2,519 research outputs found
Hodge structures associated to SU(p,1)
Let A be an abelian variety over C such that the semisimple part of the Hodge
group of A is a product of copies of SU(p,1) for some p>1. We show that any
effective Tate twist of a Hodge structure occurring in the cohomology of A is
isomorphic to a Hodge structure in the cohomology of some abelian variety
Friction vs Texture at the Approach of a Granular Avalanche
We perform a novel analysis of the granular texture of a granular bed close
to stability limit. Our analysis is based on a unique criterion of friction
mobilisation in a simulated two-dimensional packing. In this way, we recover
the bimodal character of granular texture, and the coexistence of weak and
strong phases in the sense of distinct contacts populations. Moreover, we show
the existence of a well-defined subset of contacts within the weak contact
network. These contacts are characterized by their important friction, and form
a highly coherent population in terms of fabric. They play an antagonistic role
with respect to force chains. We are thus able to discriminate between
incoherent contacts and coherent contacts in the weak phase, and to specify the
role that the latter plays in the destabilisation process.Comment: 4 pages, 6 figure
Second quantized Frobenius algebras
We show that given a Frobenius algebra there is a unique notion of its second
quantization, which is the sum over all symmetric group quotients of n--th
tensor powers, where the quotients are given by symmetric group twisted
Frobenius algebras. To this end, we consider the setting of Frobenius algebras
given by functors from geometric categories whose objects are endowed with
geometric group actions and prove structural results, which in turn yield a
constructive realization in the case of n--th tensor powers and the natural
permutation action. We also show that naturally graded symmetric group twisted
Frobenius algebras have a unique algebra structure already determined by their
underlying additive data together with a choice of super--grading. Furthermore
we discuss several notions of discrete torsion andshow that indeed a
non--trivial discrete torsion leads to a non--trivial super structure on the
second quantization.Comment: 39p. Latex. New version fixes sign mistake and includes the full
description of discrete torsio
Source parameters of the 1957 Aleutian Earthquake from tsunami waveforms
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94584/1/grl6779.pd
Rupture extent of the 1938 Alaskan earthquake as inferred from tsunami waveforms
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94754/1/grl7445.pd
Redox States of Geochemically-Enriched Shergottites as Inferred from Fe Micro-XANES Analysis of Maskelynite and Plagioclase.
第2回極域科学シンポジウム/第34回南極隕石シンポジウム 11月18日(金) 国立国語研究所 2階講
A Model for Granular Texture with Steric Exclusion
We propose a new method to characterize the geometrical texture of a granular
packing at the particle scale including the steric hindrance effect. This
method is based on the assumption of a maximum disorder (entropy) compatible
both with strain-induced anisotropy of the contact network and steric
exclusions. We show that the predicted statistics for the local configurations
is in a fairly agreement with our numerical data.Comment: 9 pages, 5 figure
Numerical Calculation of the Ion Thermal Conductivity by Lagrangian Neoclassical Transport Theory
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