Coordinate-based approaches to physical theories remain standard in mainstream physics but are largely eschewed in foundational discussion in favour of coordinate-free differential-geometric approaches. I defend the conceptual and mathematical legitimacy of the coordinate-based approach for foundational work. In doing so, I provide an account of the Kleinian conception of geometry as a theory of invariance under symmetry groups; I argue that this conception continues to play a very substantial role in contemporary mathematical physics and indeed that supposedly ``coordinate-free'' differential geometry (...) relies centrally on this conception of geometry. I discuss some foundational and pedagogical advantages of the coordinate-based formulation and briefly connect it to some remarks of Norton on the historical development of geometry in physics during the establishment of the general theory of relativity. (shrink)

This is a discussion of how we can understand the world-view given to us by the Everett interpretation of quantum mechanics, and in particular the role played by the concept of 'world'. The view presented is that we are entitled to use 'many-worlds' terminology even if the theory does not specify the worlds in the formalism; this is defended by means of an extensive analogy with the concept of an 'instant' or moment of time in relativity, with the lack of (...) a preferred foliation of spacetime being compared with the lack of a preferred basis in quantum theory. Implications for identity of worlds over time, and for relativistic quantum mechanics, are discussed. (shrink)

"Cornell Paperback." Includes index. Bibliography: p. 163-165.

What is called ``orthodox'' quantum mechanics, as presented in standard foundational discussions, relies on two substantive assumptions --- the projection postulate and the eigenvalue-eigenvector link --- that do not in fact play any part in practical applications of quantum mechanics. I argue for this conclusion on a number of grounds, but primarily on the grounds that the projection postulate fails correctly to account for repeated, continuous and unsharp measurements and that the eigenvalue-eigenvector link implies that virtually all interesting properties are (...) maximally indefinite pretty much always. I present an alternative way of conceptualising quantum mechanics that does a better job of representing quantum mechanics as it is actually used, and in particular that eliminates use of either the projection postulate or the eigenvalue-eigenvector link, and I reformulate the measurement problem within this new presentation of orthodoxy. (shrink)

Mathematically, gauge theories are extraordinarily rich --- so rich, in fact, that it can become all too easy to lose track of the connections between results, and become lost in a mass of beautiful theorems and properties: indeterminism, constraints, Noether identities, local and global symmetries, and so on. -/- One purpose of this short article is to provide some sort of a guide through the mathematics, to the conceptual core of what is actually going on. Its focus is on the (...) Lagrangian, variational-problem description of classical mechanics, from which the link between gauge symmetry and the apparent violation of determinism is easy to understand; only towards the end will the Hamiltonian description be considered. -/- The other purpose is to warn against adopting too unified a perspective on gauge theories. It will be argued that the meaning of the gauge freedom in a theory like general relativity is (at least from the Lagrangian viewpoint) significantly different from its meaning in theories like electromagnetism. The Hamiltonian framework blurs this distinction, and orthodox methods of quantization obliterate it; this may, in fact, be genuine progress, but it is dangerous to be guided by mathematics into conflating two conceptually distinct notions without appreciating the physical consequences. (shrink)

A common strategy unites much that philosophers have written about the virtues. The strategy can be traced back at least to Aristotle, who suggested that human beings have a characteristic function or activity, and that the virtues are traits of character which enable humans to perform this kind of activity excellently or well. The defining feature of this approach is that it treats the virtues as functional concepts, to be both identified and justified by reference to some independent goal or (...) end which they enable people to attain. Some recent philosophers seem to have hoped that by following this perfectionist strategy, we might attain a more convincing account of our moral practices than rule-based theories of ethics have been able to provide. (shrink)

(Part of a symposium on an OUP collection of Paul Russell's papers on free will and moral responsibility). Paul Russell’s The Limits of Free Will is more than the sum of its parts. Among other things, Limits offers readers a comprehensive look at Russell’s attack on the problematically idealized assumptions of the contemporary free will debate. This idealization, he argues, distorts the reality of our human predicament. Herein I pose a dilemma for Russell’s position, critical compatibilism. The dilemma illuminates the (...) tension between Russell’s critical and compatibilist commitments. The problem is not obviously insurmountable, and as a compatibilist who is sympathetic to the view, my aim is to spark further discussion. (shrink)

I distinguish between two versions of the black hole information-loss paradox. The first arises from apparent failure of unitarity on the spacetime of a completely evaporating black hole, which appears to be non-globally-hyperbolic; this is the most commonly discussed version of the paradox in the foundational and semipopular literature, and the case for calling it `paradoxical' is less than compelling. But the second arises from a clash between a fully-statistical-mechanical interpretation of black hole evaporation and the quantum-field-theoretic description used in (...) derivations of the Hawking effect. This version of the paradox arises long before a black hole completely evaporates, seems to be the version that has played a central role in quantum gravity, and is genuinely paradoxical. After explicating the paradox, I discuss the implications of more recent work on AdS/CFT duality and on the `Firewall paradox', and conclude that the paradox is if anything now sharper. The article is written at a introductory level and does not assume advanced knowledge of quantum gravity. (shrink)

