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Splitting the relative assembly map, Nil-terms and involutions  [PDF]
Wolfgang Lueck,Wolfgang Steimle
Mathematics , 2015,
Abstract: We show that the relative Farrell-Jones assembly map from the family of finite subgroups to the family of virtually cyclic subgroups for algebraic K-theory is split injective in the setting where the coefficients are additive categories with group action. This generalizes a result of Bartels for rings as coefficients. We give an explicit description of the relative term. This enables us to show that it vanishes rationally if we take coefficients in a regular ring. Moreover, it is, considered as a Z[Z/2]-module by the involution coming from taking dual modules, an extended module and in particular all its Tate cohomology groups vanish, provided that the infinite virtually cyclic subgroups of type I of G are orientable. The latter condition is for instance satisfied for torsionfree hyperbolic groups.
Relative geometric assembly and mapping cones  [PDF]
Robin J. Deeley,Magnus Goffeng
Mathematics , 2015,
Abstract: Relative geometric (i.e., Baum-Douglas type) models for morphisms constructed from homomorphisms between discrete groups are defined and studied. In particular, the relative assembly mapping for free actions studied by Chang-Weinberger-Yu is described geometrically. This geometrically defined assembly map is compared to Chang-Weinberger-Yu's map by means of higher Atiyah-Patodi-Singer index theory. At a technical level, the construction of isomorphisms from relative geometric models (both for coefficients and for Yu's localization algebras) is the heart of the matter.
Descent and the $KH$-assembly map  [PDF]
Paul D. Mitchener
Mathematics , 2012,
Abstract: In this article we show that a general notion of descent in coarse geometry can be applied to the study of injectivity of the $KH$-assembly map. We also show that the coarse assembly map is injective in general for ?finite coarse $CW$-complexes.
Dualizing the coarse assembly map  [PDF]
Heath Emerson,Ralf Meyer
Mathematics , 2004, DOI: 10.1017/S147474800500023X
Abstract: We formulate and study a new coarse (co-)assembly map. It involves a modification of the Higson corona construction and produces a map dual in an appropriate sense to the standard coarse assembly map. The new assembly map is shown to be an isomorphism in many cases. For the underlying metric space of a group, the coarse co-assembly map is closely related to the existence of a dual Dirac morphism and thus to the Dirac dual Dirac method of attacking the Novikov conjecture.
The Analytical Assembly Map and Index Theory  [PDF]
Markus Land
Mathematics , 2013,
Abstract: In this paper we study the index theoretic interpretation of the analytical assembly map that appears in the Baum-Connes conjecture. In its general form it may be constructed using Kasparov's equivariant KK-theory. In the special case of a torsionfree group the domain simplifies to the usual K-homology of the classifying space BG of G and it is frequently used that in this case the analytical assembly map is given by assigning to an operator an equivariant index. We give a precise formulation of this statement and prove it.
On the domain of the assembly map in algebraic K-theory  [PDF]
Arthur C. Bartels
Mathematics , 2003, DOI: 10.2140/agt.2003.3.1037
Abstract: We compare the domain of the assembly map in algebraic K-theory with respect to the family of finite subgroups with the domain of the assembly map with respect to the family of virtually cyclic subgroups and prove that the former is a direct summand of the later.
Diffusion and localization for the Chirikov typical map  [PDF]
Klaus M. Frahm,Dima L. Shepelyansky
Physics , 2009, DOI: 10.1103/PhysRevE.80.016210
Abstract: We consider the classical and quantum properties of the "Chirikov typical map", proposed by Boris Chirikov in 1969. This map is obtained from the well known Chirikov standard map by introducing a finite number $T$ of random phase shift angles. These angles induce a random behavior for small time scales ($tT$). We identify the classical chaos border $k_c\sim T^{-3/2} \ll 1$ for the kick parameter $k$ and two regimes with diffusive behavior on short and long time scales. The quantum dynamics is characterized by the effect of Chirikov localization (or dynamical localization). We find that the localization length depends in a subtle way on the two classical diffusion constants in the two time-scale regime.
Higher Whitehead torsion and the geometric assembly map  [PDF]
Wolfgang Steimle
Mathematics , 2011, DOI: 10.1112/jtopol/jts013
Abstract: We construct a higher Whitehead torsion map, using algebraic K-theory of spaces, and show that it satisfies the usual properties of the classical Whitehead torsion. This is used to describe a "geometric assembly map" defined on stabilized structure spaces in purely homotopy theoretic terms.
Study of localization in the quantum sawtooth map emulated on a quantum information processor  [PDF]
Michael K. Henry,Joseph Emerson,Rudy Martinez,David G. Cory
Physics , 2005, DOI: 10.1103/PhysRevA.74.062317
Abstract: Quantum computers will be unique tools for understanding complex quantum systems. We report an experimental implementation of a sensitive, quantum coherence-dependent localization phenomenon on a quantum information processor (QIP). The localization effect was studied by emulating the dynamics of the quantum sawtooth map in the perturbative regime on a three-qubit QIP. Our results show that the width of the probability distribution in momentum space remained essentially unchanged with successive iterations of the sawtooth map, a result that is consistent with localization. The height of the peak relative to the baseline of the probability distribution did change, a result that is consistent with our QIP being an ensemble of quantum systems with a distribution of errors over the ensemble. We further show that the previously measured distributions of control errors correctly account for the observed changes in the probability distribution.
Relative localization of gravitational fields  [PDF]
Yuri A. Rylov
Physics , 2011,
Abstract: A natural two-metric formalism, generated by the world function of the space-time, is used. This circumstance admits one to localize the relative gravitational field, which is described by a tensor.
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