Results for 'Time-reversal invariance'

999 found
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  1. What Time Reversal Invariance is and Why It Matters.John Earman - 2002 - International Studies in the Philosophy of Science 16 (3):245 – 264.
    David Albert's Time and Chance (2000) provides a fresh and interesting perspective on the problem of the direction of time. Unfortunately, the book opens with a highly non-standard exposition of time reversal invariance that distorts the subsequent discussion. The present article not only has the remedial goal of setting the record straight about the meaning of time reversal invariance, but it also aims to show how the niceties of this symmetry concept matter (...)
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  2. On the Time Reversal Invariance of Classical Electromagnetic Theory.David B. Malament - 2003 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 35 (2):295-315.
    David Albert claims that classical electromagnetic theory is not time reversal invariant. He acknowledges that all physics books say that it is, but claims they are ``simply wrong" because they rely on an incorrect account of how the time reversal operator acts on magnetic fields. On that account, electric fields are left intact by the operator, but magnetic fields are inverted. Albert sees no reason for the asymmetric treatment, and insists that neither field should be inverted. (...)
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  3. 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, (...)
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  4.  51
    Time-Reversal Invariance and Irreversibility in Time-Asymmetric Quantum Mechanics.Mario Castagnino, Manuel Gadella & Olimpia Lombardi - unknown
    The aim of this paper is to analyze the concepts of time-reversal invariance and irreversibility in the so-called 'time-asymmetric quantum mechanics'. We begin with pointing out the difference between these two concepts. On this basis, we show that irreversibility is not as tightly linked to the semigroup evolution laws of the theory -which lead to its non time-reversal invariance- as usually suggested. In turn, we argue that the irreversible evolutions described by the theory (...)
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  5.  24
    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. 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 (...)
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  7.  36
    Can the Second Law Be Compatible with Time Reversal Invariant Dynamics?Leah Henderson - 2014 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 47:90-98.
    It is commonly thought that there is some tension between the second law of thermodynam- ics and the time reversal invariance of the microdynamics. Recently, however, Jos Uffink has argued that the origin of time reversal non-invariance in thermodynamics is not in the second law. Uffink argues that the relationship between the second law and time reversal invariance depends on the formulation of the second law. He claims that a recent version (...)
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  8.  13
    A New Interpretation of Time Reversal.Sun-Tak Hwang - 1972 - Foundations of Physics 2 (4):315-326.
    A new interpretation of the time-reversal invariance principle is given. As a result, it is shown that microscopic dynamic reversibility has no basis in physics. The existing contradiction between one-way time and two-way time is reconciled. It is also pointed out that the common notion that clocks run backwards when time is reversed is wrong.
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  9. 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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  10.  50
    Quantum Mechanics, Time and Ontology.Valia Allori - 2019 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 66:145-154.
    Against what is commonly accepted in many contexts, it has been recently suggested that both deterministic and indeterministic quantum theories are not timereversal invariant, and thus time is handed in a quantum world. In this paper, I analyze these arguments and evaluate possible reactions to them. In the context of deterministic theories, first I show that this conclusion depends on the controversial assumption that the wave‐function is a physically real scalar field in configuration space. Then I argue (...)
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  11.  54
    Lanford’s Theorem and the Emergence of Irreversibility.Jos Uffink & Giovanni Valente - 2015 - Foundations of Physics 45 (4):404-438.
    It has been a longstanding problem to show how the irreversible behaviour of macroscopic systems can be reconciled with the time-reversal invariance of these same systems when considered from a microscopic point of view. A result by Lanford shows that, under certain conditions, the famous Boltzmann equation, describing the irreversible behaviour of a dilute gas, can be obtained from the time-reversal invariant Hamiltonian equations of motion for the hard spheres model. Here, we examine how and (...)
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  12.  75
    Is Time Handed in a Quantum World?Craig Callender - 2000 - Proceedings of the Aristotelian Society 100 (1):247-269.
