The Feynman Lectures on Physics; Vol. I

Feynman, Richard P.; Leighton, Robert B.; Sands, Matthew; Hafner, E. M.

doi:10.1119/1.1972241

Cited by 889 publications

(909 citation statements)

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“…It is up to anyone to decide for themselves! But this is indeed the Feynman "heart-of-quantum-mechanics"-issue [13].…”

Section: Postselection Strong Intermediate Measurement (Two-particlementioning

confidence: 99%

“…A perplexing situation, maybe, but nothing but the Feynman "heart-of-QM" phenomena [13] and certainly no logical inconsistency, since different strong measurements with different subensembles/sample spaces are involved. It is worse for the weak values.…”

Section: The Three-box Problemmentioning

confidence: 99%

“…The fact that you may get different answers depending on the type of measurement you make on a quantum system is what Feynman [13] -originally for the two-slit setup -referred to when he said that it "has in it the heart of quantum mechanics" and that it "is impossible, absolutely impossible, to explain in any classical way." Griffiths [2,3] refers to it as the lack of unicity in QM: the properties to be ascribed to a quantum system depend on the way it is measured.…”

Section: Introductionmentioning

confidence: 99%

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Quantum Weak Values and Logic: An Uneasy Couple

Svensson

2017

Found Phys

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Quantum mechanical weak values of projection operators have been used to answer which-way questions, e.g. to trace which arms in a multiple Mach-Zehnder setup a particle may have traversed from a given initial to a prescribed final state. I show that this procedure might lead to logical inconsistencies in the sense that different methods used to answer composite questions, like "Has the particle traversed the way X or the way Y ?", may result in different answers depending on which methods are used to find the answer. I illustrate the problem by considering some examples: the "quantum pigeonhole" framework of Aharonov et al., the three-box problem, and Hardy's paradox. To prepare the ground for my main conclusion on the incompatibility in certain cases of weak values and logic, I study the corresponding situation for strong/projective measurements. In this case, no logical inconsistencies occur provided one is always careful in specifying exactly to which ensemble or sample space one refers. My results cast doubts on the utility of quantum weak values in treating cases like the examples mentioned.

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“…It is up to anyone to decide for themselves! But this is indeed the Feynman "heart-of-quantum-mechanics"-issue [13].…”

Section: Postselection Strong Intermediate Measurement (Two-particlementioning

confidence: 99%

Section: The Three-box Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantum Weak Values and Logic: An Uneasy Couple

Svensson

2017

Found Phys

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“…However, the entire universe did not have to be at low entropy in order for our part of the universe to have low entropy. Feynman [22] discussed the idea of whether our low entropy part of the universe could be a low entropy fluctuation, i.e. a low entropy sub-set of a larger universe that is much closer to maximum entropy:…”

Section: Anthropic Reasoning Cannot Rescue Penrose's Modelmentioning

confidence: 99%

The Entropy of the Universe and the Maximum Entropy Production Principle

Lineweaver

2013

Understanding Complex Systems

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If the universe had been born in a high entropy, equilibrium state, there would be no stars, no planets and no life. Thus, the initial low entropy of the universe is the fundamental reason why we are here. However, we have a poor understanding of why the initial entropy was low and of the relationship between gravity and entropy. We are also struggling with how to meaningfully define the maximum entropy of the universe. This is important because the entropy gap between the maximum entropy of the universe and the actual entropy of the universe is a measure of the free energy left in the universe to drive all processes. I review these entropic issues and the entropy budget of the universe. I argue that the low initial entropy of the universe could be the result of the inflationary origin of matter from unclumpable false vacuum energy. The entropy of massive black holes dominates the entropy budget of the universe. The entropy of a black hole is proportional to the square of its mass. Therefore, determining whether the Maximum Entropy Production Principle (MaxEP) applies to the entropy of the universe is equivalent to determining whether the accretion disks around black holes are maximally efficient at dumping mass onto the central black hole. In an attempt to make this question more precise, I review the magnetic angular momentum transport mechanisms of accretion disks that are responsible for increasing the masses of black holes The Entropy of the Observable UniverseStars are shining, supernovae are exploding, black holes are forming, winds on planetary surfaces are blowing dust around, and hot things like coffee mugs are cooling down. Thus, the entropy of the universe S uni , is increasing, and has been

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“…Although the form of these new statistics may appear not as clear as the other ones, it is worth observing that, as stated in ref. [19], we have neither a complete understanding nor an elementary explanation of the spin-statistics connection. In the following subsection, it is shown that we do not even have a clear phenomenological support for the symmetrization postulate.…”

Section: -Introductionmentioning

confidence: 99%

Proposed search for small violations of bose statistics in molecular spectra

Tino¹

1994

Nuov Cim D

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(ricevuto il 30 Giugno 1994; approvato il 5 Settembre 1994)Summary. --I discuss the possibility of performing a test of the symmetrization postulate for bosons by high-sensitivity spectroscopy of 1602. I show that the sensitivity required to give significant information can be easily achieved by well-developed spectroscopic methods.PACS 42.50.Wm -Optical tests of fundamental laws and forces (including QED, Bell inequalities, parity-conservation violation, relativistic effects, gravity waves).

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The Feynman Lectures on Physics; Vol. I

Cited by 889 publications

References 0 publications

Quantum Weak Values and Logic: An Uneasy Couple

Quantum Weak Values and Logic: An Uneasy Couple

The Entropy of the Universe and the Maximum Entropy Production Principle

Proposed search for small violations of bose statistics in molecular spectra

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