Results for 'time reversal operator'

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  1. The quantum mechanical time reversal operator.Andrew Thomas Holster - unknown
    The analysis of the reversibility of quantum mechanics depends upon the choice of the time reversal operator for quantum mechanical states. The orthodox choice for the time reversal operator on QM states is known as the Wigner operator, T*, where * performs complex conjugation. The peculiarity is that this is not simply the unitary time reversal operation, but an anti-unitary operator, involving complex conjugation in addition to ordinary time (...). The alternative choice is the Racah operator, which is simply ordinary time reversal, T. Orthodox treatments hold that it is either logically or empirically necessary to adopt the Wigner operator, and the Racah operator has received little attention. The basis for this choice is analysed in detail, and it is concluded that all the conventional arguments for rejecting the Racah operator and adopting the Wigner operator are mistaken. The additional problem of whether the deterministic part of quantum mechanics should be judged to be reversible or not is also considered. The adoption of the Racah operator for time reversal appears prima facie to entail that quantum mechanics is irreversible. However, it is concluded that the real answer to question depends upon the choice of interpretation of the theory. In any case, the conventional reasons for claiming that quantum mechanics is reversible are incorrect. (shrink)
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  2. Concepts of physical directionality of time Part 2 The interpretation of the quantum mechanical time reversal operator.Andrew Thomas Holster - manuscript
    This is Part 2 of a four part paper, intended as an introduction to the key concepts and issues of time directionality for physicists and philosophers. It redresses some fundamental confusions in the subject. These need to be corrected in introductory courses for physics and philosophy of physics students. Here we analyze the quantum mechanical time reversal operator and the reversal of the deterministic Schrodinger equation. It is argued that quantum mechanics is anti-symmetric w.r.t. (...) reversal in its deterministic laws. This contradicts the orthodox analysis, found throughout the conventional literature on physical time, which claims that quantum mechanics is time symmetric (reversible), and that we must adopt the anti-unitary operator (T*) instead of the unitary time reversal operator (T) for time reversal in quantum mechanics. This is widely claimed as settled scientific fact, and large metaphysical conclusions about the symmetry of time are drawn from it. But it is an error. (shrink)
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  3. (1 other version)The incompleteness of extensional object languages of physics and time reversal. Part 2.Andrew Holster - manuscript
    This continues from Part 1. It is shown how an intensional interpretation of physics object languages can be formalised, and how a syntactic compositional time reversal operator can subsequently be defined. This is applied to solve the problems used as examples in Part 1. A proof of a general theorem that such an operator must be defineable is sketched. A number of related issues about the interpretation of theories of physics, including classical and quantum mechanics and (...)
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  4. Causation and Time Reversal.Matt Farr - 2020 - British Journal for the Philosophy of Science 71 (1):177-204.
    What would it be for a process to happen backwards in time? Would such a process involve different causal relations? It is common to understand the time-reversal invariance of a physical theory in causal terms, such that whatever can happen forwards in time can also happen backwards in time. This has led many to hold that time-reversal symmetry is incompatible with the asymmetry of cause and effect. This article critiques the causal reading of (...)
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  5. The time reversal invariance of classical electromagnetic theory: Albert versus Malament.Andrew Holster - unknown
    David Albert has recently argued that classical electromagnetic theory (EM) is not time reversal invariant (non-TRI), while David Malament rejects this argument and maintains the orthodox result, that EM is TRI. Both Albert's and Malament's arguments are analysed, and both are found wanting in certain respects. It is argued here that the result really depends on the choice of theoretical ontology choosen to interpret EM theory, and there is more than one plausible choice. Albert and Malament have choosen (...)
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  6. Time Reversal Invariance in Quantum Mechanics.Reza Moulavi Ardakani - 2017 - Dissertation, Texas Tech University
    Symmetries have a crucial role in today’s physics. In this thesis, we are mostly concerned with time reversal invariance (T-symmetry). A physical system is time reversal invariant if its underlying laws are not sensitive to the direction of time. There are various accounts of time reversal transformation resulting in different views on whether or not a given theory in physics is time reversal invariant. With a focus on quantum mechanics, I describe (...)
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  7. Maxwell's Paradox: The Metaphysics of Classical Electrodynamics and its Time Reversal Invariance.Valia Allori - 2015 - Analytica: an electronic, open-access journal for philosophy of science 1:1-19.
