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Barad, Bohr, and quantum mechanics

Jan Faye, Rasmus Jaksland

Published Apr 18, 2021• 41 citations

Abstract

Abstract The last decade has seen an increasing number of references to quantum mechanics in the humanities and social sciences. This development has in particular been driven by Karen Barad’s agential realism: a theoretical framework that, based on Niels Bohr’s interpretation of quantum mechanics, aims to inform social theorizing. In dealing with notions such as agency, power, and embodiment as well as the relation between the material and the discursive level, the influence of agential realism in fields such as feminist science studies and posthumanism has been profound. However, no one has hitherto paused to assess agential realism’s proclaimed quantum mechanical origin including its relation to the writings of Niels Bohr. This is the task taken up here. We find that many of the implications that agential realism allegedly derives from a Bohrian interpretation of quantum mechanics dissent from Bohr’s own views and are in conflict with those of other interpretations of quantum mechanics. Agential realism is at best consistent with quantum mechanics and consequently, it does not capture what quantum mechanics in any strict sense implies for social science or any other domain of inquiry. Agential realism may be interesting and thought provoking from the perspective of social theorizing, but it is neither sanctioned by quantum mechanics nor by Bohr’s authority. This conclusion not only holds for agential realism in particular, it also serves as a general warning against the other attempts to use quantum mechanics in social theorizing.

DOI: 10.1007/s11229-021-03160-1

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Abstract The last decade has seen an increasing number of references to quantum mechanics in the humanities and social sciences. This development has in particular been driven by Karen Barad’s agential realism: a theoretical framework that, based on Niels Bohr’s interpretation of quantum mechanics, aims to inform social theorizing. In dealing with notions such as agency, power, and embodiment as well as the relation between the material and the discursive level, the influence of agential realism in fields such as feminist science studies and posthumanism has been profound. However, no one has hitherto paused to assess agential realism’s proclaimed quantum mechanical origin including its relation to the writings of Niels Bohr. This is the task taken up here. We find that many of the implications that agential realism allegedly derives from a Bohrian interpretation of quantum mechanics dissent from Bohr’s own views and are in conflict with those of other interpretations of quantum mechanics. Agential realism is at best consistent with quantum mechanics and consequently, it does not capture what quantum mechanics in any strict sense implies for social science or any other domain of inquiry. Agential realism may be interesting and thought provoking from the perspective of social theorizing, but it is neither sanctioned by quantum mechanics nor by Bohr’s authority. This conclusion not only holds for agential realism in particular, it also serves as a general warning against the other attempts to use quantum mechanics in social theorizing.

In recent years, there has been a growing interest in the human and social sciences towards contemporary natural science. In this regard, we can talk about a kind of “natural sciences turn” in these fields of knowledge. It is not just a matter of an active use of terminological and ideological baggage from the arsenal of natural sciences, but we can even talk about direct borrowing of argumentation. American researcher Karen Barad is one of the leading figures of this movement. Barad connects her theoretical conception of agential realism directly with quantum mechanics in its interpretation proposed by Niels Bohr. The article compares some of the key concepts of the Bohr vision of quantum mechanics, such as phenomenon, agency of observation with the reading acquired by these concepts in Barad’s agential realism. On a comparative analysis of the interpretation of these concepts by Bohr and Barad a number of problematic points of the concept of agential realism are revealed.

The article deals with the approach to understanding science and technology as well as natural and cultural practices developed by the American philosopher Karen Barad in the concept of agential realism. The peculiarity of her approach consists in referring as a starting point to quantum mechanics in its interpretation, which was proposed by Niels Bohr. Barad proposes a reinterpretation of Bohr's propositions through revealing their ontological content. In this regard, the article addresses the epistemological and ontological problems that quantum physics has faced, such as the conditions for the possibility of an objective description of the world, the nature of measurement, and the relationship between language and the material world. Discussed is the shift that Barad argues is asserted in Bohr's philosophy-physics, which consists of quantum mechanics moving from the linguistic concepts in which the world of classical science was represented to what Barad calls material-discursive practices through which the world is articulated and explained. The possibilities of a different interpretation of Niels Bohr's philosophy-physics are considered.

K. Barad proposes "agential realism" as a unified approach to natural and social phenomena. The position is inspired by quantum mechanics and in particular the phenomenon of quantum entanglement. Barad also sees similarities between her approach, N. Bohr's view and C. Rovelli's relational quantum mechanics. In our view, agential realism is a kind of ontological correlationism, not a realism. The analogy with the Bohr and Rovelli approaches is only partial. Agential realism is a wrong interpretation of quantum mechanics. It is also unsuitable for social theorizing, for which taking into account the sensitivity of ontology to the context is fundamental. As an alternative, we propose a contextual quantum realism that rejects substantive dualisms (as does Barad), but at the same time accepts the categorical dualism of the real and the ideal. Our approach also allows one to better understand Bohr's position and to correct Rovelli's relational quantum mechanics.

In this paper it is argued that Barad's Agential Realism, an approach to quantum mechanics originating in the philosophy of Niels Bohr, can be the basis of a 'theory of everything' consistent with a proposal of Wheeler that observer-participancy is the foundation of everything. On the one hand, agential realism can be grounded in models of self-organisation such as the hypercycles of Eigen, while on the other agential realism, by virtue of the 'discursive practices' that constitute one aspect of the theory, implies the possibility of the generation of physical phenomena through acts of specification originating at a more fundamental level. Included in phenomena that may be generated by such a mechanism are the origin and evolution of life, and human capacities such as mathematical and musical intuition.

This essay offers a critical reading of Karen Barad’s and Heinrich Päs’ interpretations of quantum mechanics, using a Categorial Differentiation approach to science and religion, which is inspired by Wittgenstein and van Fraassen. Barad and Päs are ontological realists, but their philosophies of quantum mechanics depart from what I call scientistic realist interpretations of quantum mechanics, which are mainstream in the analytic philosophy of physics. After an overview of the ontological turn in the philosophy of quantum mechanics and explaining the basic difference between scientistic and existential kinds of realism, I examine the central features of Barad’s agential realism and Päs’ quantum monism. The Categorial Differentiation approach, which offers a normative perspective on the relationship between science and religion, is introduced, and its relevance for the philosophy (and theology) of quantum mechanics is explained. I conclude the essay with a critical analysis of Barad’s and Päs’ interpretations from this Wittgensteinian perspective, focusing on the ways in which they relate the science of quantum mechanics with their respective existential–moral visions.

The so-called “orthodox” interpretation of quantum physics attributed to Niels Bohr is commonly regarded as abandoning realism. I have already opposed this view elsewhere (Folse 1985) but partially in response to criticism of my position (Shimony 1985), here I propose to relate Bohr’s realism to recent contributions to the realism debate given by Hacking (1983), Cartwright (1983), and Ellis (1985). Specifically, I argue that Bohr’s complementarity viewpoint requires a causal entity realism. Furthermore, labeling Bohr an anti-realist with respect to theories is misleading because it assumes the correspondence theory of truth that Bohr holds quantum theory forces us to reject. Although there are many realist views, I take the root of realism to be the quest for knowledge about the reality producing the phenomena we experience. It is realism in this sense that Bohr defended and that makes science significant to metaphysics.