Most philosophical discussion of the particle concept that is afforded by quantum field theory has focused on free systems. This paper is devoted to a systematic investigation of whether the particle concept for free systems can be extended to interacting systems. The possible methods of accomplishing this are considered and all are found unsatisfactory. Therefore, an interacting system cannot be interpreted in terms of particles. As a consequence, quantum field theory does not support the inclusion of particles in our ontology. (...) In contrast to much of the recent discussion on the particle concept derived from quantum field theory, this argument does not rely on the assumption that a particulate entity be localizable. (shrink)

Further arguments are offered in defence of the position that the variant of quantum field theory (QFT) that should be subject to interpretation and foundational analysis is axiomatic quantum field theory. I argue that the successful application of renormalization group (RG) methods within alternative formulations of QFT illuminates the empirical content of QFT, but not the theoretical content. RG methods corroborate the point of view that QFT is a case of the underdetermination of theory by empirical evidence. I also urge (...) caution in extrapolating interpretive conclusions about QFT from the application of RG methods in other contexts (e.g., condensed matter physics). This paper replies to criticisms advanced by David Wallace, but aims to be self-contained. (shrink)

Analogies between classical statistical mechanics and quantum field theory played a pivotal role in the development of renormalization group methods for application in the two theories. This paper focuses on the analogies that informed the application of RG methods in QFT by Kenneth Wilson and collaborators in the early 1970's. The central task that is accomplished is the identification and analysis of the analogical mappings employed. The conclusion is that the analogies in this case study are formal analogies, and not (...) physical analogies. That is, the analogical mappings relate elements of the models that play formally analogous roles and that have substantially different physical interpretations. Unlike other cases of the use of analogies in physics, the analogical mappings do not preserve causal structure. The conclusion that the analogies in this case are purely formal carries important implications for the interpretation of QFT, and poses challenges for philosophical accounts of analogical reasoning and arguments in defence of scientific realism. Analysis of the interpretation of the cutoffs is presented as an illustrative example of how physical disanalogies block the exportation of physical interpretations from from statistical mechanics to QFT. A final implication is that the application of RG methods in QFT supports non-causal explanations, but in a different manner than in statistical mechanics. (shrink)

Quantum field theory (QFT) presents a genuine example of the underdetermination of theory by empirical evidence. There are variants of QFT—for example, the standard textbook formulation and the rigorous axiomatic formulation—that are empirically indistinguishable yet support different interpretations. This case is of particular interest to philosophers of physics because, before the philosophical work of interpreting QFT can proceed, the question of which variant should be subject to interpretation must be settled. New arguments are offered for basing the interpretation of QFT (...) on a rigorous axiomatic variant of the theory. The pivotal considerations are the roles that consistency and idealization play in this case. *Received June 2009; revised August 2009. †To contact the author, please write to: Department of Philosophy, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada; e‐mail: [email protected]. (shrink)

The consensus view among philosophers of physics is that relativistic quantum field theory does not describe particles. That is, according to QFT, particles are not fundamental entities. How is this negative conclusion compatible with the positive role that the particle notion plays in particle physics? The first part of this chapter lays out multiple lines of negative argument that all conclude that QFT cannot be given a particle interpretation. These arguments probe the properties of the `particles' in standard formulations of (...) QFT and the limited applicability of `particle' representations. The second part of the chapter surveys proposals for non-fundamental roles that the particle concept plays in particle physics. The conclusion suggests directions for future philosophical research. (shrink)

Following the experimental discovery of the Higgs boson, physicists explained the discovery to the public by appealing to analogies with condensed matter physics. The historical root of these analogies is the analogies to models of superconductivity that inspired the introduction of spontaneous symmetry breaking into particle physics in the early 1960s. We offer a historical and philosophical analysis of the analogies between the Higgs model of the electroweak interaction and the Ginsburg-Landau and Bardeen-Cooper-Schrieffer models of superconductivity, respectively. The conclusion of (...) our analysis is that both sets of analogies are purely formal in virtue of the fact that they are accompanied by substantial physical disanalogies. In particular, the formal analogies do not map the temporal, causal, or modal structures of SSB in superconductivity to temporal, causal, or modal structures in the Higgs model. These substantial physical disanalogies mean that analogies to models of superconductivity cannot supply the basis for the physical interpretation of EW SSB; however, an appreciation of the contrast between the physical interpretations of SSB in superconductivity and the Higgs model does help to clarify some foundational issues. Unlike SSB in superconductivity, SSB in the Higgs sector of the Standard Model is neither a temporal nor a causal process. We discuss the implications for the `eating' metaphor for mass gain in the Higgs model. Furthermore, the distinction between the phenomenological GL model and the dynamical BCS model does not carry over to EW models, which clarifies the desiderata for so-called `dynamical' models of EW SSB. Finally, the development of the Higgs model is an illuminating case study for philosophers of science because it illustrates how purely formal analogies can play a fruitful heuristic role in physics. (shrink)