    In this paper, I argue that the recent discussion on the time - reversal invariance of classical electrodynamics (see (Albert 2000: ch.1), (Arntzenius 2004), (Earman 2002), (Malament 2004),(Horwich 1987: ch.3)) can be best understood assuming that the disagreement among the various authors is actually a disagreement about the metaphysics of classical electrodynamics. If so, the controversy will not be resolved until we have established which alternative is the most natural. It turns out that we have a paradox, namely (...)
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  8. Reversing the arrow of time.Bryan W. Roberts - 2022 - Cambridge: Cambridge University Press.
    'The arrow of time' refers to the curious asymmetry that distinguishes the future from the past. Reversing the Arrow of Time argues that there is an intimate link between the symmetries of 'time itself' and time reversal symmetry in physical theories, which has wide-ranging implications for both physics and its philosophy. This link helps to clarify how we can learn about the symmetries of our world, how to understand the relationship between symmetries and what is (...)
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  9. Rebellious youth and ineffective advice: A study of Vietnamese adolescents’ capability to deal with digital threats.Quan-Hoang Vuong, Quang-Loc Nguyen, Trung Tran, Hoang Phuoc-Hien Le, Viet-Phuong La, Tam-Tri Le & Minh-Hoang Nguyen - manuscript
    The digital era brings various benefits to adolescents. However, operating on the digital environment without sufficient knowledge and skills will expose them to multiple types of risks, especially in the country with low digital safety education rate like Vietnam. The current study examines factors that can contribute to cultivating adolescents’ digital resilience using the information-processing reasoning of the Mindsponge Theory. A UNESCO dataset of 1061 Vietnamese high school students was analyzed using the Bayesian Mindsponge Framework analytics. It is found that (...)
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  10. Intentionality and Referentiality. The problem of referentiality in Husserl's 'Zeitdenken'.Babu Thaliath - manuscript
    In the framework of Husserl's phenomenology, intentionality is regarded as the main feature of every act of consciousness. Our consciousness is directed towards objects immanent in it, however in a variety of epistemological functions and operations, such as sensory perception, judgment, cognition, volition, imagination, etc. Husserl uses the technical terms noesis and noema to designate the intentional acts of consciousness and their outcome in the constitution of objects in consciousness. At the same time, the persistence of a hyletic data (...)
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  11. Coalescing minds: Brain uploading-related group mind scenarios.Kaj Sotala & Harri Valpola - 2012 - International Journal of Machine Consciousness 4 (01):293-312.
    We present a hypothetical process of mind coalescence, where arti cial connections are created between two or more brains. This might simply allow for an improved form of communication. At the other extreme, it might merge the minds into one in a process that can be thought of as a reverse split-brain operation. We propose that one way mind coalescence might happen is via an exocortex, a prosthetic extension of the biological brain which integrates with the brain as seamlessly as (...)
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  12. The criterion for time symmetry of probabilistic theories and the reversibility of quantum mechanics.Andrew Thomas Holster - 2003 - New Journal of Physics 5 (130).
    Physicists routinely claim that the fundamental laws of physics are 'time symmetric' or 'time reversal invariant' or 'reversible'. In particular, it is claimed that the theory of quantum mechanics is time symmetric. But it is shown in this paper that the orthodox analysis suffers from a fatal conceptual error, because the logical criterion for judging the time symmetry of probabilistic theories has been incorrectly formulated. The correct criterion requires symmetry between future-directed laws and past-directed laws. (...)
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  13. Mad Speculation and Absolute Inhumanism: Lovecraft, Ligotti, and the Weirding of Philosophy.Ben Woodard - 2011 - Continent 1 (1):3-13.
    continent. 1.1 : 3-13. / 0/ – Introduction I want to propose, as a trajectory into the philosophically weird, an absurd theoretical claim and pursue it, or perhaps more accurately, construct it as I point to it, collecting the ground work behind me like the Perpetual Train from China Mieville's Iron Council which puts down track as it moves reclaiming it along the way. The strange trajectory is the following: Kant's critical philosophy and much of continental philosophy which has followed, (...)
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  14. This Year's Nobel Prize (2022) in Physics for Entanglement and Quantum Information: the New Revolution in Quantum Mechanics and Science.Vasil Penchev - 2023 - Philosophy of Science eJournal (Elsevier: SSRN) 18 (33):1-68.
