Abstract
Collapse models represent one of the possible solutions to the measurement problem. These models modify the Schrödinger dynamics with nonlinear and stochastic terms, which guarantee the localization in space of the wave function avoiding macroscopic superpositions, like that described in Schrödinger’s cat paradox. The Ghirardi–Rimini–Weber (GRW) and the Continuous Spontaneous Localization (CSL) models are the most studied among the collapse models. Here, we briefly summarize the main features of these models and the advances in their experimental investigation.
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Notes
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- 2.
In their original formulation [2], Ghirardi, Rimini, and Weber considered the possibility that different particles can have different collapse rate \(\lambda _i\). However, this is not required and in literature only one \(\lambda \), representing the collapse rate for a nucleon, is considered. For composite objects, the corresponding total collapse rate can be calculated through the amplification mechanism discussed below.
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Acknowledgements
MC acknowledges the financial support from the H2020 FET Project TEQ (grant n.766900) and the support from the COST Action QTSpace (CA15220), INFN and the University of Trieste. SD acknowledges the financial support from the Fetzer Franklin Foundation and the support from the COST Action QTSpace (CA15220) and the Frankfurt Institute for Advanced Studies (FIAS). Both the authors are grateful for the support offered by the WE-Heraeus-Stiftung for the WE-Heraeus-Seminars entitled “Advances in open systems and fundamental tests of quantum mechanics”.
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Carlesso, M., Donadi, S. (2019). Collapse Models: Main Properties and the State of Art of the Experimental Tests. In: Vacchini, B., Breuer, HP., Bassi, A. (eds) Advances in Open Systems and Fundamental Tests of Quantum Mechanics. Springer Proceedings in Physics, vol 237. Springer, Cham. https://doi.org/10.1007/978-3-030-31146-9_1
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