Requirements for a Fundamental Physical Theory. The search for a so-called ‘Theory of Everything’ which should lead to the unification of all fundamental forces is seen, at present, as a matter of priority within theoretical high-energy physics. Some physicist identify this Theory of Everything today with aspecific type of superstring theory or its intended conceptual continuation, called M-Theory. The objective of this article is the discussion of the requirements a fundamental physical theory has to comply with. This question can only (...) be clarified if one takes into account that the claim that a physical theory is all-encompassing takes forgranted some tacit prerequisites which concern the conceptual and epistemological foundations of science and, not least, the question for the realizability of its reductionistic unity. (shrink)

Obwohl der Stringansatz als Versuch einer nomologisch vereinheitlichten Erfassung aller Wechselwirkungen, inklusive der Gravitation, schon über drei Jahrzehnte existiert, sind die ihm zugrundeliegenden physikalischen Prinzipien noch völlig unklar; und es gibt nicht die geringste empirisch überprüfbare, quantitative Vorhersage. Ohne empirische Daten, die mit den etablierten Theorien - quantenfeldtheoretischem Standardmodell und Allgemeiner Relativitätstheorie - unvereinbar wären, liefert nur die konzeptionelle Inkompatibilität beider, gemeinsam mit der Vereinheitlichungsidee, eine Motivation für den Stringansatz. Mit diesem droht jedoch die Physik, unter konsequenter Weiterführung ihrer bisher (...) erfolgreichen Strategien, den methodologischen Rahmen der empirischen Wissenschaften zu überschreiten. (shrink)

The quest for an all-encompassing theory, finally intended to give a solution to the problem of the unification of all natural forces, is seen today as one of the most important objectives of theoretical high-energy physics. This so-called 'Theory of Everything' is, actually, identified by some theoretical physicists with superstring theory. But superstring theory is in a crucial way incomplete. And, above all, it has fundamental problems with empirical testability – problems that make questionable its status as a physical theory (...) at all. (shrink)

The conceptual incompatibility between General Relativity and Quantum Mechanics is generally seen as a sufficient motivation for the development of a theory of Quantum Gravity. If - so a typical argumentation - Quantum Mechanics gives a universally valid basis for the description of the dynamical behavior of all natural systems, then the gravitational field should have quantum properties, like all other fundamental interaction fields. And, if General Relativity can be seen as an adequate description of the classical aspects of gravity (...) and spacetime - and their mutual relation -, this leads, together with the rather convincing arguments against semi-classical theories of gravity, to a strategy which takes a quantization of General Relativity as the natural avenue to a theory of Quantum Gravity. And, because in General Relativity the gravitational field is represented by the spacetime metric, a quantization of the gravitational field would in some sense correspond to a quantization of geometry. Spacetime would have quantum properties. But, this direct quantization strategy to Quantum Gravity will only be successful, if gravity is indeed a fundamental interaction. Only if it is a fundamental interaction, the given argumentation is valid, and the gravitational field, as well as spacetime, should have quantum properties. - What, if gravity is instead an intrinsically classical phenomenon? Then, if Quantum Mechanics is nevertheless fundamentally valid, gravity can not be a fundamental interaction; a classical and at the same time fundamental gravity is excluded by the arguments against semi-classical theories of gravity. An intrinsically classical gravity in a quantum world would have to be an emergent, induced or residual, macroscopic effect, caused by a quantum substrate dominated by other interactions, not by gravity. Then, the gravitational field (as well as spacetime) would not have any quantum properties. And then, a quantization of gravity (i.e. of General Relativity) would lead to artifacts without any relation to nature. The serious problems of all approaches to Quantum Gravity that start from a direct quantization of General Relativity (e.g. non-perturbative canonical quantization approaches like Loop Quantum Gravity) or try to capture the quantum properties of gravity in form of a 'graviton' dynamics (e.g. Covariant Quantization, String Theory) - together with the, meanwhile, rich spectrum of (more or less advanced) theoretical approaches to an emergent gravity and/or spacetime - make this latter option more and more interesting for the development of a theory of Quantum Gravity. The most advanced emergent gravity (and spacetime) scenarios are of an information-theoretical, quantum-computational type. A paradigmatic model for the emergence of gravity and spacetime comes from the Pregeometric Quantum Causal Histories approach. (shrink)