On the basis of evidence drawn from the Waste book, Westfall and Nicholas have argued that Newton arrived at his second law of motion by reflecting on the implications of the first law. I analyze another argument in the Waste book which reveals that Newton also arrived at the second law by another very different route. On this route, it is the consideration of the third law and the principle of conservation of motion—and not the first law—that prompts Newton to (...) formulate the second law. The existence of these two routes is significant because each employs a distinct kind of reasoning about forces. Whereas the Nicholas–Westfall route via the principle of inertia bears the mark of Descartes’s influence, the alternative route proceeds from the action–reaction principle, which is widely regarded as an original Newtonian contribution to mechanics. In the course of exploring this alternate route to the second law, the origins and justification of the third law are examined.Keywords: Issac Newton; Waste book; Third law of motion; Second law of motion; Richard Westfall; John Nicholas. (shrink)

The Higgs model was developed using purely formal analogies to models of superconductivity. This is in contrast to historical case studies such as the development of electromagnetism, which employed physical analogies. As a result, quantum case studies such as the development of the Higgs model carry new lessons for the scientific realism--anti-realism debate. I argue that, by breaking the connection between success and approximate truth, the use of purely formal analogies is a counterexample to two prominent versions of the 'No (...) Miracles' Argument for scientific realism, Psillos' refined explanationist defence of realism and the Argument from History of Science for structural realism. The NMA is undermined, but the success of the Higgs model is not miraculous because there is a naturalistically acceptable explanation for its success that does not invoke approximate truth. I also suggest some possible strategies for adapting to the counterexample for scientific realists who wish to hold on to the NMA in some form. (shrink)

Although the philosophical literature on the foundations of quantum field theory recognizes the importance of Haag’s theorem, it does not provide a clear discussion of the meaning of this theorem. The goal of this paper is to make up for this deficit. In particular, it aims to set out the implications of Haag’s theorem for scattering theory, the interaction picture, the use of non-Fock representations in describing interacting fields, and the choice among the plethora of the unitarily inequivalent representations of (...) the canonical commutation relations for free and interacting fields. (shrink)

Recent case studies have revealed that purely formal analogies have been successfully used as a heuristic in physics. This is at odds with most general philosophical accounts of analogies, which require analogies to be physical in order to be justifiably used. The main goal of this paper is to supply a philosophical account that justifies the use of purely formal analogies in physics. Using Bartha’s (2010) articulation model as a starting point, I offer precise definitions of formal and physical analogies (...) and propose a new submodel of analogical reasoning that accounts for the successful use of purely formal analogies in the development of renormalization group methods for use in particle physics in the early 1970’s (Fraser 2020). Two distinctive features of this new applied mathematics submodel for analogical reasoning are that the conclusion of the argument from analogy includes both an entire model (and not only a hypothesis or a prediction) and the construction procedure for this model. A third important difference from arguments from physical analogy is that only the prima facie plausibility of the conclusion is established, and not stronger types of plausibility associated with confirmation. The use of purely formal analogies is justified because they are suited to supporting conclusions of this sort. Formulating a general philosophical account of analogies that covers purely formal analogies also serves two additional purposes: (1) to highlight the features of this case that are novel in the context of examples of analogies traditionally considered by philosophers and (2) to establish that physicists should not automatically dismiss purely formal analogies when evaluating heuristics for the development of new models. (shrink)

