This contributed volume is the result of a July 2010 workshop at the University of Wuppertal Interdisciplinary Centre for Science and Technology Studies which brought together world-wide experts from physics, philosophy and history, in order to address a set of questions first posed in the 1950s: How do we compare spacetime theories? How do we judge, objectively, which is the “best” theory? Is there even a unique answer to this question? -/- The goal of the workshop, and of this book, (...) is to contribute to the development of a meta-theory of spacetime theories. Such a meta-theory would reveal insights about specific spacetime theories by distilling their essential similarities and differences, deliver a framework for a class of theories that could be helpful as a blueprint to build other meta-theories, and provide a higher-level viewpoint for judging which theory most accurately describes nature. But rather than drawing a map in broad strokes, the focus is on particularly rich regions in the “space of spacetime theories.” -/- This work will be of interest to physicists, as well as philosophers and historians of science working with or interested in General Relativity and/or Space, Time and Gravitation more generally. (shrink)

Hermann Weyl was one of the early contributors to the mathematics of general relativity. This article argues that in 1929, for the formulation of a general relativistic framework of the Dirac equation, he both abolished and preserved in modified form the conceptual perspective that he had developed earlier in his “analysis of the problem of space.” The ideas of infinitesimal congruence from the early 1920s were aufgehoben in the general relativistic framework for the Dirac equation. He preserved the central idea (...) of gauge as a “purely infinitesimal” aspect of symmetries in a group extension schema. With respect to methodology, however, Weyl gave up his earlier preferences for relatively a-priori arguments and tried to incorporate as much empiricism as he could. This signified a clearly expressed empirical turn for him. Moreover, in this step he emphasized that the mathematical objects used for the representation of matter structures stood at the center of the construction, rather than interaction fields which, in the early 1920s, he had considered as more or less derivable from geometrico-philosophical considerations. (shrink)

Nous présentons dans cet article la genèse du projet de l'Édition Hausdorff, ainsi que sa structure organisationnelle ; une discussion suit sur un des aspects centraux de l'œuvre de Hausdorff.

Nous présentons dans cet article la genèse du projet de l'Édition Hausdorff, ainsi que sa structure organisationnelle ; une discussion suit sur un des aspects centraux de l'œuvre de Hausdorff.

During his whole scientific life Hermann Weyl was fascinated by the interrelation of physical and mathematical theories. From the mid 1920s onward he reflected also on the typical difference between the two epistemic fields and tried to identify it by comparing their respective automorphism structures. In a talk given at the end of the 1940s he gave the most detailed and coherent discussion of his thoughts on this topic. This paper presents his arguments in the talk and puts it in (...) the context of the later development of gauge theories. (shrink)

Dans un discours prononcé à Zurich vers la fin des années 1940, Hermann Weyl a examiné l'épistémologie dialectique de Ferdinand Gonseth et l'a considérée comme trop strictement limitée aux aspects de changement historique. Son expérience de la philosophie diaclectique post-kantienne, en particulier la dérivation du concept de l'espace et de la matière chez Johann Gottlieb Fichte, avait constitué une base dialectique solide pour ses propres études de 1918 en une géométrie purement infinitésimale et la théorie antérieure d'un champ de matière (...) géométriquement unifié (en prolongement du programme Mie-Hilbert). Bien que Weyl se fût alors éloigné des aspects spéculatifs de la philosophie de sa jeunesse et eût montré, en particulier, moins d'enthousiasme qu'auparavant pour Fichte, il nourrissait encore de nombreux doutes sur la base culturelle de la science mathématique moderne et sur son rôle dans la culture matérielle du modernisme de pointe. Pour Weyl, la « réflexion » philosophique était une nécessité culturelle ; il se tourna alors vers lexistentialisme de Karl Jaspers et de Martin Heidegger pour trouver des raisons plus profondes, dans un mouvement comparable à son orientation vers la philosophie de Fichte après la Première Guerre mondiale. Le débat de la fin des années 1940 peut être compris comme une sorte de supplément postérieur à la Seconde Guerre mondiale par rapport à ses commentaires plus connus sur les mathématiques et les sciences naturelles publiés au milieu des années 1920. (shrink)

We study a Weyl geometric scalar tensor theory of gravity with scalar field \ and scale invariant “aquadratic” kinematical Lagrange density. The Weylian scale connection in Einstein gauge induces an additional acceleration. In the weak field, static, low velocity limit it acquires the deep MOND form of Milgrom/Bekenstein’s gravity. The energy momentum of \ leads to another add on to Newton acceleration. Both additional accelerations together imply a MOND-ian phenomenology of the model. It has unusual transition functions \, \nu _w\). (...) They imply higher phantom energy density than in the case of the more common MOND models with transition functions \, \, \mu _2\). A considerable part of it is due to the scalar field’s energy density which, in our model, gives a scale and generally covariant expression for the self-energy of the gravitational field. (shrink)

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Ever since Parmenides, one of philosophy's riddles has been how we are able to direct our thoughts to non-being. Erhard uses the problem of non-existence as the starting point for an analysis of Husserl's phenomenology. He examines Husserl's interpretation of judgments about non-being as judgments made "under assumption" and his analysis of "free fantasy." Erhard thus demonstrates that Husserl is compatible with today's non-relational theories.