    This paper considers the possibility that nonrelativistic quantum mechanics tells us that Nature cares about time reversal. In a classical world we have a fundamentally reversible world that appears irreversible at higher levels, e.g., the thermodynamic level. But in a quantum world we see, if I am correct, a fundamentally irreversible world that appears reversible at higher levels, e.g., the level of classical mechanics. I consider two related symmetries, time reversal invariance and what I call (...)
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  13.  61
    An Argument Against the Realistic Interpretation of the Wave Function.Carlo Rovelli - 2016 - Foundations of Physics 46 (10):1229-1237.
    Testable predictions of quantum mechanics are invariant under time reversal. But the evolution of the quantum state in time is not so, neither in the collapse nor in the no-collapse interpretations of the theory. This is a fact that challenges any realistic interpretation of the quantum state. On the other hand, this fact raises no difficulty if we interpret the quantum state as a mere calculation device, bookkeeping past real quantum events.
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  14.  61
    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 (...)
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  15.  39
    When We Do (and Do Not) Have a Classical Arrow of Time.Bryan W. Roberts - 2013 - Philosophy of Science 80 (5):1112-1124.
    I point out that some common folk wisdom about time reversal invariance in classical mechanics is strictly incorrect, by showing some explicit examples in which classical time reversal invariance fails, even among conservative systems. I then show that there is nevertheless a broad class of familiar classical systems that are time reversal invariant.
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  16.  49
    The Arrow of Time in the Equations of Motion.Fritz Rohrlich - 1998 - Foundations of Physics 28 (7):1045-1056.
    It is argued that time's arrow is present in all equations of motion. But it is absent in the point particle approximations commonly made. In particular, the Lorentz-Abraham-Dirac equation is time-reversal invariant only because it approximates the charged particle by a point. But since classical electrodynamics is valid only for finite size particles, the equations of motion for particles of finite size must be considered. Those equations are indeed found to lack time-reversal invariance, thus (...)
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  17.  93
    T Violation and the Unidirectionality of Time.Joan A. Vaccaro - 2011 - Foundations of Physics 41 (10):1569-1596.
    An increasing number of experiments at the Belle, BNL, CERN, DAΦNE and SLAC accelerators are confirming the violation of time reversal invariance (T). The violation signifies a fundamental asymmetry between the past and future and calls for a major shift in the way we think about time. Here we show that processes which violate T symmetry induce destructive interference between different paths that the universe can take through time. The interference eliminates all paths except for (...)
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  18.  66
    XII: Is Time 'Handed' in a Quantum World?Craig Callender - 2000 - Proceedings of the Aristotelian Society 100 (3):247–269.
    In a classical mechanical world, the fundamental laws of nature are reversible. The laws of nature treat the past and future as mirror images of each other. Temporally asymmetric phenomena are ultimately said to arise from initial conditions. But are the laws of nature also reversible in a quantum world? This paper argues that they are not, that time in a quantum world prefers a particular 'hand' or ordering. I argue, first, that the probabilistic algorithm used in the theory (...)
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  19.  16
    XII: Is Time ‘Handed’ In a Quantum World?Craig Callender - 2000 - Proceedings of the Aristotelian Society 100 (3):247-269.
    In a classical mechanical world, the fundamental laws of nature are reversible. The laws of nature treat the past and future as mirror images of each other. Temporally asymmetric phenomena are ultimately said to arise from initial conditions. But are the laws of nature also reversible in a quantum world? This paper argues that they are not, that time in a quantum world prefers a particular 'hand' or ordering. I argue, first, that the probabilistic algorithm used in the theory (...)
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  20. Time Reversal in Classical Electromagnetism.Frank Arntzenius & Hilary Greaves - 2009 - British Journal for the Philosophy of Science 60 (3):557-584.