I provide a fairly systematic analysis of when quantities that are variant under a dynamical symmetry transformation should be regarded as unobservable, or redundant, or unreal; of when models related by a dynamical symmetry transformation represent the same state of affairs; and of when mathematical structure that is variant under a dynamical symmetry transformation should be regarded as surplus. In most of these cases the answer is `it depends': depends, that is, on the details of the symmetry in question. A (...) central feature of the analysis is that in order to draw any of these conclusions for a dynamical symmetry it needs to be understood in terms of its possible extensions to other physical systems, in particular to measurement devices. (shrink)

I point out a radical indeterminism in potential-based formulations of Newtonian gravity once we drop the condition that the potential vanishes at infinity. This indeterminism, which is well known in theoretical cosmology but has received little attention in foundational discussions, can be removed only by specifying boundary conditions at all instants of time, which undermines the theory's claim to be fully cosmological, i.e., to apply to the Universe as a whole. A recent alternative formulation of Newtonian gravity due to Saunders (...) pp.22-48) provides a conceptually satisfactory cosmology but fails to reproduce the Newtonian limit of general relativity in homogenous but anisotropic universes. I conclude that Newtonian gravity lacks a fully satisfactory cosmological formulation. (shrink)

Holistic perception is an antidote to the subject–object divide, a divide that leads to a mechanistic understanding of the world and can see human beings only in terms of parts, without a robust articulation of wholeness. In this piece, I argue that philosopher of science Henri Bortoft offers an empirically grounded theory, based on consciousness studies, which recasts the problem of the many and the one, offering insight into just such a holistic perception. I further argue that Samuel Taylor Coleridge's (...) philosophy of unity and multiplicity agrees in many respects with that of Bortoft. However, Coleridge draws further implications of his philosophy for Trinitarian theology. I will argue, in line with Bortoft and Coleridge, that perception is a hinge point in this discussion, allowing the move between the discussion of wholeness, subjectivity, and identity. I conclude that a holistic perceptual shift reconstitutes the human person in a way that is theologically significant, especially with respect to Christian Trinitarian doctrine. (shrink)

Mentioning products or brands on Facebook enables individuals to display an ideal self to others through a form of virtual conspicuous consumption. Drawing on conspicuous donation behaviour literature, we investigate ‘conspicuous virtue signalling’, as conspicuous consumption on Facebook. CVS occurs when an individual mentions a charity on their Facebook profile. We investigate need for uniqueness and attention to social comparison information as antecedents of two types of CVS–self-oriented and other-oriented. We also explore the relationship between CVS and self-esteem, and offline (...) prosocial and unethical behaviour intentions. Data from two studies, a college survey and an adult survey via MTurk, were analysed using structural equation modelling. Results indicate that NFU predicts both forms of CVS, while ATSCI influences both forms of CVS for adults and other-oriented CVS for students. Self-esteem is enhanced by self-oriented CVS. Self-oriented CVS predicts donation intention whereas other-oriented CVS significantly reduces donation intention for both samples. Furthermore, a significant relationship between CVS and purchase intention of counterfeit luxury goods is revealed. Findings provide insights into conspicuous virtue signalling and the relationship between CVS on Facebook and offline behavioural intentions. (shrink)

A summary of basics for student and seminarian.

Software piracy has become recognized as a major problem for the software industry and for business. One research approach that has provided a theoretical framework for studying software piracy has been to place the illegal copying of software within the domain of ethical decision making assumes that a person must be able to recognize software piracy as a moral issue. A person who fails to recognize a moral issue will fail to employ moral decision making schemata. There is substantial evidence (...) that many individuals do not perceive software piracy to be an ethical problem. This paper applies social exchange theory, in particular equity theory, to predict the influence of situational factors on subjects' intentions to participate in software piracy. Consistent with the predictions of equity theory this study found that input and outcome situational variables significantly effect a person's intentions to commit software piracy. (shrink)

I make the case that the Universe according to unitary quantum theory has a branching structure, and so can literally be regarded as a "many-worlds" theory. These worlds are not part of the _fundamental_ ontology of quantum theory - instead, they are to be understood as structures, or patterns, emergent from the underlying theory, through the dynamical process of decoherence. That they are structures in this sense does not mean that they are in any way unreal: indeed, pretty much all (...) higher-level ontology in science, from tables to phonons to tigers, is likewise emergent. Unitary quantum theory is therefore a "many-worlds" theory without any modification of the mathematical structure of the theory: the Everett interpretation does not consist in adding worlds to the formalism, but in realising that they are there already. Our grounds for accepting the reality of those worlds is no more, but no less, than our grounds for accepting any other not-directly observable consequence of an empirically very successful theory. (shrink)

The idea of moral reform requires that morality be more than a description of what people do value, for there has to be some measure against which to assess progress. Otherwise, any change is not reform, but simply difference. Therefore, I discuss moral reform in relation to two prescriptive approaches to common morality, which I distinguish as the foundational and the pragmatic. A foundational approach to common morality (e.g., Bernard Gert’s) suggests that there is no reform of morality , but (...) of beliefs, values, customs, and practices so as to conform with an unchanging, foundational morality. If, however, there were revision in its foundation (e.g., in rationality), then reform in morality itself would be possible. On a pragmatic view, on the other hand, common morality is relative to human flourishing, and its justification consists in its effectiveness in promoting flourishing. Morality is dependent on what in fact does promote human flourishing and therefore, could be reformed. However, a pragmatic approach, which appears more open to the possibility of moral reform, would need a more robust account of norms by which reform is measured. (shrink)

