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Ruth E. Kastner [10]Ruth Kastner [6]
  1. Ruth E. Kastner (2014). Maudlin׳s Challenge Refuted: A Reply to Lewis. Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 47:15-20.
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  2. Ruth E. Kastner (2013). De Broglie Waves as the “Bridge of Becoming” Between Quantum Theory and Relativity. Foundations of Science 18 (1):1-9.
    It is hypothesized that de Broglie’s ‘matter waves’ provide a dynamical basis for Minkowski spacetime in an antisubstantivalist or relational account. The relativity of simultaneity is seen as an effect of the de Broglie oscillation together with a basic relativity postulate, while the dispersion relation from finite rest mass gives rise to the differentiation of spatial and temporal axes. Thus spacetime is seen as not fundamental, but rather as emergent from the quantum level. A result by Solov’ev which demonstrates that (...)
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  3. Ruth E. Kastner (2012). The Possibilist Transactional Interpretation and Relativity. Foundations of Physics 42 (8):1094-1113.
    A recent ontological variant of Cramer’s Transactional Interpretation, called “Possibilist Transactional Interpretation” or PTI, is extended to the relativistic domain. The present interpretation clarifies the concept of ‘absorption,’ which plays a crucial role in TI (and in PTI). In particular, in the relativistic domain, coupling amplitudes between fields are interpreted as amplitudes for the generation of confirmation waves (CW) by a potential absorber in response to offer waves (OW), whereas in the nonrelativistic context CW are taken as generated with certainty. (...)
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  4. Ruth E. Kastner (2011). Quantum Nonlocality: Not Eliminated by the Heisenberg Picture. [REVIEW] Foundations of Physics 41 (7):1137-1142.
    It is argued that the Heisenberg picture of standard quantum mechanics does not save Einstein locality as claimed in Deutsch and Hayden (Proc. R. Soc. Lond. A 456, 1759–1774, 2000). In particular, the EPR-type correlations that the authors obtain by comparing two qubits in a local manner are shown to exist before that comparison. In view of this result, the local comparison argument would appear to be ineffective in supporting their locality claim.
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  5. Ruth Kastner (2010). The Quantum Liar Experiment in Cramer's Transactional Interpretation. Studies in History and Philosophy of Science Part B 41 (2):86-92.
    Cramer's Transactional Interpretation (TI) is applied to the ``Quantum Liar Experiment'' (QLE). It is shown how some apparently paradoxical features can be explained naturally, albeit nonlocally (since TI is an explicitly nonlocal interpretation). At the same time, it is proposed that in order to preserve the elegance and economy of the interpretation, it may be necessary to consider offer and confirmation waves as propagating in a ``higher space'' of possibilities.
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  6. Ruth Kastner, Why Everettians Should Appreciate the Transactional Interpretation.
    The attractive feature of the Everett approach is its admirable spirit of approaching the quantum puzzle with a Zen-like "beginner’s mind" in order to try to envision what the pure formalism might be saying about quantum reality, even if that journey leads to a strange place. It is argued that the transactional interpretation of quantum mechanics (TI), appropriately interpreted, shares the same motivation and achieves much more, with far fewer conceptual perplexities, by taking into account heretofore overlooked features of the (...)
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  7. Ruth E. Kastner (2008). The Transactional Interpretation, Counterfactuals, and Weak Values in Quantum Theory. Studies in History and Philosophy of Science Part B 39 (4):806-818.
  8. Ruth Kastner (2006). Cramer's Transactional Interpretation and Causal Loop Problems. Synthese 150 (1):1 - 14.
    Tim Maudlin's argument for the inconsistency of Cramer's Transactional Interpretation (TI) of quantum theory has been considered in some detail by Joseph Berkovitz, who has provided a possible solution to this challenge at the cost of a significant empirical lacuna on the part of TI. The present paper proposes an alternative solution in which Maudlin's charge of inconsistency is evaded but at no cost of empirical content on the part of TI. However, Maudlin's argument is taken as ruling out Cramer's (...)