    The paper discusses this year’s Nobel Prize in physics for experiments of entanglement “establishing the violation of Bell inequalities and pioneering quantum information science” in a much wider, including philosophical context legitimizing by the authority of the Nobel Prize a new scientific area out of “classical” quantum mechanics relevant to Pauli’s “particle” paradigm of energy conservation and thus to the Standard model obeying it. One justifies the eventual future theory of quantum gravitation as belonging to the newly established quantum information (...)
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  15. Consciousness as information system of the human body.Florin Gaiseanu - 2016 - Physics of Consciousness and Life 1 (1):14-25.
    Starting from the observation of the binary character YES/NOT of our decisions in relation to the information received from the environment, determining both our life and specie evolution by adaptation, it is defined the info-creational field and thought as an information operator on this field, allowing to describe the individual EGO as a receiver and producer information system, based on an operational and a programmed informational subsystem. Consciousness appears thus be an integrated information system which allows the adaptation to (...)
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  16.  57
    Entropy in Physics using my Universal Formula.Angelito Malicse - manuscript
    -/- 1. Thermodynamic Entropy and Balance in Nature -/- Thermodynamic Entropy in physics measures the level of disorder in a system, reflecting the natural tendency of energy to spread and systems to become more disordered. -/- Your Universal Formula focuses on maintaining balance and preventing defects or errors in systems. -/- Integration: -/- Increasing thermodynamic entropy (e.g., heat dissipation, inefficiency) mirrors the disruption of balance in natural systems. -/- Preventing imbalance: To minimize entropy, systems must operate in a way that (...)
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  17. Time flow and reversibility in a probabilistic universe.Andrew Thomas Holster - 1990 - Dissertation, Massey University
    A fundamental problem in understanding the nature of time is explaining its directionality. This 1990 PhD thesis re-examines the concepts of time flow, the physical directionality of time, and the semantics of tensed language. Several novel results are argued for that contradict the orthodox anti-realist views still dominant in the subject. Specifically, the concept of "metaphysical time flow" is supported as a valid scientific concept, and argued to be intrinsic to the directionality of objective probabilities in (...)
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    Real-Time Visibility of Dumper Load Status to Shovel Operator.J. Balaraju - 2025 - International Journal of Engineering Innovations and Management Strategies 1 (9):1-10.
    . In the high-stakes environments of mining and construction, the efficiency of loading operations is crucial for maximizing productivity and ensuring safety. Shovel operators often rely on estimates or indirect cues to gauge the load status of haul trucks, leading to challenges such as overloading, underloading , and increased operational costs. Introducing real-time visibility for dumper load status can significantly transform this process. By equipping haul trucks with sensors and data transmission technology, operators gain immediate access to accurate load (...)
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  19. What if Time Flows in Reverse? Thoughts on the Nature of Time.Thomas McGrath - manuscript
    Concepts of time as Astronomical Time, Cultural Time, and Absolute Time are defined, and an idea is developed that Absolute Time flows in reverse.
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  20. Do the Laws of Physics Forbid the Operation of Time Machines?John Earman, Chris Smeenk & Christian Wüthrich - 2009 - Synthese 169 (1):91 - 124.
    We address the question of whether it is possible to operate a time machine by manipulating matter and energy so as to manufacture closed timelike curves. This question has received a great deal of attention in the physics literature, with attempts to prove no- go theorems based on classical general relativity and various hybrid theories serving as steps along the way towards quantum gravity. Despite the effort put into these no-go theorems, there is no widely accepted definition of a (...)
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  21. The Time Flow Manifesto CHAPTER 2 TIME SYMMETRY IN PHYSICS.Andrew Holster - manuscript
    This chapter starts with a simple conventional presentation of time reversal in physics, and then returns to analyse it, rejects the conventional analysis, and establishes correct principles in their place.
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  22. Reverse Quantum Mechanics: Ontological Path.Michele Caponigro - manuscript
    This paper is essentially a quantum philosophical challenge: starting from simple assumptions, we argue about an ontological approach to quantum mechanics. In this paper, we will focus only on the assumptions. While these assumptions seems to solve the ontological aspect of theory many others epistemological problems arise. For these reasons, in order to prove these assumptions, we need to find a consistent mathematical context (i.e. time reverse problem, quantum entanglement, implications on quantum fields, Schr¨odinger cat states, the role of (...)
