Shortcomings in the Understanding of Why Cosmological Perturbations Look Classical - General Relativity and Quantum CosmologyReportar como inadecuado




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Abstract: There is a persistent state of confusion regarding the account of the quantumorigin of the seeds of cosmological structure during inflation. In fact, arecent article C. Kiefer and D. Polarski, ArXiv: 0810.0087 astro-ph addressesthe question -Why do the Cosmological Perturbations look Classical?- and offersan answer based on unitary quantum mechanics i.e., without reference to theprojection postulate relying on the decoherence type of analysis. The argumentis, thus, implicitly assuming that decoherence offers a satisfactory solutionto the measurement problem in quantum mechanics. We will review here, why dowe, together with various other researchers in the field, consider that this isnot the case, in general, and particularly not at all in the situation at hand.In fact, as has been previously discussed A. Perez, H. Sahlmann, and D.Sudarsky, CQG 23, 2317, 2006;arXiv: gr-qc-0508100, we will argue that thecosmological situation is one where the measurement problem of quantummechanics appears in a particular exacerbated form, and that, it is this, evensharper conondrum, the one that should be addressed when dealing with theinflationary account of the origin of the seeds of cosmic structure in theearly universe.



Autor: Daniel Sudarsky

Fuente: https://arxiv.org/







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