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Dr. Simon Horsley

University of St. Andrews (UK)

Thursday, February 9th, 2012 at 03:00:00 PM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 01:43:33 PM on Wednesday, February 8th, 2012

Electromagnetic Friction

Doppler effect role in quantization of the electromagnetic field in a moving medium.

In the classical theory of radiation pressure, the electromagnetic force on a body is dependent on its relative motion. The Doppler effect introduces an extra term in the equations of motion for the body that can be understood as a kind of electromagnetic friction force. I will begin by reviewing this effect, and suggesting a way in which it could be measured using trapped atoms.

I will move on to describe the quantization of the electromagnetic field in a moving medium. Here it is found that the Doppler effect also plays an important role. Negative energy quanta appear in the description, which can be identified with energy that can be lost from the centre of mass motion of the medium (quantum friction). This is relevant to a recent debate concerning the existence of a frictional component to the Casimir force. I will finish with a discussion of the possible experimental consequences of these negative energy quanta.

[video=720 450]20120209_Seminar_horsley[/video]

For further informations, please contact Prof. Maurizio Artoni.