According to the prevailing sentiment, changing the past is logically impossible. The prevailing sentiment is wrong. In this paper, I argue that the claim that changing the past entails a contradiction ultimately rests upon an empirical assumption, and so the conclusion that changing the past is logically impossible is to be resisted. I then present and discuss a model of time which drops the empirical assumption and coherently models changing the past. Finally, I defend the model, and changing the past, (...) against objections. (shrink)

Quantum mechanics, which describes the behavior of subatomic particles, seems to challenge common sense. Waves behave like particles; particles behave like waves. You can tell where a particle is, but not how fast it is moving--or vice versa. An electron faced with two tiny holes will travel through both at the same time, rather than one or the other. And then there is the enigma of creation ex nihilo, in which small particles appear with their so-called antiparticles, only to disappear (...) the next instant in a tiny puff of energy. Since its inception, physicists and philosophers have struggled to work out the meaning of quantum mechanics. Some, like Niels Bohr, have responded to quantum mechanics' mysteries by replacing notions of position and velocity with probabilities. Others, like Einstein and Penrose, have disagreed and think that the entire puzzle reflects not a fundamental principle of nature but our own ignorance of basic scientific processes. Sneaking a Look at God's Cards offers the general reader a deep and real understanding of the problems inherent to the interpretation of quantum mechanics, from its inception to the present. The book presents a balanced overview of current debates and explores how the theory of quantum mechanics plays itself out in the real world. Written from the perspective of a leading European physicist, the book looks extensively at ideas from both sides of the Atlantic and also considers what philosophers have contributed to the scientific discussion of this field. Sneaking a Look at God's Cards sets out what we know about the endlessly fascinating quantum world, how we came to this understanding, where we disagree, and where we are heading in our quest to comprehend the seemingly incomprehensible. (shrink)

We analyse a recent paper in which an alleged devastating criticism of the so called GRW proposal to account for the objectification of the properties of macroscopic systems has been presented and we show that the author has not taken into account the precise implications of the GRW theory. This fact makes his conclusions basically wrong. We also perform a survey of measurement theory aimed to focus better on the physical and the conceptual aspects of the so-called macro-objectification problem.

G. C. J. Midgley; XIV—Linguistic Rules, Proceedings of the Aristotelian Society, Volume 59, Issue 1, 1 June 1959, Pages 271–290, https://doi.org/10.1093/aristot.

In lieu of an abstract, here is a brief excerpt of the content:154. 1 HUME AND THE GOD-HYPOTHESIS Interpretation of Hume's Dialogues Concerning Natural Religion has always been contentious. While some think it obvious that Philo is Hume's spokesman, others think it is Cleanthes. Whether or not Philo is Hume's spokesman, he certainly produces the better argument. Nonetheless, that argument is flawed by an assumption which I doubt Hume ever questioned. I want to consider that assumption, but want to make (...) it clear that it is not my intention to defend Cleanthes' position. The second thing I want to do in this paper, which I have not seen done elsewhere, is to connect Hume's arguments in the Dialogues with his anthropological account of religiosity. Perhaps the least contentious thing about the Dialogues is that Demea's a priori position is not taken too seriously, nor is much time spent on the first cause argument, so important from Aristotle to Leibniz. What is given serious attention is what might be described as the 'God-hypothesis', which is more or less the Argument from Design. Philo rejects the argument for reasons we shall review below, but makes a concession. The concession is basically that it is intelligible to contend that the cause or causes of order in the world bear some resemblance to human intelligence. The catch, which is the point driven home against Cleanthes, is that, while intelligible, the idea is utterly pointless. Philo says: If the whole of Natural Theology... resolves itself into one simple...proposition, That_ the cause or causes of order in the universe probably bear some remote analogy to human intelligence : If this proposition be not capable of extension...If it affords no inference that affects human life... if the analogy... can be carried no farther... (203) then it is without point. Hume is willing to let the theist have his vague analogy, for it serves no point. In fact, the theist cannot 155. win, for to the extent that the God-hypothesis might have explanatory power, it approaches the status of an empirical hypothesis, and as such loses theological import. The Dialogues should be devastating, yet seem to miss the mark. Suppose we look a bit more closely at what is going on. The position Cleanthes elaborates is an hypothesis to the effect that the world exhibits order and that that order is best explained by the postulation of an orderer. Cleanthes' moves are a bit more complicated, as we shall see in a moment, but this is the essential point. The hypothesis is conceived by Hume as either competing with or completing science. In the Enquiry we read that The religious hypothesis...must be considered only as a particular method of accounting for the visible phenomena of the universe : but no.just reasoner will ever presume to infer from it any single fact, and alter or add to the phenomena, in any single particular. (237) The passage is virtually a summary of Philo's thesis. There can be no move from an inferred cause to anything further in terms of either facts or properties. Cleanthes may be grudgingly granted his causal supposition, but he is not allowed to use it. Again: And what can you say more, allowing all your suppositions and reasonings?... (0)ur conduct and deportment in life is still the same... You persist in imagining, that, if we grant that divine existence,...you may safely infer consequences from it... You seem not to remember, that all your reasonings... can only be drawn from effects to causes... (238) The crucial failure is that All the philosophy...and all the religion... will never be able to carry us beyond the usual cause of experience, or give us measures of conduct and behaviour different from those which are furnished by reflections on common life. (244) God, as putative cause simply makes no difference, so long as we conform to the standards of rational thought. 156. It is important to be clear that what is being rejected is God as "a fruitful rival to scientific explanatory notions, such as gravity". The rejection of God as explanatory principle turns on the illegitimacy of Cleanthes' moves. As Peter Jones puts it, Cleanthes makes two inferences... (shrink)