Philosophical analysis of spontaneous symmetry breaking (SSB) in particle physics has been hindered by the unavailability of rigorous formulations of models in quantum field theory (QFT). A strategy for addressing this problem is to use the rigorous models that have been constructed for SSB in quantum statistical mechanics (QSM) systems as a basis for drawing analogous conclusions about SSB in QFT. On the basis of an analysis of this strategy as an instance of the application of the same mathematical formalism (...) to different domains and as an instance of drawing analogies between domains, I conclude that certain structural explanations can be exported from QSM to QFT but that causal explanations cannot. (shrink)

Arguments by Sorkin (Impossible measurements on quantum fields. In: Directions in general relativity: proceedings of the 1993 International Symposium, Maryland, vol 2, pp 293–305, 1993) and Borsten et al. (Phys Rev D 104(2), 2021. https://doi.org/10.1103/PhysRevD.104.025012 ) establish that a natural extension of quantum measurement theory from non-relativistic quantum mechanics to relativistic quantum theory leads to the unacceptable consequence that expectation values in one region depend on which unitary operation is performed in a spacelike separated region. Sorkin [ 1 ] labels (...) such scenarios ‘impossible measurements’. We explicitly present these arguments as a no-go result with the logical form of a reductio argument and investigate the consequences for measurement in quantum field theory (QFT). Sorkin-type impossible measurement scenarios clearly illustrate the moral that Microcausality is not by itself sufficient to rule out superluminal signalling in relativistic quantum theories that use Lüders’ rule. We review three different approaches to formulating an account of measurement for QFT and analyze their responses to the ‘impossible measurements’ problem. Two of the approaches are: a measurement theory based on detector models proposed in Polo-Gómez et al. (Phys Rev D, 2022. https://doi.org/10.1103/physrevd.105.065003 ) and a measurement framework for algebraic QFT proposed in Fewster and Verch (Commun Math Phys 378(2):851–889, 2020). Of particular interest for foundations of QFT is that they share common features that may hold general morals about how to represent measurement in QFT. These morals are about the role that dynamics plays in eliminating ‘impossible measurements’, the abandonment of the operational interpretation of local algebras \({\mathcal {A}}(O)\) as representing possible operations carried out in region _O_, and the interpretation of state update rules. Finally, we examine the form that the ‘impossible measurements’ problem takes in histories-based approaches and we discuss the remaining challenges. (shrink)

Philosophical analysis of spontaneous symmetry breaking in particle physics has been hindered by the unavailability of rigorous formulations of models in quantum field theory. A strategy for addressing this problem is to use the rigorous models that have been constructed for SSB in quantum statistical mechanics systems as a basis for drawing analogous conclusions about SSB in QFT. Based on an analysis of this strategy as an instance of the application of the same mathematical formalism to different domains and as (...) an instance of drawing analogies between domains, I conclude that certain structural explanations can be exported from QSM to QFT, but that causal explanations cannot. (shrink)

We critically review the recent debate between Doreen Fraser and David Wallace on the interpretation of quantum field theory, with the aim of identifying where the core of the disagreement lies. We show that, despite appearances, their conflict does not concern the existence of particles or the occurrence of unitarily inequivalent representations. Instead, the dispute ultimately turns on the very definition of what a quantum field theory is. We further illustrate the fundamental differences between the two approaches by (...) comparing them both to the Bohmian program in quantum field theory. (shrink)

I argue against the currently prevalent view that algebraic quantum field theory (AQFT) is the correct framework for philosophy of quantum field theory and that “conventional” quantum field theory (CQFT), of the sort used in mainstream particle physics, is not suitable for foundational study. In doing so, I defend that position that AQFT and CQFT should be understood as rival programs to resolve the mathematical and physical pathologies of renormalization theory, and that CQFT has succeeded in this task and AQFT (...) has failed. I also defend CQFT from recent criticisms made by Doreen Fraser. (shrink)