    Richard Feynman has claimed that anti-particles are nothing but particles `propagating backwards in time'; that time reversing a particle state always turns it into the corresponding anti-particle state. According to standard quantum field theory textbooks this is not so: time reversal does not turn particles into anti-particles. Feynman's view is interesting because, in particular, it suggests a nonstandard, and possibly illuminating, interpretation of the CPT theorem. In this paper, we explore a classical analog of Feynman's view, (...)
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  21.  80
    Three Myths About Time Reversal in Quantum Theory.Bryan W. Roberts - 2017 - Philosophy of Science 84 (2):315-334.
    Many have suggested that the transformation standardly referred to as `time reversal' in quantum theory is not deserving of the name. I argue on the contrary that the standard definition is perfectly appropriate, and is indeed forced by basic considerations about the nature of time in the quantum formalism.
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  22.  28
    Time Reversal.Bryan W. Roberts - forthcoming - In Eleanor Knox & Alistair Wilson (eds.), Routledge Companion to the Philosophy of Physics.
    This article deals with the question of what time reversal means. It begins with a presentation of the standard account of time reversal, with plenty of examples, followed by a popular non-standard account. I argue that, in spite of recent commentary to the contrary, the standard approach to the meaning of time reversal is the only one that is philosophically and physically viable. The article concludes with a few open research problems about time (...)
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  23.  56
    Time Reversal Operations, Representations of the Lorentz Group, and the Direction of Time.Frank Arntzenius - 2004 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 35 (1):31-43.
    A theory is usually said to be time reversible if whenever a sequence of states S 1 , S 2 , S 3 is possible according to that theory, then the reverse sequence of time reversed states S 3 T , S 2 T , S 1 T is also possible according to that theory; i.e., one normally not only inverts the sequence of states, but also operates on the states with a time reversal operator T (...)
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  24.  11
    Dynamical Systems and the Direction of Time.Claudio Mazzola - 2013 - In Pierluigi Graziani, Luca Guzzardi & Massimo Sangoi (eds.), Open Problems in Philosophy of Sciences. London: College Publications. pp. 217-232.
    The problem of the direction of time is reconsidered in the light of a generalized version of the theory of abstract deterministic dynamical systems, thanks to which the mathematical model of time can be provided with an internal dynamics, solely depending on its algebraic structure. This result calls for a reinterpretation of the directional properties of physical time, which have been typically understood in a strictly topological sense, as well as for a reexamination of the theoretical meaning (...)
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  25.  41
    Time-Reversal, Irreversibility and Arrow of Time in Quantum Mechanics.M. Castagnino, M. Gadella & O. Lombardi - 2006 - Foundations of Physics 36 (3):407-426.
    The aim of this paper is to analyze time-asymmetric quantum mechanics with respect of its validity as a non time-reversal invariant, time-asymmetric theory as well as of its ability to determine an arrow of time.
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  26.  4
    Time Reversal Operations, Representations of the Lorentz Group, and the Direction of Time.Frank Arntzenius - 2003 - Studies in History and Philosophy of Modern Physics 35 (1):31-43.
    A theory is usually said to be time reversible if whenever a sequence of states S 1, S 2, S 3 is possible according to that theory, then the reverse sequence of time reversed states S 3 T, S 2 T, S 1 T is also possible according to that theory; i.e., one normally not only inverts the sequence of states, but also operates on the states with a time reversal operator T. David Albert and Paul (...)
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  27.  99
    Counterfactuals, Irreversible Laws and The Direction of Time.Terrance A. Tomkow - manuscript
    The principle of Information Conservation or Determinism is a governing assumption of physical theory. Determinism has counterfactual consequences. It entails that if the present were different, then the future would be different. But determinism is temporally symmetric: it entails that if the present were different, the past would also have to be different. This runs contrary to our commonsense intuition that what has happened in the future depends on the past in a way the past does not depend on the (...)
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  28.  17
    Time Reversal Operations, Representations of the Lorentz Group, and the Direction of Time.Frank Arntzenius - 2004 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 35 (1):31-43.
