Abstract
The Ghirardi-Rimini-Weber (GRW) model of wave function collapse was successful in giving a solution to the measurement problem in quantum mechanics. Despite this, it lacked two desirable features—one mathematical and one physical—for a collapse model. The mathematical aspect of the GRW model that one would like to improve is its lacking of a unified description in terms of an equation for the wave function. On the physical side, the GRW model uses the first quantization language, and does not preserve the symmetry properties of indentical particles wave functions [1]. In 1990 Ghirardi, Rimini and Pearle took the desired step forward devising the Continuos Spontaneous Localisations (CSL) model [2]. They considered collapses to be driven by continuous stochastic processes (instead of having discrete collapses like in GRW), that allowed to describe the collapse dynamics by a stochastic Schrödinger equation. Moreover, the CSL model relies on the second quantization formalism, and correctly describes ensembles of identical particles.
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Ferialdi, L. (2021). Presentation of Collapse Models. In: Allori, V., Bassi, A., Dürr, D., Zanghi, N. (eds) Do Wave Functions Jump? . Fundamental Theories of Physics, vol 198. Springer, Cham. https://doi.org/10.1007/978-3-030-46777-7_4
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