"Mentoring the Mentor" recreates a Freirian dialogue in a printed format. In this volume, sixteen distinguished scholars engage in a critical and thoughtful exchange with Paulo Freire. While some contributors voice appreciation for Freire's ideas and for what it means to -reinvent Freire- in a North American context, others offer sharp critiques of Freire's philosophy and, of equal importance, of the various interpretations of his work. A variety of chapters describe specific uses which have been made of Freire's ideas in (...) diverse educational contexts, from the New York City public schools to the revolutions in Guinea Bissau and Eritrea. Finally, Paulo Freire himself responds to the major issues which are raised in the volume and invites readers to share in a continuing lively dialogue about the meaning of democratic and revolutionary education. -The fundamental task of the mentor is a liberatory task. It is not to encourage the mentor's goals and aspirations and dreams to be reproduced in the mentees, the students, but to give rise to the possibility that the students become the owners of their own history. This is how I understand the need that teachers have to transcend their merely instructive task and to assume the ethical posture of a mentor who truly believes in the total autonomy, freedom, and development of those he or she mentors.- (from Chapter Sixteen, -A Response- by Paulo Freire)". (shrink)

Understanding Animal Welfare, 2nd Edition is revised and expanded to incorporate new research and developments in animal welfare. Updated with greater accessibility in mind, the reader is guided through animal welfare in its cultural and historical context, methods of study, and applications in practice and policy. Drawing examples from farm, companion, laboratory and zoo animals, the text provides an up-to-date overview of research and its applications, while also tracing how concepts and methods have evolved over time. Originally intended for scientists (...) and professionals, Understanding Animal Welfare has also found a home in undergraduate classrooms. It is now the essential text for students, practitioners, veterinarians, and researchers in animal welfare and related fields. (shrink)

Dissatisfied with the effects of schooling on children from low-income families, Doreen Grant left her post as head of a secondary school in Liverpool and turned to research for solutions to this perennial social problem. This is a popular account of her involvement with under-privileged Glaswegian parents and children, and her attempt to address the problem of underachievement from the perspective of the home rather than the educational establishment. Combining the theory of international scholars such as Brofenbrenner, Bruner, Donaldson (...) and Freire with practical experience, Doreen Grant indicates the improvements in children’s active learning when parents participate fully in the process of education. Learning Relations, first published in 1989,_ _describes the creation of a coherent learning environment in the inner city: as parents gain confidence in their personal vocation as natural educators, it becomes clear that they are not only willing but fully capable of improving their children’s chances of success. (shrink)

Democratic deliberation places the burden of self‐governance on its citizens to provide mutual justifying reasons (Gutmann & Thompson, 1996). This article concerns the limiting effect that group identity has on the efficacy of democratic deliberation for equality in education. Under conditions of a powerful majority, deliberation can be repressive and discriminatory. Issues of white flight and race‐based admissions serve to illustrate the bias of which deliberation is capable when it fails to substantively take group identity into account. As forms of (...) Gilbert's (1994) plural subjects, identity group members holding the group identity can experience agency as the freedom to believe together with members of their group. I argue that attending to how group members acquire group beliefs through trust is a reasonable accommodation of group identity in deliberation. (shrink)

Beauty is constantly lived and incorporated as a meaningful social category in Brazil and intersects with racialised and gendered ways of belonging to the Brazilian nation. In this article, I deploy ethnographic material to show how middle-class women self-identifying as black embody and experience beauty and how, through practices and discourses centred on physical appearance, they both reinforce and challenge broader social and racial inequalities in Brazil.

Currently the focus of a heated debate among indigenous peoples, human rights advocates, crop breeders, pharmaceutical companies, conservationists, social scientists, and lawyers, the proposal would allow impoverished people in biologically rich areas to realize an economic return from resources under their care. Monetary compensation could both validate their knowledge and provide them with an equitable reward for sharing it, thereby compensating biological stewardship and encouraging conservation.

Until recently, struggles for justice proceeded against the background of a taken-for-granted frame: the bounded territorial state. With that "Westphalian" picture of political space assumed by default, the scope of justice was rarely subject to open dispute. Today, however, human-rights activists and international feminists join critics of structural adjustment and the World Trade Organization in challenging the view that justice can only be a domestic relation among fellow citizens. Targeting injustices that cut across borders, they are making the scale of (...) justice an object of explicit struggle. Inspired by these efforts, Nancy Fraser asks: What is the proper frame for theorizing justice? Faced with a plurality of competing scales, how do we know which one is truly just? In exploring these questions, Fraser revises her widely discussed theory of redistribution and recognition. She introduces a third, "political" dimension of justice—representation—and elaborates a new, reflexive type of critical theory that foregrounds injustices of "misframing." Engaging with thinkers such as Jürgen Habermas, John Rawls, Michel Foucault, and Hannah Arendt, she envisions a "postwestphalian" mapping of political space that accommodates transnational solidarity, transborder publicity, and democratic frame-setting, as well as emancipatory projects that cross borders. The result is a sustained reflection on who should count with respect to what in a globalizing world. (shrink)

Doreen Bretherton; VII—‘Ought’ Implies ‘Can Say’, Proceedings of the Aristotelian Society, Volume 63, Issue 1, 1 June 1963, Pages 145–166, https://doi.org/10.10.

