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Klaas Landsman
Radboud University Nijmegen
  1. Constraints on Determinism: Bell Versus Conway–Kochen.Eric Cator & Klaas Landsman - 2014 - Foundations of Physics 44 (7):781-791.
    Bell’s Theorem from Physics 36:1–28 (1964) and the (Strong) Free Will Theorem of Conway and Kochen from Notices AMS 56:226–232 (2009) both exclude deterministic hidden variable theories (or, in modern parlance, ‘ontological models’) that are compatible with some small fragment of quantum mechanics, admit ‘free’ settings of the archetypal Alice and Bob experiment, and satisfy a locality condition akin to parameter independence. We clarify the relationship between these theorems by giving reformulations of both that exactly pinpoint their resemblance and their (...)
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    Randomness? What Randomness?Klaas Landsman - 2020 - Foundations of Physics 50 (2):61-104.
    This is a review of the issue of randomness in quantum mechanics, with special emphasis on its ambiguity; for example, randomness has different antipodal relationships to determinism, computability, and compressibility. Following a philosophical discussion of randomness in general, I argue that deterministic interpretations of quantum mechanics are strictly speaking incompatible with the Born rule. I also stress the role of outliers, i.e. measurement outcomes that are not 1-random. Although these occur with low probability, their very existence implies that the no-signaling (...)
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  3. The Principle of General Tovariance.Chris Heunen, Klaas Landsman & Bas Spitters - unknown
    We tentatively propose two guiding principles for the construction of theories of physics, which should be satisfied by a possible future theory of quantum gravity. These principles are inspired by those that led Einstein to his theory of general relativity, viz. his principle of general covariance and his equivalence principle, as well as by the two mysterious dogmas of Bohr's interpretation of quantum mechanics, i.e. his doctrine of classical concepts and his principle of complementarity. An appropriate mathematical language for combining (...)
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  4. Does Physics Make Us Free?: J.T. Ismael: How Physics Makes Us Free. New York: Oxford University Press, 2016, 288 Pp, $29.95 HB. [REVIEW]Natalja Deng & Klaas Landsman - 2017 - Metascience 26 (1):127-130.
    This is a joint review of Jenann Ismael's 'How physics makes us free' (OUP).
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    Singularities, Black Holes, and Cosmic Censorship: A Tribute to Roger Penrose. [REVIEW]Klaas Landsman - 2021 - Foundations of Physics 51 (2):1-38.
    In the light of his recent Nobel Prize, this pedagogical paper draws attention to a fundamental tension that drove Penrose’s work on general relativity. His 1965 singularity theorem does not in fact imply the existence of black holes. Similarly, his versatile definition of a singular space–time does not match the generally accepted definition of a black hole. To overcome this, Penrose launched his cosmic censorship conjecture, whose evolution we discuss. In particular, we review both his own formulation and its later, (...)
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