Dynamic effects of fluctuations in vacuum magnetic fields: radiative noise in inductance circuits.

Author(s)

Alencar José de Faria

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Instituto de Física (IF/SBI)
• Defense date: 2002-12-18

Examining board members

Humberto de Menezes Franca; Antonio Vidiella Barranco; Coraci Pereira Malta

• Advisor: Humberto de Menezes Franca

Abstract

We analyze the effects of the vacuum magnetic field (thermal and zero-point) on a macroscopic solenoid of an electric circuit. We conclude that there are voltage and current fluctuations associated to the action of the fluctuating magnetic field on the solenoid coils. This effect was denominated radiative noise. In the first published calculation, the fluctuation-dissipation theorem was used to show the possibilty of existence of the radiative noise. The proof of the radiative noise in circuits with inductance has been done by ys through the detailed calculation of the Poynting vector around the solenoid. We also present some effects due to the interaction between the macroscopic solenoid and a microscopic electric dipole, intermediated by the vacuum electromagnetic fields. The calculations were performed within the realm of the Stochastic Electrodynamics formalism. This theory is based on the Classical Electromagnetism, the Relativistic Mechanics and the hypothesis of real existence of the classical zero-point electromagnetic field. We show some of the basic results of the Stochastic Electrodynamics approach. Moreover, we introduce a descriptionos the thermal and the zero-pint voltage and current fluctuations in electric circuits, the well known Nyquist noise, aiming to achieve a better comprehension of the radiative noise effects, original prediction of this report. (AU)