This paper argues that existence claims for theoretical entities must be based on more than their role in one theory. The supplementary evidence should be either observation, whether direct or indirect, or the possibility of detaching the existence claim from one particular theory. A logical schematism for the latter type of support is developed.

This article clarifies Bohr's position by focusing on the work he did in nuclear physics and scattering theory.

In the course of his long development, Kant's concept of matter changed somewhat, while his concept of scientific explanation changed considerably. Both developments achieved a coherent integration in Kant's Metaphysical Foundations of Natural Science. Using this developmental background, the present paper argues that the Foundations should be interpreted as an attempted rational reconstruction of the mechanics of Newton and Euler. Kant attempted to do this by constructing a concept of matter that would confer a Leibnizian intelligibility on Newtonian mechanics, and (...) also accord with Kant's theories on the nature of concepts and their role in scientific explanation. (shrink)

Rom Harré's proposed Copernican Revolution in the philosophy of science is a very ambitious undertaking. It challenges established views, proposes a radically new model for scientific explanation, and forces a rethinking of the foundations of the field. In his treatment of the natural sciences, Harré rejects all deductivist accounts of scientific explanation basically on the grounds that such accounts seriously distort the methods of explanation actually operative in science. In the social sciences Harré, in collaboration with Secord, rejects mechanistic, positivistic, (...) and behavioristic accounts of human behavior [5]. In place of these discarded interpretations he substitutes a new realism which stresses the role that models play in supplying accounts of observed patterns of phenomena in terms of the things and processes whose interactions are responsible for the manifest phenomena. This revolution, if successfully carried out, would indeed be a valuable contribution to the philosophy of science. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:John Edward MacKinnon BORIS PASTERNAK'S CONCEPTION OF REALISM To desire truth is to desire direct contact with a piece of reality. To desire contact with a piece of reality is to love. —Simone Weil, The Needfor Roots According to czeslaw milosz, Boris Pasternak "did not pluck fruits from the tree of reason, the tree of life was enough for him. Confronted by argument, he replied with his (...) sacred dance." Pasternak's poetry, he concludes, is "antispeculative, anti-intellectual," and though he was compelled to make certain concessions in the course of writing Doctor Zhivago, speculative thought nonetheless remained for him a perennial and decided "adversary." ' However, the familiar and conveniently stark distinction between lyricist and thinker upon which such judgments depend is in fact both naive and tiresome since, plainly, creativity and reflection need in no way necessarily subvert one another. Accordingly, while it is indeed likely that the most valued feature of Pasternak's poetry and best prose is its detailed recording ofthe world's incessant change, of the magic and movement of weather and gardens, seasons and landscapes, Milosz is far from just in so readily and categorically dismissing any attribution of poetic thought to Pasternak. For as much as the whole of his poetry amounts to a celebration of life's small wonders, unrivaled in their greatness, there remains at bottom the inspiration of the thinker, of one who has seen and felt, but who at the same time has had to compile and consider in an attempt to make sense of the whole. As if in open challenge to Milosz, CM. Bowra notes that Pasternak's poetic sensibility is "both physical and intellectual." The mental states described in his poems, Bowra writes, "begin with sensations of the eye and ear but contain something else in their mental appreciation of the 211 212Philosophy and Literature situation," namely, his "gift for grasping abstract problems." 2 If Milosz remains unconvinced, and if Wladimir Weidle dismisses Pasternak's poetic thought as "puny and piteous," still more poets and critics have shared Bowra's view.3 Henry Gifford refers to Pasternak's "philosophical habit of mind," Ronald Hingley to the "pyrotechnics" ofhis "darting intellect," and Yury Lotman to his personal and "thoroughly professional philosophical culture." 4 In her review ofPasternak's My Sister, Life, meanwhile, Marina Tsvetaeva observes that "thought is what works in him, burrows in subterranean passages...." 5 And though Nadezhda Mandelstamclaims that the word of all poets "flows from a general, integrated view of the world," she acknowledges too that poets "vary in the range and depth of their understanding" and proceeds to cite Pasternak as her one example of a poet with a particularly unified worldview.6 If we were to agree with Francis Sparshott that "the fiercest hatreds spring from the closest relationships," we could assume in turn that the fundamental antagonism customarily alleged to obtain between the creative and critical faculties in fact indicates only some common, if confused, origin or inspiration.7 In creating, after all, it is predictable rather than idiosyncratic that the artist will be led to investigate the roots ofart within himself, tiiat he will be tempted by the urge to define, to entertain, that is, some rudimentary theory. And indeed, in Pasternak 's case, it is not simply a matter of his poetry and prose having been informed by certain tacit, if stray, aesthetic conceptions, but rather of his having supplemented his intensely thoughtful artwith aconcurrently developed theory. In this article, I want specifically to consider Pasternak's conception of realism, that standard of achievement which, according to his theory, constitutes the touchstone of all great art. In order more firmly to ground this notoriously vague and unwieldy notion, I will appeal not only to complementary theoretical conceptions of Pasternak's, but also to those central ideas advanced by Iris Murdoch in The Sovereignty of Good. My intention will be to locate Pasternak's brand of realism within what I take to be an identifiable tradition, or at least a conspicuous and pervasive theoretical tendency, according to which the most crucial criterion of artistic realism is judged to be not any properly physical aspect ofthe completed work, and certainly... (shrink)