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  29. Two Views on Time Reversal.Jill North - 2008 - Philosophy of Science 75 (2):201-223.
    In a recent paper, Malament (2004) employs a time reversal transformation that differs from the standard one, without explicitly arguing for it. This is a new and important understanding of time reversal that deserves arguing for in its own right. I argue that it improves upon the standard one. Recent discussion has focused on whether velocities should undergo a time reversal operation. I address a prior question: What is the proper notion of time (...)
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  30.  22
    The Time Reversal Operator for Semigroup Evolutions.Arno Bohm & Sujeewa Wickramasekara - 1997 - Foundations of Physics 27 (7):969-993.
    A quantum theory combining an irreversible time evolution semigroup with a time reversal operator is presented.
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  31.  90
    Causation in Science.James Woodward - unknown
    This article discusses some philosophical theories of causation and their application to several areas of science. Topics addressed include regularity, counterfactual, and causal process theories of causation; the causal interpretation of structural equation models and directed graphs; independence assumptions in causal reasoning; and the role of causal concepts in physics. In connection with this last topic, this article focuses on the relationship between causal asymmetries, the time-reversal invariance of most fundamental physical laws, and the significance of differences (...)
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  32.  90
    The Metaphysics of Time Reversal: Hutchison on Classical Mechanics.Craig Callender - 1995 - British Journal for the Philosophy of Science 46 (3):331-340.
  33.  36
    Time Reversal, Information Theory, and "World-Geometry".C. T. K. Chari - 1963 - Journal of Philosophy 60 (20):579-583.
  34.  64
    The Quantum Mechanical Time Reversal Operator.Andrew 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 reversal. The alternative choice (...)
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  35. Is Classical Mechanics Time Reversal Invariant?Steven F. Savitt - 1994 - British Journal for the Philosophy of Science 45 (3):907-913.
  36.  97
    Time Reversal for Systems with Internal Symmetry.E. C. G. Sudarshan & L. C. Biedenharn - 1995 - Foundations of Physics 25 (1):139-143.
    Wigner time reversal implemented by antiunitary transformations on the wavefunctions is to be refined if we are to deal with systems with internal symmetry. The necessary refinements are formulated. Application to a number of physical problems is made with some unexpected revelations about some popular models.
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  37.  29
    Discussion: Malament on Time Reversal.Stephen Leeds - 2006 - Philosophy of Science 73 (4):448-458.
  38.  66
    Communication and Time Reversal.Murray Macbeath - 1983 - Synthese 56 (1):27 - 46.
  39.  17
    Time Reversal Symmetry and Collapse Models.D. J. Bedingham & O. J. E. Maroney - 2017 - Foundations of Physics 47 (5):670-696.
    Dynamical collapse models embody the idea of a physical collapse of the wave function in a mathematically well-defined way. They involve modifications to the standard rules of quantum theory in order to describe collapse as a physical process. This appears to introduce a time reversal asymmetry into the dynamics since the state at any given time depends on collapses in the past but not in the future. Here we challenge this conclusion by demonstrating that, subject to specified (...)
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  40.  56
    Prospects for a New Account of Time Reversal.Daniel Peterson - 2015 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 49:42-56.
    In this paper I draw the distinction between intuitive and theory-relative accounts of the time reversal symmetry and identify problems with each. I then propose an alternative to these two types of accounts that steers a middle course between them and minimizes each account’s problems. This new account of time reversal requires that, when dealing with sets of physical theories that satisfy certain constraints, we determine all of the discrete symmetries of the physical laws we are (...)
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  41.  3
    Time and Invariance.Friedel Weinert - 2008 - Conceptus: Zeitschrift Fur Philosophie 37 (92):55-82.
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  42. Time Reversal in Human Cognition: Search for a Temporal Theory of Insanity.Suchoon S. Mo - 1990 - In Richard A. Block (ed.), Cognitive Models of Psychological Time. Lawrence Erlbaum. pp. 241--254.
