In the late 19th century great changes in theories of light and electricity were in direct conflict with certitude, the view that scientific knowledge is infallible. What is, then, the epistemic status of scientific theory? To resolve this issue Duhem and Poincaré proposed images of fallible knowledge, Instrumentalism and Conventionalism, respectively. Only in 1919–1922, after Einstein's relativity was published, he offered arguments to support Fallibilism, the view that certainty cannot be achieved in science. Though Einstein did not consider Duhem's Instrumentalism, (...) he argued against Poincaré's Conventionalism. Hitherto, Einstein's Fallibilism, as presented at first in a rarely known essay of 1919, was left in the dark. Recently, Howard obscured its meaning. Einstein's essay was never translated into English. In my paper I provide its translation and attempt to shed light on Einstein's view and its context; I also direct attention to Einstein's images of philosophical opportunism in scientific practice. (shrink)

This article examines in detail a remarkable but short-lived cosmological theory of 1959. The theory depended crucially on a hypothesis that could be, and was, tested in the laboratory. I use the case to discuss the nature of testing in cosmology and to argue against ideas about astronomy suggested by Ian Hacking. The case of the electrical universe exemplifies how disagreements can be settled by good experiments and also how experiments of wide-ranging theoretical significance need not be biased by either (...) theory or the experimentalists’ predisposed ideas. I argue that the episode supports Allan Franklins “evidence model” and disputes accounts based on the sociology of scientific knowledge. (shrink)

The eminent mathematical physicist Sir Hermann Bondi once said: “There is no more to science than its method, and there is no more to its method than Popper has said.” Indeed, many regard Sir Karl Raimund Popper the greatest philosopher of science in our generation. Much of what Popper “has said” refers to physics, but physicists, generally speaking, have little knowledge of what he has said. True, Popper's philosophy of science and, in particular, his realistic interpretation of quantum mechanics deviates (...) considerably from the generally accepted doctrine. But as Popper, rightly I think, points out, it is precisely the proliferation of divergent theories which promotes the growth of scientific knowledge; it would be a danger for physics if physicists were dogmatically tied to a single theory or would not test their theory against alternatives. It is for this purpose that, on the occasion of the nonagenarian celebration of Popper's birthday, the present essay has been written. (shrink)

One of the more important cosmological consequences of Einstein's general theory of relativity is the hypothesis that our universe may either expand or contract with time. Relativistic cosmogony is concerned with those phases of this process which belong to the past. We begin with a digest of cosmogonic developments.

Einstein's early thoughts about superconductivity are discussed as a case study of how theoretical physics reacts to experimental findings that are incompatible with established theoretical notions. One such notion that is discussed is the model of electric conductivity implied by Drude's electron theory of metals, and the derivation of the Wiedemann-Franz law within this framework. After summarizing the experimental knowledge on superconductivity around 1920, the topic is then discussed both on a phenomenological level in terms of implications of Maxwell's equations (...) for the case of infinite conductivity, and on a microscopic level in terms of suggested models for superconductive charge transport. Analyzing Einstein's manuscripts and correspondence as well as his own 1922 paper on the subject, it is shown that Einstein had a sustained interest in superconductivity and was well informed about the phenomenon. It is argued that his appointment as special professor in Leiden in 1920 was motivated to a considerable extent by his perception as a leading theoretician of quantum theory and condensed matter physics and the hope that he would contribute to the theoretical direction of the experiments done at Kamerlingh Onnes' cryogenic laboratory. Einstein tried to live up to these expectations by proposing at least three experiments on the phenomenon, one of which was carried out twice in Leiden. Compared to other theoretical proposals at the time, the prominent role of quantum concepts was characteristic of Einstein's understanding of the phenomenon. The paper concludes with comments on Einstein's epistemological reflections on the problem. (shrink)

Philosophical considerations have been essentially involved in the origin and development of the steady-state cosmological theory. These considerations include an explicit uniformitarian methodology and implicit metaphysical views concerning the status of natural laws in a changing universe. I shall examine the foundations of SST by reconstructing its early history. Whereas the strong uniformitarian methodology of SST found no support in the subsequent development of cosmology, the idea of a possible influence the global structure of the universe may have on the (...) laws of physics operative in it has been assimilated by the standard big bang theory as it made its remarkable progress in recent decades. (shrink)

The various cosmological proposals by Einsteinian relativists seek to show the structure of the world as a consequence of the basic notions of relativity. In particular, the irrelevance of the state of motion of an observer to his description of the fundamental laws of nature is to be maintained. Furthermore, gravity is understood as being a description of the fact that particles move along certain minimal paths in non-Euclidean space. In this theory, the effect of one material particle on another (...) particle in the old-fashioned sense of gravitational attraction becomes indirect; that is, a particle moves on a minimal path in a space having a degree of curvature dependent on the material entities which exist in it, rather than having its path bent by the attraction between it and other material bodies, all of them existing in an absolute or receptacle-like space. (shrink)

This work inaugurates a critical inquiry into whether the ideas of Karl Popper, a philosopher of science, are used by astronomers and astrophysicists, a practicing community of scientists. It examines four basic components of Karl Popper's philosophy— falsification, prohibition, simplicity, and risk taking— and the extent that these themes become integrated into recent scientific literature on astronomy, astrophysics, cosmology, and stellar evolutionary theory. It concludes that the philosophy of science is highly relevant to the practice of astronomy, and that Karl (...) Popper plays a unique role in directing different communities of astronomers and cosmologists. (shrink)

The observations which are compatible with temporal origins of the earth, the solar system and the universe are briefly mentioned, prior to examining the assumptions implicit in the hypothesis of temporal origin which the observations were designed to test. No decisive observation enables us to distinguish between theories of a temporal origin of the universe and the theories of infinite time (continuous creation); the aspects of the galaxies offer no test of either theory without invoking additional assumptions. Curvature of time (...) is rejected as being a complication at present scientifically unnecessary, as is also the hypothesis of continuous creation. The view maintained is that the temporal theory based on linear extrapolation is acceptable until it be disproved. Various new techniques which may be useful in attempting to refute this theory are discussed. (shrink)

On the basis of his unpublished thesis ‘Gewohnheit und Gesetzerlebnis in der Erziehung’ a historical reconstruction is given of the genesis of Popper's ideas on induction and demarcation which differs radically from his own account in Unended quest. It is shown not only that he wholeheartedly endorses inductive epistemology and psychology but also that his ‘demarcation’ criterion is inductivistic. Moreover it is shown that his later demarcation thesis arises not from his worries about, on the one hand, Marxism and psychoanalysis (...) and, on the other hand, Einstein's physics, but rather from his urgent preoccupation with providing pedagogy with a psychological foundation, which has its sources in Karl Bühler's cognitive psychology as well as, surprisingly, Adler's Characterology. Aside from Adler some lesser known psychologists, such as Karl Groos, will also be seen to have played a formative role on Popper's early thinking. (shrink)

Summary During the 1930 and 1940s, the small world of cosmologists was buzzing with philosophical and methodological questions. The debate was stirred by Edward Milne's cosmological model, which was deduced from general principles that had no link with observation. Milne's approach was to have an important impact on the development of modern cosmology. But this article shows that it is an exaggeration to intimate, as some authors have done recently, that Milne's rationalism went on to infiltrate the discipline.