Currently, string theory represents the only advanced approach to a unification of all interactions, including gravity. In spite of the more than thirty years of its existence, the sequence of metamorphosis it ran through, and the ever more increasing number of involved physicists, until now, it did not make any empirically testable predictions. Because there are no empirical data incompatible with the quantum field theoretical standard model of elementary particle physics and with general relativity, the only motivations for string theory (...) rest in the mutual incompatibility of the standard model and of general relativity as well as in the metaphysics of the unification program of physics, aimed at a final unified theory of all interactions including gravity. But actually, it is completely unknown which physically interpretable principles could form the basis of string theory. At the moment, "string theory" is no theory at all, but rather a labyrinthic structure of mathematical procedures and intuitions which get their justification from the fact that they, at least formally, reproduce general relativity and the standard model of elementary particle physics as low energy approximations. However, there are now strong indications that string theory does not only reproduce the dynamics and symmetries of our standard model, but a plethora of different scenarios with different low energy nomologies and symmetries. String theory seems to describe not only our world, but an immense landscape of possible worlds. So far, all attempts to find a selection principle which could be motivated intratheoretically remained without success. So, recently the idea that the low energy nomology of our world, and therefore also the observable phenomenology, could be the result of an anthropic selection from a vast arena of nomologically different scenarios entered string theory. Although multiverse scenarios and anthropic selection are not only motivated by string theory, but lead also to a possible explanation for the fine tuning of the universe, they are concepts which transcend the framework defined by the epistemological and methodological rules which conventionally form the basis of physics as an empirical science. (shrink)

The mutual conceptual incompatibility between General Relativity and Quantum Mechanics / Quantum Field Theory is generally seen as the most essential motivation for the development of a theory of Quantum Gravity. It leads to the insight that, if gravity is a fundamental interaction and Quantum Mechanics is universally valid, the gravitational field will have to be quantized, not at least because of the inconsistency of semi-classical theories of gravity. The objective of a theory of Quantum Gravity would then be to (...) identify the quantum properties and the quantum dynamics of the gravitational field. If this means to quantize General Relativity, the general-relativistic identification of the gravitational field with the spacetime metric has to be taken into account. The quantization has to be conceptually adequate, which means in particular that the resulting quantum theory has to be background-independent. This can not be achieved by means of quantum field theoretical procedures. More sophisticated strategies, like those of Loop Quantum Gravity, have to be applied. One of the basic requirements for such a quantization strategy is that the resulting quantum theory has a classical limit that is (at least approximately, and up to the known phenomenology) identical to General Relativity. However, should gravity not be a fundamental, but an induced, residual, emergent interaction, it could very well be an intrinsically classical phenomenon. Should Quantum Mechanics be nonetheless universally valid, we had to assume a quantum substrate from which gravity would result as an emergent classical phenomenon. And there would be no conflict with the arguments against semi-classical theories, because there would be no gravity at all on the substrate level. The gravitational field would not have any quantum properties to be captured by a theory of Quantum Gravity, and a quantization of General Relativity would not lead to any fundamental theory. The objective of a theory of 'Quantum Gravity' would instead be the identification of the quantum substrate from which gravity results. The requirement that the substrate theory has General Relativity as a classical limit – that it reproduces at least the known phenomenology – would remain. The paper tries to give an overview over the main options for theory construction in the field of Quantum Gravity. Because of the still unclear status of gravity and spacetime, it pleads for the necessity of a plurality of conceptually different approaches to Quantum Gravity. (shrink)

String Theory is the result of the conjunction of three conceptually independent elements: the metaphysical idea of a nomological unity of the forces, the model-theoretical paradigm of Quantum Field Theory, and the conflict resulting from classical gravity in a quantum world - the motivational starting point of the search for a theory of Quantum Gravity. String Theory is sometimes assumed to solve this conflict: by means of an application of the model-theoretical apparatus of Quantum Field Theory, interpreting gravity as the (...) result of an exchange of gravitons, taken here to be dynamical states of the string. But, String Theory does not really solve the conflict. Rather it exemplifies the inadequacy of the apparatus of Quantum Field Theory in the context of Quantum Gravity: After several decades of development it still exists only in an essentially perturbative formulation. And, due to its quantum field theoretical heritage, it is conceptually incompatible with central implications of General Relativity, especially those resulting from the general relativistic relation between gravity and spacetime. All known formulations of String Theory are background-dependent. And no physical motivation is given for this conceptual incompatibility. On the other hand, although String Theory identifies all gauge bosons as string states, it was not even possible to reproduce the Standard Model. Instead, String Theory led to a multitude of internal problems - and to the plethora of low-energy scenarios with different nomologies and symmetries, known as the String Landscape. All attempts to find a dynamically motivated selection principle remained without success, leaving String Theory without any predictive power. The nomological unification of the fundamental forces, including gravity, is only achieved in a purely formal way within the model-theoretical paradigm of Quantum Field Theory - by means of physically unmotivated epicycles like higher dimensionality, Calabi-Yau spaces, branes, etc. Finally, the possibility remains that some of the central assumptions of String Theory are physically wrong. On the one hand, the idea of a nomological unity of the forces could be simply wrong. On the other hand, even if a nomological unity of all fundamental forces should be realized in nature, the possibility remains that gravity is not a fundamental force, but a residual, emergent and possibly intrinsically classical phenomenon, resulting from a quantum substrate without any gravitational degrees of freedom. (shrink)