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  23. The Time Flow Manifesto CHAPTER 3 REVERSIBILTY IN PHYSICS.Andrew Holster - manuscript
    The conventional claims and concepts of 5* - 8* are a hang-over from the classical theory of thermodynamics – i.e. thermodynamics based on a fully deterministic micro-theory, developed in the time of Boltzmann, Loschmidt and Gibbs in the late C19th. The classical theory has well-known ‘reversibility paradoxes’ when applied to the universe as a whole. But the introduction of intrinsic probabilities in quantum mechanics, and its consequent time asymmetry, fundamentally changes the picture.
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    Empowering Power Plant Operations: A Digital Twin Platform for Real-Time Monitoring, Maintenance and Operational Efficiency.Md Ryan-Ur-Rehman - 2024 - International Journal of Engineering Innovations and Management Strategies 1 (7):1-15.
    The project centers on the development and deployment of live digital twins for power plants, designed to seamlessly integrate with existing monitoring and database systems. These digital twins act as dynamic, real-time virtual replicas of physical power plants, capturing the intricate details of plant operations, infrastructure, and environmental interactions. The primary objective is to leverage this technology to enhance the construction, operation, and maintenance phases of power plant management. By continuously receiving real-time data from various operational sensors, equipment, (...)
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  25. A Relic of a Bygone Age? Causation, Time Symmetry and the Directionality Argument.Matt Farr & Alexander Reutlinger - 2013 - Erkenntnis 78 (2):215-235.
    Bertrand Russell famously argued that causation is not part of the fundamental physical description of the world, describing the notion of cause as “a relic of a bygone age”. This paper assesses one of Russell’s arguments for this conclusion: the ‘Directionality Argument’, which holds that the time symmetry of fundamental physics is inconsistent with the time asymmetry of causation. We claim that the coherence and success of the Directionality Argument crucially depends on the proper interpretation of the ‘ (...)
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  26. Principles of physical time directionality and fallacies of the conventional philosophy.Andrew Holster - manuscript
    These are the first two chapters from a monograph (The Time Flow Manifesto, Holster, 2013-14; unpublished), defending the concepts of time directionality and time flow in physics and naturalistic metaphysics, against long-standing attacks from the ‘conventional philosophy of physical time’. This monograph sets out to disprove twelve specific “fallacies of the conventional philosophy”, stated in the first section below. These are the foundational principles of the conventional philosophy, which developed in the mid-C20th from positivist-inspired studies. The (...)
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  27. Time and irreversibility in an accelerating universe.Gustavo E. Romero & Daniela Pérez - 2011 - International Journal of Modern Physics D 20:2831-2838.
    It is a remarkable fact that all processes occurring in the observable universe are irre- versible, whereas the equations through which the fundamental laws of physics are formu- lated are invariant under time reversal. The emergence of irreversibility from the funda- mental laws has been a topic of consideration by physicists, astronomers and philosophers since Boltzmann's formulation of his famous \H" theorem. In this paper we shall discuss some aspects of this problem and its connection with the dynamics (...)
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  28. Reversing Demoralization Linked to School Bullying.Angelina Inesia-Forde - 2024 - Asian Journal of Basic Science and Research 6 (4):62-89.
    There have been 417 gun violence in schools since Columbine. In these shootings, more than 383,000 students were killed. At the time of the event, most offenders of school mass shootings were targets of school bullying, experiencing a mental health crisis, and a history of depression. Effective interventions and support that could help prevent or reduce school bullying incidents require understanding the process of demoralization and empowering social change. This paper is part of an original constructivist grounded theory study (...)
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  29. Time's Arrow and Irreversibility in Time‐Asymmetric Quantum Mechanics.Mario Castagnino, Manuel Gadella & Olimpia Lombardi - 2005 - International Studies in the Philosophy of Science 19 (3):223 – 243.
    The aim of this paper is to analyze time-asymmetric quantum mechanics with respect to the problems of irreversibility and of time's arrow. We begin with arguing that both problems are conceptually different. Then, we show that, contrary to a common opinion, the theory's ability to describe irreversible quantum processes is not a consequence of the semigroup evolution laws expressing the non-time-reversal invariance of the theory. Finally, we argue that time-asymmetric quantum mechanics, either in Prigogine's version (...)