Objectives: To analyse legislation and medical professional positions concerning the doctor’s role in assisted dying in western Europe, and to discuss their implications for doctors.Method: This paper is based on country-specific reports by experts from European countries where assisted dying is legalised , or openly practiced , or where it is illegal .Results: Laws on assisted dying in The Netherlands and Belgium are restricted to doctors. In principle, assisted suicide is not illegal in either Germany or Switzerland, but a doctor’s (...) participation in Germany would violate the code of professional medical conduct and might contravene of a doctor’s legal duty to save life. The Assisted Dying for the Terminally Ill Bill proposed in the UK in 2005 focused on doctors, whereas the Proposal on Assisted Dying of the Norwegian Penal Code Commission minority in 2002 did not.Professional medical organisations in all these countries except The Netherlands maintain the position that medical assistance in dying conflicts with the basic role of doctors. However, in Belgium and Switzerland, and for a time in the UK, these organisations dropped their opposition to new legislation. Today, they regard the issue as primarily a matter for society and politics. This “neutral” stance differs from the official position of the Royal Dutch Medical Association which has played a key role in developing the Dutch practice of euthanasia as a “medical end-of-life decision” since the 1970s.Conclusion: A society moving towards an open approach to assisted dying should carefully identify tasks to assign exclusively to medical doctors, and distinguish those possibly better performed by other professions. (shrink)

In previous work I argued against (i) the likelihood of finding a theoretically sound foundation for the linked/convergent distinction and (ii) the utility of the distinction even if a sound theoretical basis could be found. Here I subject Douglas Walton’s comprehensive discussion of the linked/convergent distinction found in Argument Structure: A Pragmatic Theory to careful scrutiny and argue that at best Walton’s theory remains incomplete and that attempts to fill out the details will run afoul of at least one of (...) the problems adduced above—i.e., result in either a theoretically unsound distinction or a theoretically sound, but unnecessary distinction. (shrink)

We apply the distinction between parameter independence and outcome independence to the linear and nonlinear models of a recent nonrelativistic theory of continuous state vector reduction. We show that in the nonlinear model there is a set of realizations of the stochastic process that drives the state vector reduction for which parameter independence is violated for parallel spin components in the EPR-Bohm setup. Such a set has an appreciable probability of occurrence (≈ 1/2). On the other hand, the linear model (...) exhibits only extremely small parameter dependence effects. We investigate some specific features of the models and we recall that, as has been pointed out recently, if one wants to be able to speak of definite outcomes (or equivalently of possessed objective elements of reality) at finite times, one has to slightly change the criteria for their attribution to physical systems. The concluding section is devoted to a detailed discussion of the difficulties which one meets when one tries to take, as a starting point for the formulation of a relativistic theory, a nonrelativistic scheme which exhibits parameter dependence. Here we derive a theorem which identifies the precise sense in which the occurrence of parameter dependence forbids a genuinely relativistic generalization. Finally we show how the appreciable parameter dependence of the nonlinear model gives rise to problems with relativity, while the extremely weak parameter dependence of the linear model does not give rise to any difficulty, provided one takes into account the appropriate criteria for the attribution of definite outcomes. (shrink)

Many defenders of the possibility of time travel into the past also hold that such time travel places no restrictions on what said time travelers can do. Some hold that it places at least a few restrictions on what time travelers can do. In attempting to resolve this dispute, I reached a contrary conclusion. Time travelers to the past cannot do other than what they in fact do. Using a very weak notion of can, I shall argue that the correspondingly (...) strong cannot do otherwise applies in the case of backwards time travel. I defend this result from objections. (shrink)

G. C. J. Midgley; XIV—Linguistic Rules, Proceedings of the Aristotelian Society, Volume 59, Issue 1, 1 June 1959, Pages 271–290, https://doi.org/10.1093/aristot.