There are two opposing traditions in contemporary quantum field theory (QFT). Mainstream Lagrangian QFT led to and supports the standard model of particle interactions. Algebraic QFT seeks to provide a rigorous consistent mathematical foundation for field theory, but cannot accommodate the local gauge interactions of the standard model. Interested philosophers face a choice. They can accept algebraic QFT on the grounds of mathematical consistency and general accord with the semantic conception of theory interpretation. This suggests a rejection of particle ontology. (...) Or they can accept the standard model on the grounds of its established success. This alternative, which I defend, suggests revising philosophical accounts of scientific theory and finding some way of accommodating particles. (shrink)

In place of earlier instrumentalist and phenomenalist interpretations of science both Quine and Sellars have developed highly influential realist positions centering around the doctrine that accepting a theory as explanatory and irreducible rationally entails accepting the entities posited by the theory. A growing reaction against this realism is partially based on perceived inadequacies in the doctrines of Quine and Sellars, but even more on reconstructions of scientific explanations which do not involve such ontic commitments. Three types of anti-realistic positions are (...) considered and criticized. Hesse's neo-Duhemian position couples a statistical theory of inference to a downgrading of purely theoretical statements. Sneed uses the method of axiomatrization through set-theoretic predicates to supply a reconstruction of Kuhn's account of scientific development. Here Ramsey-reduction sentences serve to eliminate purely theoretical terms. The longest section deals with van Fraassen's semantic model based on a state-space representation of scientific theories and the use of this model in interpreting quantum mechanics. It is argued that the model is valuable, but that the anti-realist interpretation accorded it is not justified and entails serious inconsistencies. (shrink)

This book is the first to offer a systematic account of the role of language in the development and interpretation of physics. An historical-conceptual analysis of the co-evolution of physics and mathematics leads to the classical/quantum interface. Bohr's interpretation is analyzed and extended to the interpretation of the standard model of particle physics.

Aristotele. Science as a systematic explanation through causes.--Newton, I. Rules and reflections on scientific reasoning.--Carnap, R. Empiricism, semantics, and ontology.--Hempel, C. On the logic of explanation.--Nagel, E. The realist view of theories.--Quine, W. V. On the role of logic in explanation.--Harris, E. E. Method and explanation in metaphysics.--Einstein, A. Remarks on Bertrand Russell's theory of knowledge.--Sellars, W. The language of theories.--MacKinnon, E. Atomic physics and reality.--Bunge, M. Physics and reality.--Heelan, P. A. Quantum mechanics and objectivity.--Bibliographical essay (p. 285-301).

