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- Huw Price, The Thermodynamic Arrow: Puzzles and Pseudo-Puzzles.For more than a century, physics has known of a puzzling conflict between the T- asymmetry of thermodynamic phenomena and the T-symmetry of the underlying microphysics on which these phenomena depend. This paper provides a guide to the current status of this puzzle, distinguishing the central issue from various issues with which it may be confused. It is shown that there are two competing conceptions of what is needed to resolve the puzzle of the thermodynamic asymmetry, which differ with respect to the number of distinct T-asymmetries they take to be manifest in the physical world. On the preferable one-asymmetry conception, the remaining puzzle concerns the ordered distribution of matter in the early universe. The puzzle of the thermodynamic arrow thus becomes a puzzle for cosmology.In my reading list | Discuss this article | Edit | Categorize |My bibliography
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In [Sch05a], it is argued that Boltzmann's intuition, that the psychological arrow of time is necessarily aligned with the thermodynamic arrow, is correct. Schulman gives an explicit physical mechanism for this connection, based on the brain being representable as a computer, together with certain thermodynamic properties of computational processes. [Haw94] presents similar, if briefer, arguments. The purpose of this paper is to critically examine the support for the link between thermodynamics and an arrow of time for computers. The principal arguments (...)
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Since the late nineteenth century, physics has been puzzled by the time-asymmetry of thermodynamic phenomena in the light of the apparent T-symmetry of the underlying laws of mechanics. However, a compelling solution to this puzzle has proved elusive. In part, I argue, this can be attributed to a failure to distinguish two conceptions of the problem. According to one, the main focus of our attention is a time-asymmetric lawlike generalisation. According to the other, it is a particular fact about the (...)
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| | Other links: bjps.oxfordjournals.org | Scholar | More.. I criticize two accounts of the temporal asymmetry of electromagnetic radiation - that of Huw Price, whose account centrally involves a reinterpretation of Wheeler and Feynman's infinite absorber theory, and that of Dieter Zeh. I then offer some reasons for thinking that the purported puzzle of the arrow of radiation does not present a genuine puzzle in need of a solution.
Iteration presents opposing puzzles for a theory of the imagination. The first puzzle, noted by David Lewis, is that when a person pretends to pretend, the iteration is often preserved. Let’s call this the puzzle of ‘pre- served iteration’. At the other pole, Gregory Currie has noted that very often when we pretend to pretend, the iteration does collapse. We might call this the puzzle of ‘collapsed iteration’. Somehow a theory of the imagination must be able to address these two (...)
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| Discuss this article | Edit | Categorize | My bibliography | Export citation | Other links: nottingham.ac.uk hum.utah.edu blackwell-synergy.com ingentaconnect.com | Scholar | More..
| | Other links: nottingham.ac.uk hum.utah.edu blackwell-synergy.com ingentaconnect.com | Scholar | More.. Summary: Contemporary writers often claim that chaos theory explains the thermodynamic arrow of time. This paper argues that such claims are mistaken, on two levels. First, they underestimate the difficulty of extracting asymmetric conclusions from symmetric theories. More important, however, they misunderstand the nature of the puzzle about the temporal asymmetry of thermodynamics, and simply address the wrong issue. Both of these are old mistakes, but mistakes which are poorly recognised, even today. This paper aims to lay bare the mistakes (...)
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| | Other links: usyd.edu.au | Scholar | More.. Thermodynamics is the science that describes much of the time asymmetric behavior found in the world. This entry's first task, consequently, is to show how thermodynamics treats temporally ‘directed’ behavior. It then concentrates on the following two questions. (1) What is the origin of the thermodynamic asymmetry in time? In a world possibly governed by time symmetric laws, how should we understand the time asymmetric laws of thermodynamics? (2) Does the thermodynamic time asymmetry explain the other temporal asymmetries? Does it (...)
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| | Other links: plato.stanford.edu | Scholar | More.. In many physical systems, coupling forces provide a way of carrying the energy stored in adjacent harmonic oscillators from place to place, in the form of waves. The wave equations governing such phenomena are time-symmetric: they permit the opposite processes, in which energy arrives at a point in the form of incoming concentric waves, to be lost to some external system. But these processes seem rare in nature. What explains this temporal asymmetry, and how is it related to the thermodynamic (...)
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| | Other links: philsci-archive.pitt.edu | Scholar | More.. In his famous 1979 article 'A Puzzle About Belief' Saul Kripke presents two puzzles regarding belief attribution, and he uses them to cast doubt on classical substitution arguments against the Millian view that a proper name has a 'denotation' (or reference) but no 'connotation' (or sense). In this article, I present Kripke's puzzles in what I take to be their most revealing form, discuss their relevance to the abovementioned arguments, briefly survey the ways in which philosophers have responded to these (...)
Scientific cosmology is an empirical discipline whose objects of study are the large-scale properties of the universe. In this context, it is usual to call the direction of the expansion of the universe the "cosmological arrow of time". However, there is no reason for privileging the ‘radius’ of the universe for defining the arrow of time over other geometrical properties of the space-time. Traditional discussions about the arrow of time in general involve the concept of entropy. In the cosmological context, (...)
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Dreyfus and Rubin's commentary on Division II of Being and Time raises three closely related puzzles about the possibility of authenticity: (i) how could Dasein ever choose to become authentic, (ii) how could authentic Dasein ever choose to take up any particular possibility, and (iii) how could anything matter to authentic Dasein? They argue that Heidegger has a convincing answer to the first two puzzles, but they find his answer to the third "indirect and not totally convincing" (D&R, p. 332). (...)
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