Browsing by Subject "interaction"

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    A study of relativistic fluids with applications to cosmology: A variational approach
    (2021) Oreta, Timothy; Osano, Bob
    This thesis examines relativistic fluids. We have used the variational approach to develop tools for studying the dynamics of relativistic fluids to apply this to cosmological modelling. Studies like these go beyond the standard model in cosmology. Researchers believe that such extensions to the standard cosmological model are pivotal to resolving some of the long-standing cosmological problems. An example of such problems is the origin, growth (from quantum electromagnetic fluctuations to large-scale magnetic fields during inflation) and evolution of cosmological magnetic fields that exhibit as large-scale (cosmological) magnetic fields in late time. One other example is the coincidence problem. The standard approach in such studies is to use modelling in the form of the single-fluid formalism. As an alternative one can consider the single-fluid and multi-fluid formalisms that incorporate aspects of electrodynamics and thermodynamics, respectively in the context of the variational approach. This might help us make progress in trying to either resolve some of these problems or at least open up new ways of addressing them. In this regard, we have extended the well-known M¨ueller-Israel-Stewart (hereafter MIS) formalism to allow us to examine the effect on fluid flow in which the components of the multi-species fluids interact thermodynamically. We use the extension to the MIS theory in the context of interacting species to study the growth of dark matter and dark energy, and find that either interaction or entrainment involving dark energy and dark matter suggests a mutual relative modulation of the growth behaviour of the two densities. This may aid in resolving the coincidence problem. Our examination of inflation-generated, large-scale magnetic fields reveals a super-adiabatically evolving mode from the beginning of the radiation-dominated epoch to either much later during the epoch or probably extending far into the era of matter domination which may account for late time, large-scale magnetic fields.
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    Performativity and gameplay: gender, race, and desire amongst a team of League of Legends players
    (2020) Whitfield, Kirsten/Waker; Deumert, Andrea
    Computer gaming is an important and growing form of popular media that has many cognitive and social benefits for players. It has also developed a reputation for being a white-male pastime and barring access for people who fall outside of that social grouping. While statistics show that this is increasingly not the case, certain games, particularly those that fall under the category of eSports, do attract largely male player bases. League of Legends is one such game. With Butler's Performativity Theory as a theoretical starting point, a qualitative sociolinguistic study was undertaken into the gendered dynamics of a male-dominated clan of League of Legends players. The data, collected primarily via audio-recordings of player interactions between games, is used as the basis for a sociolinguistic case study that looks at how performativity plays itself out in an environment that is characterised by a strong gender bias. With a focus on a Coloured female gamer in a League of Legends team, this paper explores the ways in which she and her teammates construct their own genders within this particular sociolinguistic context. The relationship between identity and desire, which has been a point of debate in sociolinguistics, is discussed in the context of the clan's interactions. Here I focus on the debate between Cameron and Kulick on the one hand and Bucholtz and Hall on the other. The paper looks into ways in which desire and identity interact with each other during sociolinguistic interaction. Moreover, issues around the construction of gender, race and sexuality are central to the study. The paper uses the data collected to look into the ways that social identities are collaboratively constructed, and contested. The discussion shows that while the team members replicate the gender binary, they do so by simultaneously reifying and challenging gendered norms. The study provides a compelling look into the ways in which gender identities are played with in interaction, and sheds some light on the fluidity of performative identity while simultaneously sketching out the ways that such performance is limited by its environment.