
spectrum in HS multiplets, I will eventually sketch how ``La Grande Bouffe''
can be formulated a` la Stueckelberg.Comment: 40 pages, Latex, uses youngtab.sty. Lecture delivered at the RTN
Workshop "The quantum structure of spacetime and the geometric nature of
fundamental interactions", EXT Workshop "Fundamental Interactions and the
Structure of Spacetime" in Kolymbari, Crete, 5-10 September 200
Modal Approach to Casimir Forces in Periodic Structures
We present a modal approach to calculate finite temperature Casimir
interactions between two periodically modulated surfaces. The scattering
formula is used and the reflection matrices of the patterned surfaces are
calculated decomposing the electromagnetic field into the natural modes of the
structures. The Casimir force gradient from a deeply etched silicon grating is
evaluated using the modal approach and compared to experiment for validation.
The Casimir force from a two dimensional periodic structure is computed and
deviations from the proximity force approximation examined.Comment: 13 pages, 7 figure
Large gauge invariant non-standard neutrino interactions
Theories beyond the Standard Model must necessarily respect its gauge
symmetry. This implies strict constraints on the possible models of
non-standard neutrino interactions, which we analyze. The focus is set on the
effective low-energy dimension six and eight operators involving four leptons,
decomposing them according to all possible tree-level mediators, as a guide for
model building. The new couplings are required to have sizeable strength, while
processes involving four charged leptons are required to be suppressed. For
non-standard interactions in matter, only diagonal tau-neutrino interactions
can escape these requirements and can be allowed to result from dimension six
operators. Large non-standard neutrino interactions from dimension eight
operators alone are phenomenologically allowed in all flavour channels and
shown to require at least two new mediator particles. The new couplings must
obey general cancellation conditions both at the dimension six and eight
levels, which result from expressing the operators obtained from the mediator
analysis in terms of a complete basis of operators. We illustrate with one
example how to apply this information to model building.Comment: 34 pages, 4 figures, 5 tables. Final version in PR
Welfare Stigma or Information Sharing? Decomposing Social Interactions Effects in Social Benefit Use
Empirical research has shown that social interactions affect the use of public benefits, thus providing evidence in favor of the idea of âwelfare cultures.â In this paper we take the next crucial step by separately identifying the role of social stigma and information sharing in welfare participation, using Census data. We argue that the stigma vs. information distinction has possibly important consequences. Separate identification exploits the asymmetry between association and mere spatial proximity: we asume that while information is transmitted within groups, stigma works across groups as well. We also allow for heterogeneity of social effects across different race-ethnic groups and find non-trivial differences. We find that while the information channel is more important than stigma, White Americans appear to perceive stigma more from otherWhite Americans than by other races, and Black and Hispanic Americans appear to respond principally to stigma from external groupssocial interactions, neighborhood effects, welfare stigma
Understanding interdependency through complex information sharing
The interactions between three or more random variables are often nontrivial,
poorly understood, and yet, are paramount for future advances in fields such as
network information theory, neuroscience, genetics and many others. In this
work, we propose to analyze these interactions as different modes of
information sharing. Towards this end, we introduce a novel axiomatic framework
for decomposing the joint entropy, which characterizes the various ways in
which random variables can share information. The key contribution of our
framework is to distinguish between interdependencies where the information is
shared redundantly, and synergistic interdependencies where the sharing
structure exists in the whole but not between the parts. We show that our
axioms determine unique formulas for all the terms of the proposed
decomposition for a number of cases of interest. Moreover, we show how these
results can be applied to several network information theory problems,
providing a more intuitive understanding of their fundamental limits.Comment: 39 pages, 4 figure
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