This paper reconsiders what implications quantum decoherence has for Karen Barad’s agential realism. In contrast with the recent claim of Thomas Everth and Laura Gurney (2022), this paper argues that decoherence supports rather than defeats the holist, relational ontology of agential realism. Indeed, decoherence offers an explanation for how a quantum system can remain entangled and superposed in principle while it nevertheless in practice appears classical to a local observer. Decoherence shows why the appearance of classicality is not an objection (...) to the ontology being in reality that of agential realism, in accordance with Barad’s repeated insistence that we should not mistake principle for practice. Whether users of agential realism in social theory should be encouraged by this is another matter that this paper does not take a stance on. As an ontology, however, agential realism is vindicated. (shrink)

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One of the most influential contemporary authors of the new materialist turn in the social sciences is Karen Barad. Barad’s work in agential realism, based on her interpretations of quantum physics, has been widely cited within a growing body of new materialist publications. However, in translating Barad’s assertions into social domains, there has been increasing critical appraisal of the physics underlying her work and its relationship with non-quantum domains. In this paper, we contribute to this discussion by exploring aspects of (...) agential realism through quantum decoherence and quantum Darwinism. We explore implications for Barad’s metaphysics and the relationship of the social with the rest of the material world. (shrink)

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Over the last twenty years, archaeologists have used various process-oriented modes of enquiry to undermine the belief that humans are special. Barad (2007) developed Bohr’s indeterminist interpretation of quantum mechanics into agential realism which offers an ontological basis for distributing agency away from humans and plays a crucial role in underwriting some posthumanist archaeological agendas. But its origins in quantum physics make agential realism difficult to understand and evaluate. Despite the challenge, the first two parts of this paper are devoted (...) to each task in turn, with limited success. Part three turns to the archaeological literature, where the evaluation of agential realism turns out to be even more inadequate and so I advise against its use in support of process-oriented approaches in archaeology. The final section turns to the activity of an art workshop and introduces a playful approach to working with clay. Clayful phenomenology is a way of investigating the relationship between gesture, material and ideation. During sculpting, phenomenological experience is not subjective, stable and external but is generated within a transient creative system where entities, ideas and agency reciprocally, emerge as ephemeral manifestations. Clayful phenomenology and agential realism are ontologically similar and both are controversial but agential realism has a wall of quantum conceptual complexity standing between it and a judgement about credibility whereas playing with clay can be assessed directly, through experience. (shrink)

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Quantum mechanics supersedes classical mechanics, and social science, some argue, should be responsive to this change. This paper finds that two rather different arguments are currently being used to argue that quantum mechanics is epistemically relevant in social science. One, attributed to Alexander Wendt, appeals to the presence of quantum physical effects in the social world. The other, attributed to Karen Barad, insists on the importance of quantum metaphysics even when quantum effects are negligible. Neither argument, however, is sound. Consequently, (...) the paper concludes that neither of them offers compelling arguments for the view that quantum mechanics has epistemic relevance for social science. (shrink)

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An extraordinary, if circumscribed, positive shift has occurred since the mid-twentieth century in the perceived status of Hugh Everett III's 1956 theory of the universal wave function of quantum mechanics, now widely called the Many-Worlds Interpretation (MWI). Everett's starkly new interpretation denied the existence of a separate classical realm, contending that the experimental data can be seen as presenting a state vector for the whole universe. Since there is no state vector collapse, reality as a whole is strictly deterministic. Explained (...) jointly by the dynamical variables and the state vector, “this reality is not the reality we customarily think of, but is a reality composed of many worlds,” wrote Everett's colleague Bryce DeWitt. In this essay, I account briefly for the change of status in conventional scientific terms, yet chiefly in extended terms of three sets of ideas that I argue can be understood to affect believability in both scientific and religious contexts, illuminating helpfully the MWI phenomenon, and its engagement with theology: orthodoxy and heresy, language and reference, and faith and agnosticism. One's orientation relative to the variable content of these dynamic, socially oriented categories helps to make belief in ideas as metaphysically challenging as Everettian Quantum Mechanics, or particular ideas about God, either more or less believable. The categories will have the same function in a theology engaging Everett's theory, and in any theology at all written in a society deeply marked by what I further argue is a subtle, powerful, and pervasive mode of quasi-scientific thinking we can call societal constructive agnosticism, of which anyone doing theology today must be aware. (shrink)

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