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27
Physical versus Computational Complementarity I
, 1996
"... The dichotomy between endophysical/intrinsic and exophysical/extrinsic perception concerns the question of how a model  mathematical, logical, computational  universe is perceived from inside or from outside, [71, 65, 66, 59, 60, 68, 67]. This distinction goes back in time at least to Archimedes, ..."
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The dichotomy between endophysical/intrinsic and exophysical/extrinsic perception concerns the question of how a model  mathematical, logical, computational  universe is perceived from inside or from outside, [71, 65, 66, 59, 60, 68, 67]. This distinction goes back in time at least to Archimedes, reported to have asked for a point outside the world from which one could move the earth. An exophysical perception is realized when the system is laid out and the experimenter peeps at the relevant features without changing the system. The information flows on a oneway road: from the system to the experimenter. An endophysical perception can be realized when the experimenter is part of the system under observation. In such a case one has a twoway informational flow; measurements and entities measured are interchangeable and any attempt to distinguish between them ends up as a convention. The general conception dominating the sciences is that the physical universe is perceivable ...
A Field Guide to Recent Work on the Foundations of Statistical Mechanics
 FORTHCOMING IN DEAN RICKLES (ED.): THE ASHGATE COMPANION TO CONTEMPORARY PHILOSOPHY OF PHYSICS. LONDON: ASHGATE.
, 2008
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Criticism of Feynman's analysis of the ratchet as an engine
, 1996
"... The wellknown discussion on an engine consisting of a ratchet and a pawl in [R.P. Feynman, R.B. Leighton, and M. Sands, The Feynman Lectures on Physics, vol. 1 (Addison Wesley, Reading, Massachusetts, 1963), pp. 46.146.9] is shown to contain some misguided aspects: since the engine is simultane ..."
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Cited by 12 (2 self)
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The wellknown discussion on an engine consisting of a ratchet and a pawl in [R.P. Feynman, R.B. Leighton, and M. Sands, The Feynman Lectures on Physics, vol. 1 (Addison Wesley, Reading, Massachusetts, 1963), pp. 46.146.9] is shown to contain some misguided aspects: since the engine is simultaneously in contact with reservoirs at different temperatures, it can never work in a reversible way. As a consequence, the engine can never achieve the efficiency of a Carnot cycle, not even in the limit of zero power (infinitely slow motion), in contradiction with the conclusion reached in the Lectures. 1 Introduction Chapter 46 of The Feynman Lectures on Physics [1] contains a celebrated illustration of the impossibility of obtaining work from thermal fluctuations with an efficiency greater than that of a Carnot cycle. A careful analysis of a device that, at first sight, seems to lift a weight using the thermal energy of a gas, reveals that there exists in fact a dissipation which preve...
Zeroth and Second Laws of Thermodynamics Simultaneously Questioned in the Quantum Microworld
, 2000
"... Several models of quantum open systems are known at present to violate, according to principles of the standard quantum theory of open systems, the second law of thermodynamics. Here, a new and rather trivial model of another type is suggested describing mechanism that violates, according to the sam ..."
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Several models of quantum open systems are known at present to violate, according to principles of the standard quantum theory of open systems, the second law of thermodynamics. Here, a new and rather trivial model of another type is suggested describing mechanism that violates, according to the same principles, the zeroth and the second laws of thermodynamics simultaneously. Up to a technically minor modification, the model resembles some models already known, solved by standard means, and properly understood. Universal validity of two basic principles of thermodynamics in strictly quantum situations is thus simultaneously called in question. PACS code: 05.30.d, 05.70.a, 44.90.+c
Science At the Crossroad Between Randomness and Determinism
, 2000
"... Time and again, man's understanding of Nature is at the crossroad between total worldcomprehension and total randomness. It is suggested that not only are the preferences influenced by the theories and models of today, but also by the very personal subjective inclinations of the people inv ..."
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Time and again, man's understanding of Nature is at the crossroad between total worldcomprehension and total randomness. It is suggested that not only are the preferences influenced by the theories and models of today, but also by the very personal subjective inclinations of the people involved. The second part deals with the principle of selfconsistency and its consequences for totally deterministic systems.
Brownian motors
, 2005
"... In systems possessing a spatial or dynamical symmetry breaking, thermal Brownian motion combined with unbiased, nonequilibrium noise gives rise to a channelling of chance that can be used to exercise control over systems at the micro and even on the nanoscale. This theme is known as the “Brownian ..."
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In systems possessing a spatial or dynamical symmetry breaking, thermal Brownian motion combined with unbiased, nonequilibrium noise gives rise to a channelling of chance that can be used to exercise control over systems at the micro and even on the nanoscale. This theme is known as the “Brownian motor ” concept. The constructive role of (the generally overdamped) Brownian motion is exemplified for a noiseinduced transport of particles within various setups. We first present the working principles and characteristics with a proofofprinciple device, a diffusive temperature Brownian motor. Next, we consider very recent applications based on the phenomenon of signal mixing. The latter is particularly simple to implement experimentally in order to optimize and selectively control a rich variety of directed transport behaviors. The subtleties and also the potential for Brownian motors operating in the quantum regime are outlined and some stateoftheart applications, together with future roadways, are presented.
On the Brightness of the Thomson Lamp. A Prolegomenon to Quantum Recursion Theory
, 2009
"... Some physical aspects related to the limit operations of the Thomson lamp are discussed. Regardless of the formally unbounded and even infinite number of “steps” involved, the physical limit has an operational meaning in agreement with the Abel sums of infinite series. The formal analogies to accele ..."
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Some physical aspects related to the limit operations of the Thomson lamp are discussed. Regardless of the formally unbounded and even infinite number of “steps” involved, the physical limit has an operational meaning in agreement with the Abel sums of infinite series. The formal analogies to accelerated (hyper) computers and the recursion theoretic diagonal methods are discussed. As quantum information is not bound by the mutually exclusive states of classical bits, it allows a consistent representation of fixed point states of the diagonal operator. In an effort to reconstruct the selfcontradictory feature of diagonalization, a generalized diagonal method allowing no quantum fixed points is proposed.
The diagonalization method in quantum recursion theory
, 2009
"... As quantum parallelism allows the effective corepresentation of classical mutually exclusive states, the diagonalization method of classical recursion theory has to be modified. Quantum diagonalization involves unitary operators whose eigenvalues are different from one. ..."
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As quantum parallelism allows the effective corepresentation of classical mutually exclusive states, the diagonalization method of classical recursion theory has to be modified. Quantum diagonalization involves unitary operators whose eigenvalues are different from one.