String theory is at the moment the only advanced approach to a unification of all interactions, including gravity. But, in spite of the more than 30 years of its existence, it does not make any empirically testable predictions, and it is completely unknown which physically interpretable principles could form the basis of string theory. At the moment, “string theory” is no theory at all, but rather a labyrinthic structure of mathematical procedures and intuitions. The only motivations for string theory consist (...) in the mutual incompatibility of the standard model of quantum field theory and of general relativity as well as in the metaphysics of the unification program of physics, aimed at a final unified theory of all interactions, including gravity. The article gives a perspective on the problems leading to and resulting from this situation. (shrink)

Michael Walzer is one of the world's most important political thinkers. In this book, Toby J. Reiner provides the most wide-ranging and up-to-date introduction to his work available. Examining Walzer's multivarious writings and work, Reiner develops an illuminating new interpretation of his thought that no political theorist can afford to miss.

Keine ausführliche Beschreibung für "Reflexion und Gefühl" verfügbar.

The article presents the sociology of knowledge approach to discourse (SKAD). SKAD, which has been in the process of development since the middle of the 1990s, is now a widely used framework among social scientists in discourse research in the German-speaking area. It links arguments from the social constructionist tradition, following Berger and Luckmann, with assumptions based in symbolic interactionism, hermeneutic sociology of knowledge, and the concepts of Michel Foucault. It argues thereby for a consistent theoretical and methodological grounding of (...) a genuine social sciences perspective on discourse interested in the social production, circulation and transformation of knowledge, that is in social relations and politics of knowledge in the so-called ‘knowledge societies’. Distancing itself from Critical Discourse Analysis, Linguistics, Ethnomethodology inspired discourse analysis and the Analysis of Hegemonies, following Laclau and Mouffe, SKAD’s framework has been built up around research questions and concerns located in the social sciences, referring to public discourse and arenas as well as to more specific fields of (scientific, religious, etc.) discursive struggles and controversies around problematizations (Foucault). (shrink)

Hamanns letztes Werk wird hier begriffen als Selbstdeutung und bewusster Abschluss der Autorschaft. Hamann formuliert in diesem Text seinen prophetischen Anspruch, mit dem er der Philosophie seiner Zeit entgegentrat. Die Basis dieses Anspruchs, Hamanns figurales Denken, erweist sich als Zentrum seines Denkens überhaupt. Daraus ergibt sich auch eine differenzierte Einschätzung seiner Aufklärungskritik. Im «Anhang» wird eine neue Edition des «Fliegenden Briefes» mit kritischem Apparat und Kommentar geboten.

This is not a work of mine. For some reason, I am unable to remove it from my page. It is a list of Dr. Reiner Schürmann's lecture notes for courses that he taught at the New School for Social Research (aka The New School).

This paper puts forward a theoretical framework for the analysis of expertise and experts in contemporary societies. It argues that while prevailing approaches have come to see expertise in various forms and functions, they tend to neglect the broader historical and societal context, and importantly the relational aspect of expertise. This will be discussed with regard to influential theoretical frameworks, such as laboratory studies, regulatory science, lay expertise, post-normal science, and honest brokers. An alternative framework of expertise is introduced, showing (...) the limitations of existing frameworks and emphasizing one crucial element of all expertise, which is their role in guiding action. (shrink)