The central paradigm of arti?cial intelligence is rapidly shifting toward biological models for both robotic devices and systems performing such critical tasks as network management, vehicle navigation, and process control. Here we use a recent mathematical analysis of the necessary conditions for consciousness in humans to explore likely failure modes inherent to a broad class of biologically inspired computing machines. Analogs to developmental psychopathology, in which regulatory mechanisms for consciousness fail progressively and subtly understress, and toinattentional blindness, where a narrow (...) 'syntactic band pass' de?ned by the rate distortion manifold of conscious attention results in pathological ?xation, seem inevitable. Similar problems are likely to confront other possible architectures, although their mathematical description may be far less straightforward. Computing devices constructed on biological paradigms will inevitably lack the elaborate, but poorly understood, system of control mechanisms which has evolved over the last few hundred million years to stabilize consciousness in higher animals. This will make such machines prone to insidious degradation, and, ultimately, catastrophic failure. (shrink)

This article introduces a new conceptualisation of the relationship between global distributive justice, development, and the study of peace, which we label the Responsibility for Peace (R4P). In doing so, the article examines the notion of positive peace within peace studies, its relation to arguments within global distributive justice, and to what degree this important relationship is recognised in the primary international framework to prevent and protect populations from mass atrocity crimes, the Responsibility to Protect (R2P). The article argues that (...) despite growing recognition about the links between peace and development within both R2P and global justice discussions, it remains insufficient in terms of positive peace, thus requiring a new heuristic. In response, we argue that global justice demands refocused moral commitments to jus ante bellum (establishing global justice before war) and that this necessitates greater focus on the study of positive peace mechanisms, the identification and reform of structural injustices (against structural violence), and a retooled emphasis on human-centred development that can transcend existing legacies. In other words, we need to better focus on causes and not symptoms. It is this triangulation that we label the Responsibility for Peace (R4P), which should operate both prior to, and independently of, the Responsibility to Protect (R2P). (shrink)

J’ai rencontré Marie-Jeanne Bérère à Lyon en 1994. C’était une petite femme vive, à la parole claire et précise, avec un bel accent bourguignon. Elle avait accepté une interview, à son domicile lyonnais, le 23 mars 1995. Je souhaitais la revoir pour ce numéro de CLIO, Histoire, Femmes et Sociétés sur les Chrétiennes mais elle est décédée dans l’été 2000, à 73 ans, sans avoir eu le temps de rédiger ses mémoires. Son itinéraire de femme engagée dans l’Église catholique est (...) celui d’une chrétienn... (shrink)

Inside the Team: Questions and Answers Facing Teacher Leaders is a book for K-12 teachers and leaders who face dilemmas leading teams of peers. Using Q/A scenarios and building context for leadership in practice, the authors provide answers, useful, practical tools, resources, models and conversation starters that move teams forward.

This dissertation is a critical study of rationalism in ethics: the view that acting morally is a requirement of rationality, and that all agents consequently have reason to be moral. The study attempts first to reconstruct the essential elements of the rationalist approach in ethics, and then to identify the most critical obstacles in the way of that approach. By way of reconstruction, it is argued that the rationalist in ethics needs to construe rationality as a set of ideal principles (...) or norms, and to affirm a connection between one's having a practical reason and the capacity of rationality to lead one to be motivated to act on the reason. This latter claim amounts to a version of internalism, and some time is devoted to the task--hitherto neglected by philosophers--of clarifying and defending the connection which it postulates between practical reasons and the motivation to act on them. Given internalism, the burden on the rationalist is to show that rational reflection can by itself lead to the motivation to act on moral reasons. Opponents of rationalism have characteristically challenged the very possibility of such purely rational motivations, and the dissertation considers next the arguments that have been offered for this broadly Humean position. The conclusion is reached that there are no plausible a priori arguments against the very possibility of a rationalist explanation of motivation. This does not however represent a vindication of the rationalist approach: there is room for a pragmatic argument against purely rational explanations of motivation, and the dissertation concludes by offering such an argument, focussing in particular on the case of prudence and prudential reasons. (shrink)

The Practice of Value is an exploration of a pervasive but puzzling aspect of our world: value. The starting-point is the Berkeley Tanner Lectures delivered in 2001 by the leading moral theorist Joseph Raz. His aim is to make sense of the dependence of value on social practice, without falling back on cultural relativism. The lectures are followed by discussions from three eminent philosophers, Christine Korsgaard, Robert Pippin, and Bernard Williams, and a response from Raz. The result is a fascinating (...) debate, accessible to readers throughout and beyond philosophy, about the relations between human values and human life. (shrink)

Jack knew the contract was unreasonable, but did that give his company a right to fudge on specifications?