Doreen Bretherton; VII—‘Ought’ Implies ‘Can Say’, Proceedings of the Aristotelian Society, Volume 63, Issue 1, 1 June 1963, Pages 145–166, https://doi.org/10.10.

Doreen Bretherton; VII—‘Ought’ Implies ‘Can Say’, Proceedings of the Aristotelian Society, Volume 63, Issue 1, 1 June 1963, Pages 145–166, https://doi.org/10.10.

The new concept of embodied cognition theories has been enthusiastically studied by the cognitive sciences, by as well as such disparate disciplines as philosophy, anthropology, neuroscience, and robotics. Embodiment theory provides the framework for ongoing discussions on the linkage between “low” cognitive processes as perception and “high” cognition as language processing and comprehension, respectively. This review gives an overview along the lines of argumentation in the ongoing debate on the embodiment of language and employs an ALE meta-analysis to illustrate and (...) weigh previous findings. The collected evidence on the somatotopic activation of motor areas, abstract and concrete word processing, as well as from reported patient and timing studies emphasizes the important role of sensorimotor areas in language processing and supports the hypothesis that the motor system is activated during language comprehension. (shrink)

Angesichts der gegenwärtigen ökonomischen, ökologischen und sozialen Krisen zeichnet sich ab, dass die Wachstumsdynamik moderner Gesellschaften nicht mehr stabilisierend wirkt, sondern selbst zum Krisentreiber geworden ist. In diesem Band diskutieren die Philosophin Nancy Fraser und die Soziologen Klaus Dörre, Stephan Lessenich und Hartmut Rosa, was dies für die Gegenwart und die Zukunft der Demokratie bedeutet und welche Konzeptionen und Wege hin zu einer demokratischen Transformation vorstellbar sind. Aus ihrer demokratietheoretischen Perspektive intervenieren Viviana Asara, Banu Bargu, Ingolfur Blühdorn, Robin Celikates, (...) Lisa Herzog, Brian Milstein, Michelle Williams und Christos Zografos. (shrink)

Refuting the argument to choose between "the politics of recognition" and the "politics of redistribution," _Justice Interruptus_ integrates the best aspects of both. ********************************************************* ** What does it mean to think critically about politics at a time when inequality is increasing worldwide, when struggles for the recognition of difference are eclipsing struggles for social equality, and when we lack any credible vision of an alternative to the present order? Philosopher Nancy Fraser claims that the key is to overcome the (...) false oppositions of "postsocialist" commonsense. Refuting the view that we must choose between "the politics of recognition" and the "politics of redistribution," Fraser argues for an integrative approach that encompasses the best aspects of both. (shrink)

BackgroundInstitutions of higher learning are persistently struggling with issues of academic dishonesty such as plagiarism, despite the availability of university policies and guidelines for upholding academic integrity.MethodologyThis was a descriptive qualitative study conducted on 37 students of a Healthcare Ethics course at an Australian tertiary institution from February 2016 to October 2018. The purpose of the study was to explore the reasons for plagiarism detected the TurnitinR plagiarism checking software and extensive review of manuscripts. The interviews were conducted in private (...) rooms and in strict confidence. Thematic analysis was manually done.ResultsFour major themes namely, lack of interest; pressure of time with competing priorities; lack of understanding of the policy on academic honesty, and “the determined students” were identified. Sub themes under lack of interest were lack of preparation and effort, low self-efficacy, poor studying techniques, and convenience of internet sources. Under pressure of time, the subthemes were, misplaced priorities, procrastination, high workloads, poor planning, competing interests, and the perception of availability of time at the start of the semester. Regarding lack of understanding of the policy on academic honesty, the subthemes identified were, lake of awareness of plagiarism, lack of awareness of acceptable similarity, conflicting messages from tutors and confusion with high school learning. The determined students were those that either made all effort to reduce plagiarism but still remained high, used the another language at home other than English, had poor paraphrasing techniques or lacked resources for English language editing.ConclusionThere are varied and diverse reasons for plagiarism. There is a need to systematically reinforce and educate students on issues pertaining to academic dishonesty and their associated implications. (shrink)

