Pairwise thermal entanglement in Ising-XYZ diamond chain structure in an external magnetic field

Quantum entanglement is one of the most fascinating types of correlation that can be shared only among quantum systems. The Heisenberg chain is one of the simplest quantum chains which exhibits a reach entanglement feature, due to the Heisenberg interaction is quantum coupling in the spin system. The two particles were coupled trough XYZ coupling or simply called as two-qubit XYZ spin, which are the responsible for the emergence of thermal entanglement. These two-qubit operators are bonded to two nodal Ising spins, and this process is repeated infinitely resulting in a diamond chain structure. We will discuss two-qubit thermal entanglement effect on Ising-XYZ diamond chain structure. The concurrence could be obtained straightforwardly in terms of two-qubit density operator elements, using this result, we study the thermal entanglement, as well as the threshold temperature where entangled state vanishes. The present model displays a quite unusual concurrence behavior, such as, the boundary of two entangled regions becomes a disentangled region, this is intrinsically related to the XY-anisotropy in the Heisenberg coupling. Despite a similar property had been found for only two-qubit, here we show in the case of a diamond chain structure, which reasonably represents real materials.Comment: 6 pages, 7 figure

Gender, the body and organization studies: que(e)rying empirical research

Even in organization studies scholarship that treats gender as performative and fluid, a certain ‘crystallization’ of gender identities as somehow unproblematic and stable may occur because of our methodological decision-making, and especially our categorization of participants. Mobilizing queer theory — and Judith Butler's work on the heterosexual matrix and performativity in particular — as a conceptual lens, we examine this crystallization, suggesting it is based on two implicit assumptions: that gender is a cultural mark over a passive biological body, or is a base identity ‘layered over’ by other identities (class, race, age etc.). Following Butler, we argue that in order to foreground the fluidity and uncertainty of gender categories in our scholarship, it is necessary to understand gender identity as a process of doing and undoing gender that is located very precisely in time and space. Given this perspective on gender identities as complex processes of identification, non-identification and performativity, we offer some pointers on how the methodological decision-making underpinning empirical research on gender, work and organization could and should begin from this premise

Queering queer theory in management and organization studies: notes toward queering heterosexuality

This article suggests new possibilities for queer theory in management and organization studies (MOS). MOS has tended to use queer theory as a conceptual resource for studying the workplace experience of ‘minorities’ such as gay men, lesbians and those identifying as bisexual or transgender (LGBT), often focusing on how heteronormativity shapes the discursive constitution of sexualities and genders coded as LGBT. But this deployment is crucial and apposite but it can limit the analytical reach of queer theory, ignoring other objects of analysis such as heterosexuality. Potentially, MOS queer theory scholarship could be vulnerable to criticism about ignoring queer theory as a productive site for acknowledging heterosexuality’s coercive aspects but also its non-normative forms. As such, the principal contribution of this article is twofold. First, it proposes a queering of queer theory in MOS, whereby scholars are alert to and question the potential normativities that MOS queer theory research can produce, opening up a space for exploring how heterosexuality can be queered. Second, we show how queering heterosexuality can be another site where queer theory and politics can come together in the MOS field through a shared attempt to rupture sexual and gender binaries, and challenge normative social relations. This article concludes by outlining the political implications of queering heterosexuality for generating modes of organizing in which heterosexuality can be experienced as non-normative and how it might rupture and dismantle heteronormativity

Quadratic Effective Action for QED in D=2,3 Dimensions

We calculate the effective action for Quantum Electrodynamics (QED) in D=2,3 dimensions at the quadratic approximation in the gauge fields. We analyse the analytic structure of the corresponding nonlocal boson propagators nonperturbatively in k/m. In two dimensions for any nonzero fermion mass, we end up with one massless pole for the gauge boson . We also calculate in D=2 the effective potential between two static charges separated by a distance L and find it to be a linearly increasing function of L in agreement with the bosonized theory (massive Sine-Gordon model). In three dimensions we find nonperturbatively in k/m one massive pole in the effective bosonic action leading to screening. Fitting the numerical results we derive a simple expression for the functional dependence of the boson mass upon the dimensionless parameter e^{2}/m .Comment: 10 pages, 2 figure

Major Anthropogenic Causes for and Outcomes of Wild Animal Presentation to a Wildlife Clinic in East Tennessee, USA, 2000–2011

To determine the reasons for presentation and outcome of wildlife cases in East Tennessee, a retrospective analysis was performed using 14,303 records from cases presented to the wildlife clinic of the University of Tennessee Veterinary Teaching Hospital between 2000 and 2011. The cases were first categorized into amphibian/non-avian reptile, mammal, or avian and then classified into groups based on the primary admitting/presenting sign. There are a variety of reasons animals were presented to the clinic, and some were directly or indirectly anthropogenic in origin, including cat related, dog related, hit by automobile, and other human encounters leading to trauma; of the cases reviewed, 4,443 (31.1%) presented for one of these 4 reasons. Overall case fatality risk in regard to these 4 admitting/presenting signs was 0.519 for the amphibian/non-avian reptile cases, 0.675 for mammal cases, and 0.687 for avian cases. This study confirms the importance of monitoring wildlife morbidity and mortality and of focusing efforts to reduce the anthropogenic threat on native habitats and resident wildlife populations

Near-barrier Fusion Induced by Stable Weakly Bound and Exotic Halo Light Nuclei

The effect of breakup is investigated for the medium weight $^{6}$Li+$^{59}$Co system in the vicinity of the Coulomb barrier. The strong coupling of breakup/transfer channels to fusion is discussed within a comparison of predictions of the Continuum Discretized Coupled-Channels model which is also applied to $^{6}$He+$^{59}$Co a reaction induced by the borromean halo nucleus $^{6}$He.Comment: 6 pages, 3 figures. A talk given at the FUSION06: International Conference on Reaction Mechanisms and Nuclear Structure at the Coulomb barrier, March 19-23, 2006, San Servolo, Venezia, Ital

Signature of the interaction between dark energy and dark matter in observations

We investigate the effect of an interaction between dark energy and dark matter upon the dynamics of galaxy clusters. This effect is computed through the Layser-Irvine equation, which describes how an astrophysical system reaches virial equilibrium and was modified to include the dark interactions. Using observational data from almost 100 purportedly relaxed galaxy clusters we put constraints on the strength of the couplings in the dark sector. We compare our results with those from other observations and find that a positive (in the sense of energy flow from dark energy to dark matter) non vanishing interaction is consistent with the data within several standard deviations.Comment: 13 pages, 3 figures; matches PRD published versio