An epistemological interpretation of quantum mechanics hinges on the claim that the distinctive features of quantum mechanics can be derived from some distinctive features of an observational basis. Old and new variations of this theme are listed. The program has a limited success in non-relativistic quantum mechanics. The crucial issue is how far it can be extended to quantum field theory without introducing significant ontological postulates. A C*-formulation covers algebraic quantum field theory, but not the standard model. Julian Schwinger’s anabatic (...) methodology extended a strict measurement-based formulation of quantum mechanics through field theory. His extension also excluded the quark hypothesis and the standard model. Quarks and local gauge invariance are postulates that go beyond the limits of an epistemological interpretation of quantum mechanics. The ontological significance ascribed to these advances depends on the role accorded ontology. (shrink)

This article probes the question of what interpretations of quantum mechanics actually accomplish. In other domains, which are briefly considered, interpretations serve to make alien systematizations intelligible to us. This often involves clarifying the status of their implicit ontology. A survey of interpretations of non-relativistic quantum mechanics supports the evaluation that these interpretations make a contribution to philosophy, but not to physics. Interpretations of quantum field theory are polarized by the divergence between the Lagrangian field theory that led to the (...) Standard Model of Particle physics and the Algebraic quantum field theory, that discounts an ontology of particles. Ruetsche's interpretation, it is argued, offers a potential for loosening the sharp polarization that presently obtains. A brief evaluation focuses on the functional ontology of quantum field theory considered as an effective theory. (shrink)

The consistent histories reformulation of quantum mechanics was developed by Robert Griffiths, given a formal logical systematization by Roland Omn\`{e}s, and under the label `decoherent histories', was independently developed by Murray Gell-Mann and James Hartle and extended to quantum cosmology. Criticisms of CH involve issues of meaning, truth, objectivity, and coherence, a mixture of philosophy and physics. We will briefly consider the original formulation of CH and some basic objections. The reply to these objections, like the objections themselves, involves a (...) mixture of physics and philosophy. These replies support an evaluation of the CH formulation as a replacement for the measurement, or orthodox, interpretation. (shrink)

Niels Bohr began his career with an attempt to give a correct descriptive account of the motion of electrons. When forced to abandon this interpretation, he adopted, but soon rejected, a hypothetical-deductive account. In his development of an interpretation for the new quantum theory Bohr began to concentrate on the way language functions to make descriptions possible. His later work on this problem and on the role of concepts in the foundations of science led him to anticipate some of the (...) basic ideas developed in Wittgenstein's Investigations. Bohr eventually saw his own analysis of the conditions of the possibility of unambiguous communication as the basis for making explicit the unity implicit in science. (shrink)

The tension that many early scientists experienced between a reliance on religious tradition as a source of truth and scientific methodology as a guide to truth eventually led to a clash between theists who claimed that the existence of the universe required a creator and non-theists, who insisted that recourse to a creator to explain why there is something perverts scientific methodology. The present paper defends the position that physics and its foreseeable cosmological extensions neither requires nor excludes either opposed (...) contention. Each has the status of an inference to the best explanation. This is developed in three stages. The first uses historical analysis to support the claim that the advancement of physics and cosmology do not rely on an appeal to supernatural forces. The second explains inference to the best explanation. The third shows how this accommodates these conflicting claims. An appendix examines an influential argument that the intelligibility of the universe requires a creator. (shrink)

The idea that science aspires to and routinely achieves truths about the world has been challenged in recent writings. Rather than beginning with a theory of scientific development, or of scientific explanation, we begin with a consideration of truth claims in ordinary discourse, particularly with Davidson's truth-functional semantics. Next we consider the way in which some framework features of ordinary language discourse are extended to and modified in scientific discourse. Two areas are treated in more detail: quantum theory, and the (...) peculiar problem of semantic entailment it involves; and quantum field theory. These supply a basis for criticizing some historicist and logicist treatments of the truth of scientific claims. (shrink)