Work with the Angels to Detox Your Body and Energy Detoxing with the help of your angels is a gentle way to release impurities from your body, fatigue, and addictions. Doreen Virtue and naturopath Robert Reeves teach yousimple steps to increase your energy and mental focus, banish bloating, feel and look more youthful, and regain your sense of personal power. Rid your life of physical toxins, as well as negative emotions and energies. Angel Detox guides you step-by-step on how (...) to detox your diet, lifestyle, and relationships. You'll learn how to reduce or eliminate cravings for unhealthful food and substances, feel motivated, and enjoy wellness in all areas of your life. This book also includes 7-Day Detox Plans for those wanting to quit smoking or drinking, or to flush out environmental pollution. (shrink)

Difficult relationships and challenging situations all come down to one thing: drama. In this groundbreaking book, Doreen Virtue guides you through the process of determining what your Drama Quotient is. You will learn how much you are unnecessarily tolerating and absorbing from other people and situations. Doreen highlights the difference between detaching from drama and being compassionate and helpful, and she shows you how to: Deal with relatives, friends, and co-workers who are addicted to drama Assess your own (...) level of drama addiction Stop attracting and creating negativity in your life Go on an overall Drama Detox to clear away negativity, and let your light shine through! (shrink)

Is the assumption of a fundamental distinction between particulars and universals another unsupported dogma of metaphysics? F. P. Ramsey famously rejected the particular – universal distinction but neglected to consider the many different conceptions of the distinction that have been advanced. As a contribution to the piecemeal investigation of this issue three interrelated conceptions of the particular – universal distinction are examined: universals, by contrast to particulars, are unigrade; particulars are related to universals by an asymmetric tie of exemplification; universals (...) are incomplete whereas particulars are complete. It is argued that these conceptions are wanting in several respects. Sometimes they fail to mark a significant division amongst entities. Sometimes they make substantial demands upon the shape of reality; once these demands are understood aright it is no longer obvious that the distinction merits our acceptance. The case is made via a discussion of the possibility of multigrade universals. (shrink)

This paper reports on research that suggests a new view of assessment of the practicum in teacher education. By transcending the stereotypes of ?failing? student teachers who do not achieve traditional benchmarks, this new lens highlights the complexity, diversity and inequality of experiences through listening to the voices of the student teachers and their mentors. By valuing context and focusing on progress and development rather than absolute attainment, teacher educators are challenged to reflect on their own role as mentors and (...) educators through guiding principles of practicum learning. These guiding principles of practicum learning are the result of significant observation in the practicum classroom followed by critical analysis of data provided as narrative. A more humane, trusting and respectful attitude towards assessment is suggested. (shrink)

Unruly Practices brings together a series of widely discussed essays in feminism and social theory. Read together, they constitute a sustained critical encounter with leading European and American approaches to social theory. In addition, Nancy Fraser develops a new and original socialist-feminist critical theory that overcomes many of the limitations of current alternatives. First, in a series of critical essays, she deploys philosophical and literary techniques to assess the work of Michael Foucault, the French deconstructionists, Richard Rorty, and Jürgen (...) Habermas. Then, in a group of constructive essays, she incorporates their respective strengths in a new critical theory of late-capitalist political culture. Fraser breaks new ground methodologically by integrating the previously divergent insights of poststructuralism, critical social theory, feminist theory, and pragmatism. Thematically, she deals with varied forms of dominance and subordination in modern, industrial, late-capitalist societies. These themes are integrated in an original theory of 'the politics of need interpretation.' This concept becomes the linchpin of the socialist-feminist critical theory. (shrink)

Targeting injustices that cut across borders, they are making the scale of justice an object of explicit struggle.Inspired by these efforts, Nancy Fraser asks: ...