Este artículo trata sobre la discusión en torno al conflicto entre la seguridad y la libertad, y, más concretamente, entre la prevención policial y los derechos de los ciudadanos. El autor va más allá de la mera afirmación de que entre esos dos polos existe una relación de tensión, e intenta fijar los elementos que en el Estado de Derecho son absolutamente irrenunciables si es que no se quiere abandonar este tipo de Estado. Analiza para ello, críticamente, la jurisprudencia del (...) Tribunal Constitucional Federal Alemán, con referencias al acervo normativo de la Unión Europea. Su conclusión es que la intervención del Estado en la esfera privada del ciudadano debe estar sujeta a límites infranqueables, también en lo que concierne al control preventivo de riesgos relacionados con el terrorismo. (shrink)

This paper analyses the change in the notion of fundamental and human rights in Germany and throughout the European Union during the process of European integration. This change, that can be summarized in the formula “from human rights to state tasks,” signifies the integration and partial amendment of the French Revolution's ideals (liberté, égalité, fraternité) with the new ideals of security, diversity and solidarity. These new ideals make it necessary for the state to play a positive role in devising, for (...) example, a policy of minority recognition and a long list of social rights. These rights are often translated into merely generic “norms on state objectives” and not directly binding law in force. This means that such rights increasingly become a political and legislative issue making it more difficult for the Courts to offer guarantees. (shrink)

Like Kant at his time, Jürgen Habermas wants to encourage the reader to use his „reasonable liberty“. There is no doubt, that the philosophical positions of Kant on the one hand and of Hegel on the other hand hold, until today, a key role in the development of the „discourse of modern age“. In order to oppose a short-circuited synthesis of both systems, which are obliged to the idea of liberty quite differently, this essay demonstrates the substantial differences regarding to (...) elementary concepts like peculiarity of the individual will, law and legislation, people and sovereignty of the people. That both philosophers differ in their interest of questioning becomes quite clear regarding to the citizen/state relation. While Hegel tries to describe the reality of the state as a „moral universe“ and therefore as „reality of reason“, Kant is interested in knowing about the potential state togetherness of individuals which have experienced in them the „radical evil“. The differences concerning the estimation of the „subjective“ individual will in its relationship to the „objective“ will of „generality“, concerning also the (Rousseauian) concept of contract and the citizens as „co-legislators“ are culminating in the relationship between „law“ and „morality“. Whereas Kant (wrongly) ignores ethos and history, Hegel is lacking the concept of „intersubjective communication“ (so Habermas states). From both insufficiencies conclusions are resulting which are important for coping with the actual difficulties with „inclusion“ and „integration“. (shrink)

It is essential for the strategy of open access self-archiving that scientific authors are given comprehensive information on publisher copyright policies. DINI, the German Initiative for Networked Information, has developed a German (and potentially multilingual) interface to the English SHERPA/RoMEO service to provide additional information on German publishers' open access policies. As a next step, this interface was enhanced to an integration layer combining different sources on publisher copyright policies. This integration layer can be used in many different contexts. Together (...) with the SHERPA/RoMEO team, DINI aims to build an international support structure for open access information. (shrink)

Die Reihe versammelt Forschung in deutscher und englischer Sprache, die die Trias aus Kultur, Text und Medium in ihrer wechselseitigen Bezogenheit zum Gegenstand der Untersuchung macht. Prozesse des Mitteilens und der Vermittlung entfalten sich stets in kulturellen Zusammenhängen, auf die sie auch zurückwirken. In der Reihe werden Kommunikationskulturen sowohl als Effekt von Formgebung als auch mit Blick auf ihre medialen Bedingungen untersucht.

Biofilms can be viewed as tissue‐like structures in which microorganisms are organized in a spatial and functional sophisticated manner. Biofilm formation requires the orchestration of a highly integrated network of regulatory proteins to establish cell differentiation and production of a complex extracellular matrix. Here, we discuss the role of the essential Bacillus subtilis biofilm activator RemA. Despite intense research on biofilms, RemA is a largely underappreciated regulatory protein. RemA forms donut‐shaped octamers with the potential to assemble into dimeric superstructures. The (...) presumed DNA‐binding mode suggests that RemA organizes its target DNA into nucleosome‐like structures, which are the basis for its role as transcriptional activator. We discuss how RemA affects gene expression in the context of biofilm formation, and its regulatory interplay with established components of the biofilm regulatory network, such as SinR, SinI, SlrR, and SlrA. We emphasize the additional role of RemA played in nitrogen metabolism and osmotic‐stress adjustment. (shrink)

Individual questions of the institutional reforms of the representative-democratic parliamentary system, such as issues of electoral law, party law, and parliamentary law, are frequently discussed. But all these reflections - and this is the principal thesis of this article - must eventually remain without success, if they do not address the preceding basic problem concerning the democratically indispensable conditions of the mental constitution of the active citizen, the „civis“. There, a key role, consciously experienced like a paradox, falls upon the (...) renunciation of the claim to absolute truth of one’s own political convictions with regard to equally „relative-absolute“ claims for validity of others. On this base the psychological presuppositions of a modern pluralistic democracy are discussed, which thereupon are to be institutionalized: e. g. the capacity to compromise, the obligation of state neutrality in religious matters, the renunciation of hate speech, the rejection of „denial of reality“, and of allegedly „finalizing“ ideologies of history. (shrink)