     
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  43. Bluff Your Way in the Second Law of Thermodynamics.Jos Uffink - 2001 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 32 (3):305-394.
    The aim of this article is to analyse the relation between the second law of thermodynamics and the so-called arrow of time. For this purpose, a number of different aspects in this arrow of time are distinguished, in particular those of time-reversal (non-)invariance and of (ir)reversibility. Next I review versions of the second law in the work of Carnot, Clausius, Kelvin, Planck, Gibbs, Caratheodory and Lieb and Yngvason, and investigate their connection with these aspects of (...)
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  44.  21
    The Born Rule and Time-Reversal Symmetry of Quantum Equations of Motion.Aleksey V. Ilyin - 2016 - Foundations of Physics 46 (7):845-851.
    It was repeatedly underlined in literature that quantum mechanics cannot be considered a closed theory if the Born Rule is postulated rather than derived from the first principles. In this work the Born Rule is derived from the time-reversal symmetry of quantum equations of motion. The derivation is based on a simple functional equation that takes into account properties of probability, as well as the linearity and time-reversal symmetry of quantum equations of motion. The derivation presented (...)
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  45.  34
    The Logic of Time Reversal.E. J. Post - 1979 - Foundations of Physics 9 (1-2):129-161.
    Active time reversal in the sense of “object reversal” and passive time reversal in the sense of a frame reversal of time are discussed separately and then together so as to bring out their dual nature. An understanding of that duality makes it unavoidable to contrast symmetry properties of matter with symmetry properties to be assigned to antimatter. Only frame reversal of time can “see” all conceivable active time reversals relevant (...)
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  46. 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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  47. Mind and Matter as Asymptotically Disjoint, Inequivalent Representations with Broken Time-Reversal Symmetry.Harald Atmanspacher - manuscript
    body. While the latter areas are discussed mainly in fields such as the philosophy of mind, cognitive Many philosophical and scientific discussions of top-.
     
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  48. Quantum Time Arrows, Semigroups and Time-Reversal in Scattering.Robert C. Bishop - 2005 - International Journal of Theoretical Physics:723-733.
    Two approaches toward the arrow of time for scattering processes have been proposed in rigged Hilbert space quantum mechanics. One, due to Arno Bohm, involves preparations and registrations in laboratory operations and results in two semigroups oriented in the forward direction of time. The other, employed by the Brussels-Austin group, is more general, involving excitations and de-excitations of systems, and apparently results in two semigroups oriented in opposite directions of time. It turns out that these two (...) arrows can be related to each other via Wigner's extensions of the spacetime symmetry group. Furthermore, their are subtle differences in causality as well as the possibilities for the existence and creation of time-reversed states depending on which time arrow is chosen. (shrink)
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  49.  7
    Fermi’s Golden Rule and the Second Law of Thermodynamics.D. Braak & J. Mannhart - 2020 - Foundations of Physics 50 (11):1509-1540.
    We present a Gedankenexperiment that leads to a violation of detailed balance if quantum mechanical transition probabilities are treated in the usual way by applying Fermi’s “golden rule”. This Gedankenexperiment introduces a collection of two-level systems that absorb and emit radiation randomly through non-reciprocal coupling to a waveguide, as realized in specific chiral quantum optical systems. The non-reciprocal coupling is modeled by a hermitean Hamiltonian and is compatible with the time-reversal invariance of unitary quantum dynamics. Surprisingly, the (...)
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  50.  5
    Asimetría Temporal y Partículas Elementales.Cristian Ariel Lopez - 2019 - Principia: An International Journal of Epistemology 23 (1):87-112.
    The aim of this article is to argue that a temporal asymmetry may be established within the framework of quantum field theory, independently of any violation of CP, and thereby T, in weak interactions, and independently of the property of time reversal invariance that its dynamical equations instantiate. Particularly, I shall argue that the temporal asymmetry can be stemmed from assessing the links between the proper group of symmetries of the theory and the ontology of the theory: (...)
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