Das Thema Christentum und Judentum lässt sich heute nur interdisziplinär bearbeiten, also in Zusammenarbeit von Theologie, Religionswissenschaft, Judaistik, Literaturwissenschaft, Geschichte und Philosophie. Aus allen genannten Disziplinen fallen wesentliche Perspektiven auf die Position Schleiermachers. Der Kongressband vereinigt sämtliche Vorträge, die im Rahmen des Plenums und der drei Sektionen gehalten wurden.

In this paper I explore humility as a paradigm, with reference to recent debates over the morality and rationality of emotions, and to the relation between religion and emotion. In Ancient Greek ethics, humility did not yet play a role; with the rise of Christianity, however, it becomes one of the cardinal virtues -- only to disappear again with the onset of modernity. Against a culture-pessimistic interpretation of this development, this article begins by characterising the relation between virtue and emotion, (...) before reconstructing the inner rationality of humility and showing how it can be traced through several transformations to a modern ethics of responsibility. Against this background, possible manifestations of the humble attitude in the present are made plausible. (shrink)

Originally presented as the author's thesis (doctoral - Halle-Wittenberg) under the title: Die Krise des theologischen Wahrheitsbegriffs.

Nowadays Troeltsch's discussion of Calvinism is usually – if unjustly – regarded as a confessional typology which has had its day. An analysis of the relevant texts from Troeltsch's time in Heidelberg both clarifies his understanding in the context of his theory of Protestantism and at the same time its distinctiveness from Weber's famous study of Calvinism. Troeltsch's discussion can then be reconstructed as a good example of the application of his historical method. The interdependence of factors emerging from the (...) history of ideas and social history reveals an ambivalent and distinct history of development which moves beyond confessional boundaries. On this basis Protestantism is shown to have a constructive relationship to western social ideas including democracy, human rights and pluralist society. In distinction to the over-emphasis on Lutheranism of his contemporaries, Troeltsch regards this series of developments as the contribution of Calvinism to a religiously-based culture of responsibility under the conditions of modernity. (shrink)

Pope Benedict XVI's lecture at the University of Regensburg recently showed that liberal theology is not only an epoch of the past. Now it also serves as a disputable alternative among rivalling understanding of Christianity. This essay, however, demonstrates its timeliness on the basis of Wilhelm Herrmann's and Rudolf Otto's analyses of Luther, which have received little attention in research concerning liberal theology. Far beyond hero worship, their interpretations can be regarded as exemplary forms of a methodically deliberated culture of (...) remembrance. It also plays a central role in both authors' oeuvres. In addition, this case study demonstrates that the reconstruction of intellectual history and systematic concepts can be mutually relevant and productive. While Herrmann receives important contributions from Luther for a contemporary Christology, Otto develops a theory of religious experience in a nutshell based on the reformer's view of the Holy Spirit. (shrink)

Anlässlich des 75. Todestages von Rudolf Otto veranstaltete die Philipps-Universität Marburg einen Internationalen Kongress. Ottos Religionsbegriff basiert auf der Erfahrung des Heiligen. Das stellt für die gegenwärtigen Debatten in der Theologie, der Religionsphilosophie, der Religionsästhetik und schließlich auch wieder in der Religionswissenschaft ein beachtliches Anregungspotenzial bereit. Der Band dokumentiert die wichtigsten Ergebnisse der gegenwärtigen Beschäftigung mit Otto in internationaler Perspektive.

Bohmian mechanics is a theory about point particles moving along trajectories. It has the property that in a world governed by Bohmian mechanics, observers see the same statistics for experimental results as predicted by quantum mechanics. Bohmian mechanics thus provides an explanation of quantum mechanics. Moreover, the Bohmian trajectories are defined in a non-conspiratorial way by a few simple laws.

