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Empiricism and Realism Reconciled in Agazzi’s Conception of Scientific Objectivity

Niccolò Covoni, Gino Tarozzi

Published Oct 21, 2024• 0 citations
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Abstract

Evandro Agazzi has shown the possibility of a reconciliation between logical empiricism and realism through the proposal of his conception of scientific objectivity, which replaces the notion of entity with that of object, conceived as a structured set of properties. This conception, on the one hand, has been developed from a more empiricist perspective, according to which the reality of the object is shifted to one of its predictable properties, and on the other hand, has produced his fruitful criticism of the orthodox interpretation of quantum mechanics and his demand for a realist interpretation based on the introduction of new non-classical concepts.

DOI
10.56550/d.3.1.2

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Evandro Agazzi has shown the possibility of a reconciliation between logical empiricism and realism through the proposal of his conception of scientific objectivity, which replaces the notion of entity with that of object, conceived as a structured set of properties. This conception, on the one hand, has been developed from a more empiricist perspective, according to which the reality of the object is shifted to one of its predictable properties, and on the other hand, has produced his fruitful criticism of the orthodox interpretation of quantum mechanics and his demand for a realist interpretation based on the introduction of new non-classical concepts.
Evandro AGAZZI: Introduction. Part One: PHILOSOPHICAL CONSIDERATIONS. Paul HORWICH: Realism and Truth. Evandro AGAZZI: On the Criteria for Establishing the Ontological Status of Different Entities. Aristides BALTAS Con-straints and Resistance: Stating a Case for Negative Realism. Michel PATY: Predicate of Existence and Predictability for a Theoretical Object in Physics. Part Two: OBSERVABILITY AND HIDDEN ENTITIES. Francois BONSACK: Atoms: Lessons of a History. Alberto CORDERO: Arguing for Realities. Bernard d'ESPAGNAT: On the Difficulties that Attributing Existence to Hidden Quantities May Rise. Massimo PAURI: The Quantum, Space-Time and Observation. Part Three: APPLICATIONS TO QUANTUM PHYSICS. David ALBERT: On the Phenomenology of Quantum-Mechanical Superpositions. Gian Carlo GHIRARDI: Realism and Quantum Mechanics. Michel CROZON: Experimental Evidence of Quark Structure Inside Hadrons.
Two conceptions of the contemporary philosophy of science are taken under consideration: scientific realism and constructive empiricism. Scientific realism presupposes 1) the conception of truth as the correspondence of knowledge to reality, 2) the real existence of entities postulated by a theory. The constructive empiricism puts forward the idea of empirical adequacy: science aims to give us the theories which are empirically adequate and acceptance of the theory involves as belief only that it is empirically adequate. To compare methodological resources of these two positions in the philosophy of science the problem of the interpretation of quantum mechanics is involved. As a methodological realization of scientific realism the ensemble interpretation of quantum mechanics is taken under consideration. K.Popper’s version
Structural realism attempts to make a compromise between scientific realism and empiricism, by restricting our realist commitment to the relational structure of scientific theories. There are two main versions of the position: ontic, or epistemic. According to ontic structural realism, the nomological relations expressed by theories are the primitive entities of reality. This ontic version is motivated in particular by arguments to the effect that epistemic versions are not really distinct from mere empiricism. However according to some authors, it’s not clear that ontic structural realism can differentiate between physical and mathematical relations, and account for the relations between scientific theories and their experimental basis. These difficulties can be related to the measurement problem in quantum mechanics, which also concerns the link between theoretical models and experiments. It appears that epistemic structural realism is in a better position to respond to these difficulties. A compromise between both versions of structural realism could allow us to keep the advantages of both.
According to scientific realism, science gives us an approximately true description of what the world is like. But what does it mean? In this chapter, we focus on the ontological and metaphysical aspects of this discussion. That is, we are concerned with the following questions: what there is, according to our best scientific theories? And how are these things that theories say exist? We start from the assumption that a genuine scientific realism must deal with these issues. Taking non-relativistic quantum mechanics as a case study, we discuss some of the challenges currently faced by a genuinely realistic stance. We argue, first, that in the ontological aspect, realists are in the same boat as science, that is, without sufficient epistemic justification to adopt the belief in the entities postulated by a single quantum theory, given that experience (currently) is not able to decide between rival theories; in the metaphysical aspect, realists also encounter problems with theory choice, given the possibility of associating more than one metaphysical theory with the description of the entities postulated by each quantum theory. The same goes for structuralist alternatives, since, even if we accept that scientific theories are committed to the existence of structures, but not objects, we still do not know what structures are, metaphysically. Finally, we move forward in the discussion with the meta-Popperian method, which serves to reduce the metaphysical alternatives associated with the ontological postulates of scientific theories. We may not know what the correct alternative is, but we have been able to progressively check which metaphysical alternatives are incompatible with each scientific theory.
The interpretation of quantum mechanics remains one of the most challenging problems in the philosophy of science, particularly regarding the relationship between scientific theories and reality. In this section we compare two significant conceptual frameworks that address these challenges: RWR interpretation and the Bild conception of scientific theory structuring. Both approaches offer sophisticated alternatives to traditional realist interpretations while maintaining scientific rigor and explanatory power.
Quantum mechanics has sometimes been taken to be an empiricist (vs. realist) theory. I state the empiricist's argument, then outline a recently noticed type of measurement—protective measurement—that affords a good reply for the realist. This paper is a reply to scientific empiricism (about quantum mechanics), but is neither a refutation of that position, nor an argument in favor of scientific realism. Rather, my aim is to place realism and empiricism on an even score in regards to quantum theory.