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  30. Operator arguments revisited.Juhani Yli-Vakkuri, John Hawthorne & Peter Fritz - 2019 - Philosophical Studies 176 (11):2933-2959.
    Certain passages in Kaplan’s ‘Demonstratives’ are often taken to show that non-vacuous sentential operators associated with a certain parameter of sentential truth require a corresponding relativism concerning assertoric contents: namely, their truth values also must vary with that parameter. Thus, for example, the non-vacuity of a temporal sentential operator ‘always’ would require some of its operands to have contents that have different truth values at different times. While making no claims about Kaplan’s intentions, we provide several reconstructions of how (...)
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  31. Defending Genealogy as Conceptual Reverse-Engineering.Matthieu Queloz - 2024 - Analysis 84 (2):385-400.
    In this paper, I respond to three critical notices of The Practical Origins of Ideas: Genealogy as Conceptual Reverse-Engineering, written by Cheryl Misak, Alexander Prescott-Couch, and Paul Roth, respectively. After contrasting genealogical conceptual reverse-engineering with conceptual reverse-engineering, I discuss pragmatic genealogy’s relation to history. I argue that it would be a mistake to understand pragmatic genealogy as a fiction (or a model, or an idealization) as opposed to a form of historical explanation. That would be to rely on precisely the (...)
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  32. Merleau-Ponty and the Backward Flow of Time: The Reversibility of Temporality and the Temporality of Reversibility.Glen Mazis - 1992 - In Shaun Gallagher & Thomas Busch (eds.), Merleau-Ponty, Hermeneutics, and Postmodernism. State University of New York Press.
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  33. Time's Arrow in a Quantum Universe: On the Status of Statistical Mechanical Probabilities.Eddy Keming Chen - 2020 - In Valia Allori (ed.), Statistical Mechanics and Scientific Explanation: Determinism, Indeterminism and Laws of Nature. Singapore: World Scientific. pp. 479–515.
    In a quantum universe with a strong arrow of time, it is standard to postulate that the initial wave function started in a particular macrostate---the special low-entropy macrostate selected by the Past Hypothesis. Moreover, there is an additional postulate about statistical mechanical probabilities according to which the initial wave function is a ''typical'' choice in the macrostate. Together, they support a probabilistic version of the Second Law of Thermodynamics: typical initial wave functions will increase in entropy. Hence, there are (...)
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  34. A pressure-reversible cellular mechanism of general anesthetics capable of altering a possible mechanism of consciousness.Kunjumon Vadakkan - 2015 - Springerplus 4:1-17.
    Different anesthetics are known to modulate different types of membrane-bound receptors. Their common mechanism of action is expected to alter the mechanism for consciousness. Consciousness is hypothesized as the integral of all the units of internal sensations induced by reactivation of inter-postsynaptic membrane functional LINKs during mechanisms that lead to oscillating potentials. The thermodynamics of the spontaneous lateral curvature of lipid membranes induced by lipophilic anesthetics can lead to the formation of non-specific inter-postsynaptic membrane functional LINKs by different mechanisms. These (...)
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  35. The Time Flow Manifesto Chapter 1 Concepts of Time Direction.Andrew Holster - manuscript
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  36. Reflections on the Reversibility of Nuclear Energy Technologies.Jan Peter Bergen - 2017 - Dissertation, Delft University of Technology
    The development of nuclear energy technologies in the second half of the 20th century came with great hopes of rebuilding nations recovering from the devasta-tion of the Second World War or recently released from colonial rule. In coun-tries like France, India, the USA, Canada, Russia, and the United Kingdom, nuclear energy became the symbol of development towards a modern and technologically advanced future. However, after more than six decades of experi-ence with nuclear energy production, and in the aftermath of the (...)
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  37. A Reversal of Perspective: The Subject as Citizen under Absolute Monarchy, or the Ambiguity of Notions.Krzysztof Trzciński - 2007 - In K. Trzcinski (ed.), The State and Development in Africa and Other Regions: Studies and Essays in Honour of Professor Jan J. Milewski. Warsaw: pp. 319-332.