This article completes the study begun in I by a detailed consideration of errol harris's, "the foundations of metaphysics in science" and by an independent interpretation of the epistemological foundations of scientific theories. This is done in terms of two components labelled 'a physical language' and 'a mathematical language'. A physical language is conceived as a transformed extension of ordinary language which preserves its basic structural principles while modifying its descriptive metaphysics. The relation between such a physical language and a (...) mathematical system is explained by a correspondence between second order physical predicates and first order mathematical predicates. (shrink)

The revolt against logical positivism within the philosophy of science has now lasted long enough to produce something of a counter-revolution. As the more strident charges (positivistic analyses misrepresent the most fundamental features of the scientific enterprise and have contributed little or nothing to its clarification) and counter-charges (any attempt to induce a philosophy of science from studies in the history of science rests on a massive genetic fallacy) gradually subside, critical interest is focussing on the presuppositions that guide and (...) structure various interpretations of science. Here epistemological positions, often implicitly assumed, play a pivotal role. In the present article we shall try to make different positions and presuppositions explicit by examining some current developments in the philosophy of science. This examination will be focused on, though not limited to, three recent books by I. Schefller, S. Körner, and E. Harris. (shrink)

Philosophical interpretations of theories generally presuppose that a theory can be presented as a consistent mathematical formulation that is interpreted through models. Algebraic quantum field theory (AQFT) can fit this interpretative model. However, standard Lagrangian quantum field theory (LQFT), as well as quantum electrodynamics and nuclear physics, resists recasting along such formal lines. The difference has a distinct bearing on ontological issues. AQFT does not treat particle interactions or the standard model. This paper develops a framework and methodology for interpreting (...) such informal theories as LQFT and the standard model. We begin by summarizing two minimal epistemological interpretation of non-relativistic quantum mechanics (NRQM): Bohrian semantics, which focuses on communicables; and quantum information theory, which focuses on the algebra of local observables. Schwinger's development of quantum field theory supplies a unique path from NRQM to QFT, where each step is conceptually anchored in local measurements. LQFT and the standard model rely on postulates that go beyond the limits set by AQFT and Schwinger's anabatic methodology. The particle ontology of the standard model is clarified by regarding the standard model as an informal modular theory with a limited range of validity. (shrink)

This is a long critical evaluation of W. Sellars's book.

One of the key interpretative problems generated by the development of quantum theory was the conceptual consistency underlying scientific change, a problem not adequately treated by any of the leading theories of scientific development. In different but related ways Quine, Sellars, and Davidson have treated the problem of conceptual consistency by showing how one can begin with ordinary language and proceed to specialized extensions. Their techniques have not been applied to modern physics. However, one basis for applying them arises from (...) the deep similarities between some of the work of these analysts and the Copenhagen interpretation rightly interpreted. To make this more concrete three concepts whose meanings have changed as a result of scientific progress are considered: 'atom', 'state of a system', and 'particle'. Each functions in a different way and requires a different type of analysis. (shrink)

This is an attempt, which I subsequently abandoned, to relate Thomistic metaphysics to modern physics.

ABSTRACT. The objectivity of physics has been called into question by social theorists, Kuhnian relativists, and by anomalous aspects of quantum mechanics. Here we focus on one neglected background issue, the categorical structure of the language of classical physics. The first half is an historical overview of the formation of the language of classical physics, beginning with Aristotle's Categories and the novel idea of the quantity of a quality introduced by medieval Aristotelians. Descartes and Newton at-tempted to put the new (...) mechanics on an ontological foundation of atomism. Euler was the pivotal figure in basing mechanics on a macroscopic concept of matter. The second scientific revolution, led by Laplace, took mechanics as foundational and attempted to fit the Baconian sciences into a framework of atomistic mechanism. This protracted effort had the unintended effect of supplying an informal unification of physics in a mixture of ordinary language and mechanistic terms. The second half treats LCP as a linguistic para-site that can attach itself to any language and effect mutations in the host without chang-ing its essential form. This puts LCP in the context of a language of discourse and sug-gests that philosophers should concentrate more on the dialog between experimenters and theoreticians and less on analyses of theories. This orientation supplies a basis for treating objectivity. (shrink)