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Why zero-point quantum noise cannot be detected at thermal equilibrium: Casimir force and zero-point contribution in the fluctuation-dissipation theorem by Reggiani, Lino; Alfinito, Eleonora is a scholarly article available to read on EtoBox.

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The role played by zero-point contribution, also called quantum noise or vacuum fluctuations, in the quantum expression of the fluctuation-dissipation theorem (FDT) is a long-standing open problem widely discussed by the physicist community since its announcement by Callen and Welton pioneer paper of 1951 [1]. From one hand, it has the drawbacks of: (i) the expectation value of its energy is infinite, (ii) it produces an ultraviolet catastrophe of the noise power spectral density and, (iii) it lacks of an experimental validation under thermal equilibrium conditions. From another hand, by imposing appropriate boundary conditions and eliminating divergences by regulation techniques, vacuum fluctuations are the source of an attractive force between opposite conducting plates, firstly predicted by Casimir in 1948 [2] and later validated experimentally with increasing accuracy. As a consequence, a quantum formulation of FDT should account for the presence of the Casimir force and of its consequences. In this letter we show that at thermal equilibrium the Casimir force should be balanced by the mechanical reaction of the physical system. As a consequence, no zero-point spectrum can be de

Author

Reggiani, Lino; Alfinito, Eleonora

Published

2016

Language

EN