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  9. Ruth E. Kastner (2006). Cramer's Transactional Interpretation and Causal Loop Problems. Synthese 150 (1):1 - 14.
    Tim Maudlin’s argument for the inconsistency of Cramer’s Transactional Interpretation (TI) of quantum theory has been considered in some detail by Joseph Berkovitz, who has provided a possible solution to this challenge at the cost of a significant empirical lacuna on the part of TI. The present paper proposes an alternative solution in which Maudlin’s charge of inconsistency is evaded but at no cost of empirical content on the part of TI. However, Maudlin’s argument is taken as ruling out Cramer’s (...)
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  10. Peter Atterton, Katrina Bramstedt, Ruben Diaz Jr, Vaughana Feary, Michael Grosso, Amy Hannon, George T. Hole, Ruth E. Kastner, Susan Kovalinsky & Ronald Pies (2005). Contributors to Volume 1.2. Philosophical Practice 1 (2).
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  11. Ruth Kastner, The Afshar Two-Slit Experiment and Complementarity.
    A modified version of Young's experiment by Shahriar Afshar demonstrates that, prior to a ``which-way'' measurement indicating which slit a particle goes through, an interference pattern exists. It has been claimed that this result constitutes a violation of the Principle of Complementarity. This paper discusses the implications of this experiment and considers how Cramer's Transactional Interpretation accomodates the result. It is shown that the Afshar experiment is isomorphic in key respects to a a spin one-half particle prepared as ``spin up (...)
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  12. Ruth Kastner (2005). Why the Afshar Experiment Does Not Refute Complementarity. Studies in History and Philosophy of Science Part B 36 (4):649-658.
    A modified version of Young's experiment by Shahriar Afshar demonstrates that, prior to what appears to be a ``which-way'' measurement, an interference pattern exists. Afshar has claimed that this result constitutes a violation of the Principle of Complementarity. This paper discusses the implications of this experiment and considers how Cramer's Transactional Interpretation easily accomodates the result. It is also shown that the Afshar experiment is isomorphic in key respects to a spin one-half particle prepared as ``spin up along x'' and (...)
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  13. Ruth E. Kastner & Appa-Certified Philosophical Counselor (2005). First Page Preview. Philosophical Practice 1 (1).
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  14. Ruth Kastner (2004). Weak Values and Consistent Histories in Quantum Theory. Studies in History and Philosophy of Science Part B 35 (1):57-71.
    ABSTRACT: A relation is obtained between weak values of quantum observables and the consistency criterion for histories of quantum events. It is shown that ``strange'' weak values for projection operators (such as values less than zero) always correspond to inconsistent families of histories. It is argued that using the ABL rule to obtain probabilities for counterfactual measurements corresponding to those strange weak values gives inconsistent results. This problem is shown to be remedied by using the conditional weight, or pseudo-probability, obtained (...)
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  15. Ruth E. Kastner (2004). Shutters, Boxes, but No Paradoxes: Time Symmetry Puzzles in Quantum Theory. International Studies in the Philosophy of Science 18 (1):89 – 94.
    The "N-box experiment" is a much-discussed thought experiment in quantum mechanics. It is claimed by some authors that a single particle prepared in a superposition of N+1 box locations and which is subject to a final "post-selection" measurement corresponding to a different superposition can be said to have occupied "with certainty" N boxes during the intervening time. However, others have argued that under closer inspection, this surprising claim fails to hold. Aharonov and Vaidman have continued their advocacy of the claim (...)
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  16. Ruth E. Kastner (2003). The Nature of the Controversy Over Time‐Symmetric Quantum Counterfactuals. Philosophy of Science 70 (1):145-163.
    It is proposed that the recent controversy over "time-symmetric quantum counterfactuals" (TSQCs), based on the Aharonov-Bergmann-Lebowitz Rule for measurements of pre- and post-selected systems, can be clarified by taking TSQCs to be counterfactuals with a specific type of compound antecedent. In that case, inconsistency proofs such as that of Sharp and Shanks (1993) are not applicable, and the main issue becomes not whether such statements are true, but whether they are nontrivial. The latter question is addressed and answered in the (...)
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