Piercing of domain walls: new mechanism of gravitational radiation

Domain wall (DW) moving in media undergoes the friction force due to particle scattering. However certain particles are not scattered, but perforate the wall. As a result, the wall gets excited in the form of the branon wave, while the particle experiences an acceleration jump. This gives rise to generation of gravitational waves which we call "piercing gravitational radiation" (PGR). Though this effect is of higher order in the gravitational constant than the quadrupole radiation from the collapsing DWs, its amplitude is enhanced in the case of relativistic particles or photons because of absence of the velocity factor which is present in the quadrupole formula. We derive the spectral-angular distribution of PGR within the simplified model of the weakly gravitating particle-wall system in Minkowski space-time of arbitrary dimensions. Within this model the radiation amplitude is obtained analytically. The spectral-angular distribution of PGR in such an approach suffers from infrared and ultraviolet divergences as well as from collinear divergence in the case of a massless perforating particle. Different cut-off schemes appropriate in various dimensions are discussed. Our results are applicable both to cosmological DWs and to the braneworld models.Comment: 30 pages, 8 figure

“Let me be your stimy toy”: fashioning disability, cripping fashion

This chapter considers how previously marginalised corporealities get incorporated into the visual mainstream and asks how – and if – fashion can help to disrupt the canons of bodily normalcy. It sets out a theoretical framework for analysing images of disability by outlining the four dominant strategies for representing disabled and other non-normative bodies in visual culture: ‘enfreakment’ (Garland-Thomson 1998); ‘mainstreaming’, a strategy that invites the viewer to negate and disregard the bodily difference (Smith 2006); ‘disability aesthetics’ (Siebers 2010); and ‘crip aesthetics’. It then discusses recent representations of disabled bodies in fashion and lifestyle media that perform or challenge these strategies, focusing on images of amputee performer and model Viktoria Modesta, amputee war veteran and model Noah Galloway, model Melanie Gaydos as shot by photographer Tim Walker and the fashion performances organised by non-binary queer and disabled Filipinx artist and designer Sky Cubacub. I argue that the latter projects offer alternative and radical ways of representing disability within a fashion context and celebrate visible difference as a source of creative potential, rather than attempting to normalise or fetishise it, thus ‘cripping’ fashion

The prospects of developing catering services in Ukraine

Modern trends in restaurant business are largely intangible – this type of activity is rapidly developing and creates new unique features. Recently, the trend has begun to shift the services of organizing consumption of products and servicing consumers from catering halls to other places. One of the newest branches of restaurant industry is catering