1,472 research outputs found
Spaces of Graphs, Boundary Groupoids and the Coarse Baum-Connes Conjecture
We introduce a new variant of the coarse Baum-Connes conjecture designed to
tackle coarsely disconnected metric spaces called the boundary coarse
Baum-Connes conjecture. We prove this conjecture for many coarsely disconnected
spaces that are known to be counterexamples to the coarse Baum-Connes
conjecture. In particular, we give a geometric proof of this conjecture for
spaces of graphs that have large girth and bounded vertex degree. We then
connect the boundary conjecture to the coarse Baum-Connes conjecture using
homological methods, which allows us to exhibit all the current uniformly
discrete counterexamples to the coarse Baum-Connes conjecture in an elementary
way.Comment: 27 pages, added a new section concerned with counterexamples to the
conjectur
Parabolic induction, categories of representations and operator spaces
We study some aspects of the functor of parabolic induction within the
context of reduced group C*-algebras and related operator algebras. We explain
how Frobenius reciprocity fits naturally within the context of operator
modules, and examine the prospects for an operator algebraic formulation of
Bernstein's reciprocity theorem (his second adjoint theorem).Comment: 28 page
A Second Adjoint Theorem for SL(2,R)
We formulate a second adjoint theorem in the context of tempered
representations of real reductive groups, and prove it in the case of SL(2,R).Comment: 38 page
K-theory for the maximal Roe algebra of certain expanders
We study in this paper the maximal version of the coarse Baum-Connes assembly
map for families of expanding graphs arising from residually finite groups.
Unlike for the usual Roe algebra, we show that this assembly map is closely
related to the (maximal) Baum-Connes assembly map for the group and is an
isomorphism for a class of expanders. We also introduce a quantitative
Baum-Connes assembly map and discuss its connections to K-theory of (maximal)
Roe algebras.Comment: 45 page
On the Equivalence of Geometric and Analytic K-Homology
We give a proof that the geometric K-homology theory for finite CW-complexes
defined by Baum and Douglas is isomorphic to Kasparov's K-homology. The proof
is a simplification of more elaborate arguments which deal with the geometric
formulation of equivariant K-homology theory.Comment: 29 pages, v4: corrected definition of E in proof of Prop 3.
Editorial, Seminars in Cell & Developmental Biology
It is a pleasure to introduce this special edition of Cell and Development
Biology dedicated to the field and application of Biosensors. This edition
comprises seven reviews covering the most active research areas where we believe
some of the most prominent advances in the field are likely to emerge in the
near to medium term. In line with scope of this journal, some emphasis is given
towards techniques applicable to Cell Biology
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