    Europe has never had a single definition for the term ‘citizen.’ Indeed, over the centuries the significance of this term has undergone far-reaching evolution. In different historical periods, different states, and different European languages, this term has had diverse meanings and has been used in varying contexts. The concept of ‘citizen’ has repeatedly been defined anew depending upon specific political, social, and economic conditions. At various periods, the term ‘citizen’ has related to a wider or narrower portion of a given (...)
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  38. The Meta-Reversibility Objection.Meacham Christopher - 2023 - In Barry Loewer, Brad Weslake & Eric B. Winsberg (eds.), The Probability Map of the Universe: Essays on David Albert’s _Time and Chance_. Cambridge MA: Harvard University Press.
    One popular approach to statistical mechanics understands statistical mechanical probabilities as measures of rational indifference. Naive formulations of this ``indifference approach'' face reversibility worries - while they yield the right prescriptions regarding future events, they yield the wrong prescriptions regarding past events. This paper begins by showing how the indifference approach can overcome the standard reversibility worries by appealing to the Past Hypothesis. But, the paper argues, positing a Past Hypothesis doesn't free the indifference approach from all reversibility worries. For (...)
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  39. The Silent Issue in Intel v. Sulyma: Does ERISA Section 413(2) Operate to Time-Bar Otherwise Timely Suits Challenging Subsequent Breaches of the Same Character?Rob Van Someren Greve & Paul Blankenstein - 2021 - Benefits Law Journal 34 (1):1-17.
    In its recent opinion in Intel v. Sulyma, the U.S. Supreme Court clarified what qualifies as the “actual knowledge” required to trigger ERISA’s three-year statutory period. The Court’s opinion, however, left open whether establishing “actual knowledge” by a plaintiff in one case serves to time-bar otherwise timely suits that challenge subsequent breaches of the same character. This article argues that, under the continuing fiduciary duty analysis that the Court set forth in Tibble v. Edison, such suits should not be (...)
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  40. Time and Tense.Berit Brogaard - 1997 - In Bob Hale, Crispin Wright & Alexander Miller (eds.), A Companion to the Philosophy of Language. Chichester, West Sussex, UK: Wiley-Blackwell. pp. 765-786.
    Two of the main debates in philosophy of language concerning time and tense are the debate about the semantics of the tenses in the English language and the debate over whether propositions can be transiently true or false as opposed to always being eternally true or false. The latter quarrel is also known as the "temporalism–eternalism debate." Given standard semantics, the two debates are not logically independent, as we will see. Those who believe propositions are eternally true or false (...)
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  41. Variable Binding Term Operators.John Corcoran, William Hatcher & John Herring - 1972 - Zeitschrift fur mathematische Logik und Grundlagen der Mathematik 18 (12):177-182.
    Chapin reviewed this 1972 ZEITSCHRIFT paper that proves the completeness theorem for the logic of variable-binding-term operators created by Corcoran and his student John Herring in the 1971 LOGIQUE ET ANALYSE paper in which the theorem was conjectured. This leveraging proof extends completeness of ordinary first-order logic to the extension with vbtos. Newton da Costa independently proved the same theorem about the same time using a Henkin-type proof. This 1972 paper builds on the 1971 “Notes on a Semantic Analysis (...)
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  42. The time asymmetry of quantum mechanics and concepts of physical directionality of time Part 1.Andrew Thomas Holster - manuscript
    This is Part 1 of a four part paper, intended to redress some of the most fundamental confusions in the subject of physical time directionality, and represent the concepts accurately. There are widespread fallacies in the subject that need to be corrected in introductory courses for physics students and philosophers. We start in Part 1 by analysing the time reversal symmetry of quantum probability laws. Time reversal symmetry is defined as the property of invariance under (...)
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  43.  51
    Shortest Possible World (Via Cause-Effect Role Reversal of Pre-temporal Causal Pairs).Morteza Shahram - manuscript
    Perhaps beginning of time is the common end of many causal paths (many effects as causal beginnings) and that temporal phenomena compete for somehow finding their way towards one of the beginning of the casual paths. Each casual path starts from a distinct set of parts but they all converge to the same whole at the end of their path. Such a pre-temporal causation is constitution of a whole by the sets. The temporal is de-constitution, the reverse direction, but (...)
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  44. A Connection between Minkowski and Galilean Space‐times in Quantum Mechanics.Douglas Kutach - 2010 - International Studies in the Philosophy of Science 24 (1):15 – 29.
