A Langevin canonical approach to the dynamics of two level systems. I. Populations and coherences

A canonical framework for chiral two--level systems coupled to a bath of harmonic oscillators is developed to extract, from a stochastic dynamics, the thermodynamic equilibrium values of both the population difference and coherences. The incoherent and coherent tunneling regimes are analyzed for an Ohmic environment in terms of a critical temperature defined by the maximum of the heat capacity. The corresponding numerical results issued from solving a non-linear coupled system are fitted to approximate path--integral analytical expressions beyond the so-called non-interacting blip approximation in order to determine the different time scales governing both regimes.Comment: 8 pages, 4 figures, 1 tabl

To be Makiran is to see like Mr Parrot: the anthropology of wonder in Solomon Islands

This article lays out a general thesis for the development of a comparative ethnographic approach to the anthropology of wonder. It suggests that wonder is both an index and a mode of challenge to existing ontological premises. Through analytical engagement with the theme of wonder in Western philosophy and the anthropology of ontology, it extends this thesis to include the corollary that different ontological premises give rise to different wonders. Ethnographically, the article supports these claims via analysis of wonder discourses among the Arosi of Solomon Islands. These discourses, it is argued, both respond to and promote ontological transformations in a context where the premises at stake are neither those of the Cartesian dualism commonly ascribed to modernity nor of the relational non-dualism commonly ascribe to anthropology’s ethnographic ‘others’, but of a non-Cartesian pluralism termed poly-ontology

Encountering Supai: An Ecology of Spiritual Perception in the Ecuadorian Amazon

In this article I set out to draw an “ecology” of spiritual perception among the Runa of the Ecuadorian Amazon. In particular, I look at the ways in which supai beings—forest spirits—are perceived by the Runa through two main sensory modalities: smelling and dreaming. Inspired by recent advances in the anthropology of religious learning, I then explore how certain Runa people—those who have undertaken a bodily training known as sasi—are more likely than others to encounter supai beings. This ritual training is conceived as corporeal learning. I conclude by suggesting that attention and self-attention developed during such corporeal practices play a central role in the perception of forest spirits

Religiousness as tourist performances: a case study of Greek Orthodox pilgrimage

The aim of this paper is to decipher ways of experiencing religiousness through tourist performances, intersecting textual approaches with the essential embodiment and materiality of the tourist world. Exploring the diversity of religious tourists’ practices within the Greek Orthodox context, two dimensions underpinning religious tourist experience are highlighted: institutional performances and unconventional performances. Focussing on the embodied experience and drawing upon theories of performance, the paper critiques the interplays of body and place to re-conceptualise current understanding of the pilgrimage/tourism relationship. In doing so, the paper proposes that tourism and religion are not separate entities but linked through embodied notions of godliness sensed through touristic performances

The Aesthetics of Everyday Literacies: Home Writing Practices in a British Asian Household

This article explores young people's home literacy practices drawing on an ethnographic study of writing in the home of a British Asian family living in northern England. The theoretical framework comes from the New Literacy Studies, and aesthetic and literary theory. It applies an ethnographic methodology together with an engaged approach to coproduction with young people. The article explores three instances of home writing in relation to textiles, gardening, and the experience of racial harassment

Cracking the BAFF code.

The tumour necrosis factor (TNF) family members B cell activating factor (BAFF) and APRIL (a proliferation-inducing ligand) are crucial survival factors for peripheral B cells. An excess of BAFF leads to the development of autoimmune disorders in animal models, and high levels of BAFF have been detected in the serum of patients with various autoimmune conditions. In this Review, we consider the possibility that in mice autoimmunity induced by BAFF is linked to T cell-independent B cell activation rather than to a severe breakdown of B cell tolerance. We also outline the mechanisms of BAFF signalling, the impact of ligand oligomerization on receptor activation and the progress of BAFF-depleting agents in the clinical setting

The Cultural Project : Formal Chronological Modelling of the Early and Middle Neolithic Sequence in Lower Alsace

Starting from questions about the nature of cultural diversity, this paper examines the pace and tempo of change and the relative importance of continuity and discontinuity. To unravel the cultural project of the past, we apply chronological modelling of radiocarbon dates within a Bayesian statistical framework, to interrogate the Neolithic cultural sequence in Lower Alsace, in the upper Rhine valley, in broad terms from the later sixth to the end of the fifth millennium cal BC. Detailed formal estimates are provided for the long succession of cultural groups, from the early Neolithic Linear Pottery culture (LBK) to the Bischheim Occidental du Rhin Supérieur (BORS) groups at the end of the Middle Neolithic, using seriation and typology of pottery as the starting point in modelling. The rate of ceramic change, as well as frequent shifts in the nature, location and density of settlements, are documented in detail, down to lifetime and generational timescales. This reveals a Neolithic world in Lower Alsace busy with comings and goings, tinkerings and adjustments, and relocations and realignments. A significant hiatus is identified between the end of the LBK and the start of the Hinkelstein group, in the early part of the fifth millennium cal BC. On the basis of modelling of existing dates for other parts of the Rhineland, this appears to be a wider phenomenon, and possible explanations are discussed; full reoccupation of the landscape is only seen in the Grossgartach phase. Radical shifts are also proposed at the end of the Middle Neolithic