Radio Emission by Particles due to Pulsar Spin

We present a relativistic model for the motion of charged particles in rotating magnetic field lines projected on to a plane perpendicular to the rotation axis. By making an approximation that the projected field lines are straight, an analytical expression is obtained for the particle trajectory. The motive behind developing this model is to elucidate some of the effects of rotation in pulsar profiles. There is a significant contribution to the curvature of particle trajectory due to the rotation of pulsar, which is in addition to the inherent curvature of the field lines. The asymmetry in the observed pulse shapes can be explained by considering the aberration-retardation effects. The single sign circular polarization that has been observed in many pulsars, might be due to the relative orientation of sight line with respect to the particle trajectory plane.Comment: 19 pages, 6 figues. Submitted to Astronomy and Astrophysic

Constructing Roma Migrants: European Narratives and Local Governance / The Stilled-Other of the Citizen : “Roma beggars” and Regimes of (Im)mobility in an Austrian City

The chapter looks into the socio-material production and regulation of the ethno-political figure of the “Roma beggar” through the prism of a regime-of-(im)mobility approach. Based on an ethnographic study, core aspects of this regime for “Roma beggars” are analysed on a micro-scale: criminalizing transport, invisibilising borders, educating beggars, victimization, stillness and deportability. The study investigates the everyday social and physical infrastructures and logistics for (im)mobility, imaginaries of (im)mobility and discursive technologies. It shows how a differentiated, rationalized knowledge on “them” is produced. “Roma beggars” are constituted as an epistemic object and policy target, legitimizing the unequal treatment of people in the name of security. The related regime-of-(im)mobility derives its effectiveness precisely from its in-built arbitrariness and inconsistency. The key insight is that the “stilled, able beggar” is the only legitimate form of begging in the light of a community of good and able citizens. As this figure is practically unrealizable and deceptive, it flips into the “Roma beggar”. The chapter concludes that this “stilled-Other of the citizen” is a discursively activatable and materially stabilized aspect of the Otherness operating within the concept of citizenship itself. Hence, the regime-of-(im)mobility for “Roma beggars” turns out to be an integral part of regimes that enable differential movements and forms of (im)mobile existences among all kinds of people.(VLID)340631