Am Leitfaden des Begriffs Malum oeconomicum fuhrt das Buch seine Leser in einen Dialog mit klassischen und zeitgenossischen Denkern uber die abgrundigen Seiten der Wirtschaft und ihre Spiegelungen in der Seele. In der Wirtschaft erscheinen Menschen tendenziell fureinander als blosse Werkzeuge ihrer Bedurfnisbefriedigung, andererseits wird wirtschaftliche Leistung mit Bedeutungen aufgeladen, die an das Heil in der religiosen Sphare gemahnen. Im Kapitalismus der Moderne entfaltet sich aus der Wechselwirkung zwischen einer entfesselten Produktion und den Antrieben des Innenlebens eine zuvor unbekannte Dynamik. (...) Ist diese in liberalen Theorien ein Anlass, das Malum oeconomicum fur verschwunden zu erklaren, so machen Fundamentalkritiker des globalen Kapitalismus geltend, dass dieser illusionare Bedurfnisse weckt und unversohnliche Gegensatze zwischen Arm und Reich hervorruft, deren Sprengkraft jeden sozialen Zusammenhalt gefahrdet. Aus der Lekture von Platon, Aristoteles, Thomas Hobbes, Bernard Mandeville, Adam Smith, Thomas Robert Malthus, Karl Marx, Max Weber, Georg Simmel, John Maynard Keynes, Martin Heidegger, Herbert Marcuse, John Rawls und Amartya Sen ergeben sich Aussichten auf das Wirtschaftsgeschehen, die uber die Engfuhrungen heutiger Debatten weit hinausweisen. (shrink)

Transport through the nuclear pore complex (NPC), a keystone of the eukaryotic building plan, is known to involve a large channel and an abundance of phenylalanine–glycine (FG) protein domains serving as binding sites for soluble nuclear transport receptors and their cargo complexes. However, the conformation of the FG domains in vivo, their arrangement in relation to the transport channel and their function(s) in transport are still vividly debated. Here, we revisit a number of representative transport models—specifically Brownian affinity gating, selective (...) phase gating, reversible FG domain collapse, and reduction of dimensionality (ROD)—in the light of new data obtained by optical single transporter recording, optical superresolution microscopy, artificial nanopores, and many other techniques. The analysis suggests that a properly adapted, simplified version of the ROD model accounts well for the available data. This has implications for nucleocytoplasmic transport in general. (shrink)

Mensch und Natur.--Leben und Tod.--Ethische Fragen.--Religionsphilosophische Probleme.--Erkenntnistheorie.--Staat und Gesellschaft.

Just-war theory has a long and distinguished history that stretches back to the Christian theologians of medieval Europe. Yet principles of just war must develop alongside social norms, standards of military practice and technology, and civilian-military relationships. Since World War II, and especially since American involvement in Vietnam, military ethics has developed into an academic cottage industry. As commonly taught to undergraduates and military practitioners, contemporary just-war theory seeks to ensure the political sovereignty and territorial integrity of nation-states. The theory (...) insists that the only just wars are defensive ones and forbids wars of national aggrandizement. On this view, because of the right to collective self-determination, wars must not seek to remake the world order, as that would undermine state sovereignty.In recent decades, however, cosmopolitan philosophers have challenged various aspects of the traditional edifice in an attempt to use just-war theory to enhance the protection of human rights around the world. Scholars have argued for greater scope for humanitarian intervention to protect individuals against their own government, for principles of justice after war to ensure that all states are legitimate, and most radically, for the responsibility of ordinary combatants to assess for themselves the justice of their military's cause. On this last argument, because combatants whose cause is just have done nothing to lose their immunity from harm, attacking them is unjust, and combatants whose cause is unjust cannot fight with discrimination.This publication surveys these recent developments, and it finds that they provide a radical challenge to both the theory and the practice of contemporary warfare. Of particular importance is its insistence on the need to strengthen international institutions, so as to provide combatants with an impartial perspective on their side's cause, and to strengthen military ethics education; and its suggestion that policies on dishonorable discharge be rethought. However, this monograph also challenges certain aspects of the new approach, suggesting important connections between military ethics and democratic theory and practice. (shrink)

It is often said that knowledge is power, but more often than not relevant knowledge is not used when political decisions are made. This book examines how political decisions relate to scientific knowledge and what factors determine the success of scientific research in influencing policy. The authors take a comparative and historical perspective and refer to well-known theoretical frameworks, but the focus of the book is on three case studies: the discourse of racism, Keynesianism, and climate change. These cases cover (...) a number of countries and different time periods. In all three the authors see a close link between 'knowledge producers' and political decision makers, but show that the effectiveness of the policies varies dramatically. This book will be of interest to scientists, decision makers and scholars alike. (shrink)

Der Autor: Reiner Ruffing ist promovierter Philosoph, gibt in der Erwachsenenbildung und an Universitäten Lehrveranstaltungen und ist seit mehr als 20 Jahren Lehrer.