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  1.  21
    Screams for Explanation: Finetuning and Naturalness in the Foundations of Physics.Sabine Hossenfelder - 2019 - Synthese 198 (Suppl 16):3727-3745.
    We critically analyze the rationale of arguments from finetuning and naturalness in particle physics and cosmology, notably the small values of the mass of the Higgs-boson and the cosmological constant. We identify several new reasons why these arguments are not scientifically relevant. Besides laying out why the necessity to define a probability distribution renders arguments from naturalness internally contradictory, it is also explained why it is conceptually questionable to single out assumptions about dimensionless parameters from among a host of other (...)
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  2.  47
    The Case for Strong Emergence.Sabine Hossenfelder - 2019 - In Anthony Aguirre, Brendan Foster & Zeeya Merali (eds.), What is Fundamental? Springer Verlag. pp. 85-94.
    As everyone knows, physicists have proved that free will doesn’t exist. That’s because we are made of tiny particles which follow strict laws, and human behavior is really just a consequence of these particles’ laws. At least that’s what I used to think. But some years ago I stumbled over a gap in this argument. In this essay I want to tell you what made me rethink and why you should rethink, too.
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  3.  36
    The Wave Function as a True Ensemble.Jonte Hance & Sabine Hossenfelder - 2022 - Proceedings of the Royal Society 478 (2262).
    In quantum mechanics, the wavefunction predicts probabilities of possible measurement outcomes, but not which individual outcome is realised in each run of an experiment. This suggests that it describes an ensemble of states with different values of a hidden variable. Here, we analyse this idea with reference to currently known theorems and experiments. We argue that the ψ-ontic/epistemic distinction fails to properly identify ensemble interpretations and propose a more useful definition. We then show that all local ψ-ensemble interpretations which reproduce (...)
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  4.  55
    Testing Super-Deterministic Hidden Variables Theories.Sabine Hossenfelder - 2011 - Foundations of Physics 41 (9):1521-1531.
    We propose to experimentally test non-deterministic time evolution in quantum mechanics by consecutive measurements of non-commuting observables on the same prepared state. While in the standard theory the measurement outcomes are uncorrelated, in a super-deterministic hidden variables theory the measurements would be correlated. We estimate that for macroscopic experiments the correlation time is too short to have been noticed yet, but that it may be possible with a suitably designed microscopic experiment to reach a parameter range where one would expect (...)
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  5.  3
    Supermeasured: Violating Bell-Statistical Independence Without Violating Physical Statistical Independence.Jonte R. Hance, Sabine Hossenfelder & Tim N. Palmer - 2022 - Foundations of Physics 52 (4):1-15.
    Bell’s theorem is often said to imply that quantum mechanics violates local causality, and that local causality cannot be restored with a hidden-variables theory. This however is only correct if the hidden-variables theory fulfils an assumption called Statistical Independence. Violations of Statistical Independence are commonly interpreted as correlations between the measurement settings and the hidden variables. Such correlations have been discarded as “fine-tuning” or a “conspiracy”. We here point out that the common interpretation is at best physically ambiguous and at (...)
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  6.  30
    Quantum Superpositions of the Speed of Light.Sabine Hossenfelder - 2012 - Foundations of Physics 42 (11):1452-1468.
    While it has often been proposed that, fundamentally, Lorentz-invariance is not respected in a quantum theory of gravity, it has been difficult to reconcile deviations from Lorentz-invariance with quantum field theory. The most commonly used mechanisms either break Lorentz-invariance explicitly or deform it at high energies. However, the former option is very tightly constrained by experiment already, the latter generically leads to problems with locality. We show here that there exists a third way to integrate deviations from Lorentz-invariance into quantum (...)
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