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Cotonou, Benin

Amoussou Y.C.,University Abomey Calavi
International Journal of Applied Linguistics and English Literature | Year: 2016

This paper explores the textual metafunctional patterns in two fictional versions of a Biblical Parable in Ngũgĩ wa Thiong’o’s novel Devil on the Cross (1982) in order to find the similarities and differences between their compositional features. It critically draws on the theory of systemic functional linguistics expounded by specialists like Halliday (1994), Halliday and Matthiessen (2004) and Eggins (2004) to overview the theoretical background to the study, with focus on the grammar of textual meaning, proposes a new Theme classification and uses it to analyze the Thematic structure and taxis system of the two extracts. The researcher has come to the conclusion that, though they are initially spoken, these texts show such interesting textual-meaning properties as the density of ellipsis, of circumstantial and interpersonal thematization, of taxis and rank shift that they should be qualified to belong to both spoken and written mode of discourse. © 2016, Australian International Academic Centre PTY LTD. All rights reserved. Source

Samary D.O.,University Abomey Calavi
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

This manuscript reports the first order β-functions of recently proved just renormalizable random tensor models endowed with a U(1)d gauge invariance. The models that we consider are polynomial Abelian φ64 and φ56 models. We show in this work that both models are asymptotically free in the UV. © 2013 American Physical Society. Source

Ousmane Samary D.,Perimeter Institute for Theoretical Physics | Ousmane Samary D.,University Abomey Calavi
Classical and Quantum Gravity | Year: 2014

In this paper, we provide the closed equations that satisfy two-point correlation functions of rank 3 and 4 tensorial group field theory. The formulation of the current problem extends the method used by Grosse and Wulkenhaar (2009 arXiv:0909.1389) to the tensor case. Ward - Takahashi identities and Schwinger - Dyson equations are combined to establish a nonlinear integral equation for the two-point functions. In the three-dimensional case, the solution of this equation is given perturbatively at the second order of the coupling constant. © 2014 IOP Publishing Ltd. Source

The demographic impacts of harvesting nontimber forest products (NTFP) have been increasingly studied because of reports of potentially unsustainable harvest. Nevertheless, our understanding of how plant demographic response to harvest is altered by variation in ecological conditions, which is critical for developing realistic sustainable-use plans, is limited. We built matrix population models to test whether and how variation in ecological conditions affects population responses to harvest. In particular, we examined the effect of bark and foliage harvest on the demography of populations of African mahogany (Khaya senegalensis) in two contrasting ecological regions of Benin, West Africa. K. senegalensis bark and foliage harvest significantly reduced its stochastic population growth rates, but ecological differences between regions had a greater effect on population growth rates than did harvest. The effect of harvest on population growth rates (Δλ) was slightly stronger in the moist than in the drier region. Life-table response experiments revealed that the mechanism by which harvesting reduced λ differed between ecological regions. Lowered stasis (persistence) of larger life stages lead to a reduction in λ in the drier region, whereas lowered growth of all life stages lowered λ in moist region. Potential strategies to increase population growth rates should include decreasing the proportion of individuals harvested, promoting harvester-owned plantations of African mahogany, and increasing survival and growth by promoting no-fire zones in gallery forests. Our results show how population responses to harvest of NTFP may be altered by ecological differences across sites and emphasize the importance of monitoring populations over the climatic range in which they occur to develop more realistic recommendations for conservation. © 2009 Society for Conservation Biology. Source

Geloun J.B.,Perimeter Institute for Theoretical Physics | Geloun J.B.,University Abomey Calavi | Rivasseau V.,University Paris - Sud
Communications in Mathematical Physics | Year: 2013

We prove that an integrated version of the Gurau colored tensor model supplemented with the usual Bosonic propagator on U(1)4 is renormalizable to all orders in perturbation theory. The model is of the type expected for quantization of space-time in 4D Euclidean gravity and is the first example of a renormalizable model of this kind. Its vertex and propagator are four-stranded like in 4D group field theories, but without gauge averaging on the strands. Surprisingly perhaps, the model is of the φ{symbol}6 rather than of the φ{symbol}4 type, since two different φ{symbol}6-type interactions are log-divergent, i. e. marginal in the renormalization group sense. The renormalization proof relies on a multiscale analysis. It identifies all divergent graphs through a power counting theorem. These divergent graphs have internal and external structure of a particular kind called melonic. Melonic graphs dominate the 1/N expansion of colored tensor models and generalize the planar ribbon graphs of matrix models. A new locality principle is established for this category of graphs which allows to renormalize their divergences through counterterms of the form of the bare Lagrangian interactions. The model also has an unexpected anomalous log-divergent (∫ φ{symbol}2)2 term, which can be interpreted as the generation of a scalar matter field out of pure gravity. © 2012 Springer-Verlag. Source

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