    Relativistic quantum theories are equipped with a background Minkowski spacetime and non-relativistic quantum theories with a Galilean space-time. Traditional investigations have distinguished their distinct space-time structures and have examined ways in which relativistic theories become sufficiently like Galilean theories in a low velocity approximation or limit. A different way to look at their relationship is to see that both kinds of theories are special cases of a certain five-dimensional generalization involving no limiting procedures or approximations. When one compares (...)
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  45. Imagining stories: attitudes and operators.Neil Van Leeuwen - 2021 - Philosophical Studies 178 (2):639-664.
    This essay argues that there are theoretical benefits to keeping distinct—more pervasively than the literature has done so far—the psychological states of imagining that p versus believing that in-the-story p, when it comes to cognition of fiction and other forms of narrative. Positing both in the minds of a story’s audience helps explain the full range of reactions characteristic of story consumption. This distinction also has interesting conceptual and explanatory dimensions that haven’t been carefully observed, and the two mental state (...)
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  46.  24
    Four Quadrant Operation of DC Motor_ using PID Controller (14th edition).Darshan A. C. Tarakeshwari V. - 2025 - International Journal of Innovative Research in Science, Engineering and Technology 14 (2):1217-1221.
    This project aims to control the speed and direction of a DC motor in four quadrants: clockwise, counterclockwise, forward braking, and reverse braking. An H-bridge motor drive IC is used to switch the motor’s polarity based on user inputs via four control switches. A slide switch enables alternative directional control. A 555 timer generates PWM pulses for speed regulation, while relays manage polarity changes and braking. In regenerative braking, the motor generates reverse Ftorque for instant stopping. The four-quadrant control is (...)
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  47. A quantum mechanical analysis of time and motion in relativity theory.Diederik Aerts & Massimiliano Sassoli de Bianchi - 2024 - Theoria: Revista de Teoría, Historia y Fundamentos de la Ciencia 39 (2):165-191.
    An operational approach to quantum mechanics has been developed in the past decades in our group in Brussels. A similar approach is taken in this work, making use of the extra operational depth offered by this approach, to show that the construction of spacetime is specific to each observer. What is usually referred to as the block universe then emerges by noting that parts of the past and future are also contained in the present, but without the limitations that a (...)
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  48. A Semantics-Based Common Operational Command System for Multiagency Disaster Response.Linda Elmhadhbi, Mohamed-Hedi Karray, Bernard Archimède, J. Neil Otte & Barry Smith - 2022 - IEEE Transactions on Engineering Management 69 (6):3887 - 3901.
    Disaster response is a highly collaborative and critical process that requires the involvement of multiple emergency responders (ERs), ideally working together under a unified command, to enable a rapid and effective operational response. Following the 9/11 and 11/13 terrorist attacks and the devastation of hurricanes Katrina and Rita, it is apparent that inadequate communication and a lack of interoperability among the ERs engaged on-site can adversely affect disaster response efforts. Within this context, we present a scenario-based terrorism case study to (...)
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  49. Operational axioms for diagonalizing states.Giulio Chiribella & Carlo Maria Scandolo - 2015 - EPTCS 195:96-115.
    In quantum theory every state can be diagonalized, i.e. decomposed as a convex combination of perfectly distinguishable pure states. This elementary structure plays an ubiquitous role in quantum mechanics, quantum information theory, and quantum statistical mechanics, where it provides the foundation for the notions of majorization and entropy. A natural question then arises: can we reconstruct these notions from purely operational axioms? We address this question in the framework of general probabilistic theories, presenting a set of axioms that guarantee that (...)
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  50. Branching Time, Actuality and the Puzzle of Retrospective Determinacy.Roberto Loss - 2012 - Thought: A Journal of Philosophy 1 (1):16-25.
    The supervaluationist approach to branching time (‘SBT-theory’) appears to be threatened by the puzzle of retrospective determinacy: if yesterday I uttered the sentence ‘It will be sunny tomorrow’ and only in some worlds overlapping at the context of utterance it is sunny the next day, my utterance is to be assessed as neither true nor false even if today is indeed a sunny day. John MacFarlane (“Truth in the Garden of Forking Paths” 81) has recently criticized a promising solution (...)
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