In a recent paper Conway and Kochen, Found. Phys. 36, 2006, claim to have established that theories of the Ghirardi-Rimini-Weber (RW) type, i.e., of spontaneous wave function collapse, cannot be made relativistic. On the other hand, relativistic GRW-type theories have already been presented, in my recent paper, J. Stat. Phys. 125, 2006, and by Dowker and Henson, J. Stat. Phys. 115, 2004. Here, I elucidate why these are not excluded by the arguments of Conway and Kochen.

Given an ontological model of a quantum system, a “genuine measurement,” as opposed to a quantum measurement, means an experiment that determines the value of a beable, i.e., of a variable that, according to the model, has an actual value in nature before the experiment. We prove a theorem showing that in every ontological model, it is impossible to measure all beables. Put differently, there is no experiment that would reliably determine the ontic state. This result shows that the positivistic (...) idea that a physical theory should only involve observable quantities is too optimistic. (shrink)

Among several possibilities for what reality could be like in view of the empirical facts of quantum mechanics, one is provided by theories of spontaneous wave function collapse, the best known of which is the Ghirardi–Rimini–Weber theory. We show mathematically that in GRW theory there are limitations to knowledge, that is, inhabitants of a GRW universe cannot find out all the facts true of their universe. As a specific example, they cannot accurately measure the number of collapses that a given (...) physical system undergoes during a given time interval; in fact, they cannot reliably measure whether one or zero collapses occur. Put differently, in a GRW universe certain meaningful, factual questions are empirically undecidable. We discuss several types of limitations to knowledge and compare them with those in other versions of quantum mechanics, such as Bohmian mechanics. Most of our results also apply to observer-induced collapses as in orthodox quantum mechanics. 1 Introduction1.1 Known examples of limitations to knowledge1.2 Remarks2 Brief Review of GRW Theories2.1 The GRW process2.2 GRWm2.3 GRWf3 First Examples of Limitations to Knowledge in GRW Theories4 Measurements of Flashes in GRWf, or of Collapses in GRWm4.1 An example in which ψ is known4.2 Other choices of ψ4.3 Experiments beginning before t24.4 If ψ is random4.5 Optimal way of distinguishing two density matrices4.6 If ψ is unknown5 Measurements of m in GRWmAppendix. (shrink)

Let ℋ be a finite-dimensional complex Hilbert space and D the set of density matrices on ℋ, i.e., the positive operators with trace 1. Our goal in this note is to identify a probability measure u on D that can be regarded as the uniform distribution over D. We propose a measure on D, argue that it can be so regarded, discuss its properties, and compute the joint distribution of the eigenvalues of a random density matrix distributed according to this (...) measure. (shrink)

Detlef Dürr (1951–2021) was a theoretical and mathematical physicist who worked particularly on the foundations of quantum mechanics, electromagnetism, and statistical mechanics. This piece is a rather personal look back at him and his science.

This is a comment on J. A. Barrett's article 'The Preferred-Basis Problem and the Quantum Mechanics of Everything' ([2005]), which concerns theories postulating that certain quantum observables have determinate values, corresponding to additional (often called 'hidden') variables. I point out that it is far from clear, for most observables, what such a postulate is supposed to mean, unless the postulated additional variable is related to a clear ontology in space-time, such as particle world lines, string world sheets, or fields.

Papers originally presented at a symposium in Bad Homburg, Germany, in April 1993.

We consider an isolated, macroscopic quantum system. Let H be a microcanonical “energy shell,” i.e., a subspace of the system’s Hilbert space spanned by the (finitely) many energy eigenstates with energies between E and E + δE. The thermal equilibrium macro-state at energy E corresponds to a subspace Heq of H such that dim Heq/ dim H is close to 1. We say that a system with state vector ψ H is in thermal equilibrium if ψ is “close” to Heq. (...) We show that for “typical” Hamiltonians with given eigenvalues, all initial state vectors ψ0 evolve in such a way that ψt is in thermal equilibrium for most times t. This result is closely related to von Neumann’s quantum ergodic theorem of 1929. (shrink)