Literature, planning and infrastructure: Investigating the southern city through postcolonial texts

This article explores the ways in which postcolonial literary and other cultural texts navigate, decode and in some cases re-imagine the infrastructures that organize urban life, particularly in the postcolonial cities of Johannesburg, London and Delhi. Readings of Ivan Vladislavić, Mark Gevisser Brian Chikwava, Selma Dabbagh, Rana Dasgupta and Manju Kapur consider the constantly shifting relationship between urban planning, the organization of public space, and various other forms of human intervention, and suggest that the ways in which urban spaces are mapped in creative practice can explore, negotiate and at times disrupt and reconstruct that relationship

Zero Energy of Plane-Waves for ELKOs

We consider the ELKO field in interaction through contorsion with its own spin density, and we investigate the form of the consequent autointeractions; to do so we take into account the high-density limit and find plane wave solutions: such plane waves give rise to contorsional autointeractions for which the Ricci metric curvature vanishes and therefore the energy density is equal to zero identically. Consequences are discussed.Comment: 7 page

The stability of Einstein static universe in the DGP braneworld

The stability of an Einstein static universe in the DGP braneworld scenario is studied in this paper. Two separate branches denoted by $\epsilon=\pm1$ of the DGP model are analyzed. Assuming the existence of a perfect fluid with a constant equation of state, $w$, in the universe, we find that, for the branch with $\epsilon=1$, there is no a stable Einstein static solution, while, for the case with $\epsilon=-1$, the Einstein static universe exists and it is stable when $-1<w<-1/3$. Thus, the universe can stay at this stable state past-eternally and may undergo a series of infinite, non-singular oscillations. Therefore, the big bang singularity problem in the standard cosmological model can be resolved.Comment: 10 pages, 2 figures, to appear in PL

Dark spinor models in gravitation and cosmology

We introduce and carefully define an entire class of field theories based on non-standard spinors. Their dominant interaction is via the gravitational field which makes them naturally dark; we refer to them as Dark Spinors. We provide a critical analysis of previous proposals for dark spinors noting that they violate Lorentz invariance. As a working assumption we restrict our analysis to non-standard spinors which preserve Lorentz invariance, whilst being non-local and explicitly construct such a theory. We construct the complete energy-momentum tensor and derive its components explicitly by assuming a specific projection operator. It is natural to next consider dark spinors in a cosmological setting. We find various interesting solutions where the spinor field leads to slow roll and fast roll de Sitter solutions. We also analyse models where the spinor is coupled conformally to gravity, and consider the perturbations and stability of the spinor.Comment: 43 pages. Several new sections and details added. JHEP in prin

Space-time evolution induced by spinor fields with canonical and non-canonical kinetic terms

We study spinor field theories as an origin to induce space-time evolution. Self-interacting spinor fields with canonical and non-canonical kinetic terms are considered in a Friedman-Robertson-Walker universe. The deceleration parameter is calculated by solving the equation of motion and the Friedman equation, simultaneously. It is shown that the spinor fields can accelerate and decelerate the universe expansion. To construct realistic models we discuss the contributions from the dynamical symmetry breaking.Comment: 16 pages, 19 figure

The RhoA transcriptional program in pre-T cells

The GTPase RhoA is essential for the development of pre-T cells in the thymus. To investigate the mechanisms used by RhoA to control thymocyte development we have used Affymetrix gene profiling to identify RhoA regulated genes in T cell progenitors. The data show that RhoA plays a specific and essential role in pre-T cells because it is required for the expression of transcription factors of the Egr-1 and AP-1 families that have critical functions in thymocyte development. Loss of RhoA function in T cell progenitors causes a developmental block that pheno-copies the consequence of losing pre-TCR expression in Recombinase gene 2 (Rag2) null mice. Transcriptional profiling reveals both common and unique gene targets for RhoA and the pre-TCR indicating that RhoA participates in the pre-TCR induced transcriptional program but also mediates pre-TCR independent gene transcription

Introduction: The City Always Wins

This book brings the insights of social geographers and cultural historians into a critical dialogue with literary narratives of urban culture and theories of literary cultural production

Planned Violence: Post/Colonial Urban Infrastructure, Literature, and Culture

In this Introduction, the collection’s editors offer critical readings of Omar Robert Hamilton’s debut novel, The City Always Wins (2017), alongside a number of other literary texts, to open up and explicate the book’s orienting concept of ‘Planned Violence’. It situates the book in recent interdisciplinary work on infrastructures as both physical and aesthetic objects, and in commentaries on the relationship between the spatial layouts of post/colonial cities and the different kinds of violence to which they give rise. Throughout it further emphasizes the resistant quality of literary and cultural production as a way to diagnose and counter the planned violence of urban infrastructures in the post/colonial city, which is one of the collection’s overarching efforts. It concludes with a summary overview of the book’s three sections, highlighting the relationships between the chapters and creative interludes that follow