Mathematical Physics

    

Negative Time is Real, Physicists Confirm

Authors: Marcello Colozzo

Recently a group of physicists measured a negative "group delay" for a pulse of light transmitted in a cold cloud of Rubidium atoms. In this paper we will study the propagation of a wave packet incident on a dispersive and dissipative medium, determining the "transit time" of the packet, which is the analogue of the group delay. We will show that if the phase of the transmitted wave is decreasing in correspondence with the value of the wavenumber that determines the peak value of the amplitude of the spectral density of the packet, the transit time is negative.

Comments: 4 Pages.

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Submission history

[v1] 2024-10-08 07:53:21

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