Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:physics/0006034

Comment on "Observation of Superluminal Behaviors in Wave Propagation"

Murray Peshkin

Published Jun 13, 2000• 0 citations
arXivHTMLPDF

Abstract

Mugnai et al. have reported an experiment in which microwave packets appear to travel in air with a speed substantially greater than c. They calculate the group velocity of their packets and find that it agrees with their experimental result. That calculation is incorrect. A correct calculation gives a group velocity less than c. The reported experimental result cannot be reconciled with the Maxwell equations.

DOI
10.48550/arxiv.physics/0006034

Related papers

Comment on “Observation of Superluminal Behaviors in Wave Propagation”

Harry I. Ringermacher, Lawrence R. Mead

Two Comments on the Letter by D. Mugnai, A. Ranfagni, and R. Ruggeri, Phys. Rev. Lett. 84, 4830 (2000).Received 6 September 2000DOI:https://doi.org/10.1103/PhysRevLett.87.059402©2001 American Physical Society

Physical Review Letters•Jul 16, 2001•16 citations

Comment on “Observation of Superluminal Behaviors in Wave Propagation”

N. P. Bigelow, C. R. Hägen

Two Comments on the Letter by D. Mugnai, A. Ranfagni, and R. Ruggeri, Phys. Rev. Lett. 84, 4830 (2000).Points similar to those made in the following two Comments were made in papers by S. Glasgow and J. Peatross, by M. Peshkin, by L. C. Cune and M. Apostol, by W. Luis Moch\'an and V. L. Brudny, and by C. Altucci, C. de Lisio, B. Preziosi, and S. Solimeno.

Physical Review Letters•Jul 16, 2001•27 citations

SUPERLUMINAL VELOCITIES. ILLUSION OR REALITY

Pedro Pereyra, S. Pablo

We study the time-evolution of electromagnetic wave packets through optical superlattices. We follow the time evolution (described by Maxwell equations) of Gaussian packets with centroid in dieren t energy regions. The time spent by the wave packet inside an optical structure agrees extremely well with the superluminal experimental results and the phase time predictions.

•Jan 1, 2005•0 citations

On a Few Problems Related to the Negative Velocities of EM-waves Propagation

Huang Zhi-xun

In last decade,faster-than-light(superluminal) propagation of short waves,microwaves,light waves and THz waves has been studied experimentally in several countries.Many of the attempts to send pulses faster than the speed of light involved a phonomenon called negative-velocities wave propagation.In this paper,we give a bird-eye view of the theoretical and experimental research work on negative-velocities wave propagation.For example and experimentally,a light pulse propagating through the atomic vapor cell has its peak reaching the exit side before entering it,resulting in a negative transit time,and negative group velocity.So that the group velocity vg can be greater than the velocity of light c,can be infinite and even negative.In recent years,many superluminal phenomena of negative-velocities have been discovered in experiments and observations,so we say it is a new frontier in sciences research.

现代传播：中国传媒大学学报•Jan 1, 2007•0 citations

Observation of Superluminal Behaviors in Wave Propagation

Daniela Mugnai, Anedio Ranfagni, R. Ruggeri

The possibility of observing superluminal behavior in the propagation of localized microwaves over distances of tens of wavelengths is experimentally demonstrated. These types of waves, better than the evanescent modes of tunneling, can contribute to answering the question on the luminal limit of the signal velocity.

Physical Review Letters•May 22, 2000•328 citations

Fast Light and Superluminal Images via Four-Wave Mixing

Ryan T. Glasser, Ulrich Vogl, Paul D. Lett

Manipulating the group velocity of light has resulted in many advances, including slowing light to a car’s pace, stopping light and even forcing pulses to propagate faster than the speed of light in a vacuum. While the group velocity is equal to or less than the speed of light in a vacuum (c) when propagating through a medium exhibiting normal dispersion, anomalous dispersion allows the group velocity to be greater than c, or even negative. Strangely, the peak of a pulse propagating with a negative group velocity through a medium appears to exit the medium before entering it. This is a result of interference from spectral components of a pulse propagating with different phase velocities in the medium.

Optics and Photonics News•Dec 1, 2012•0 citations
Mugnai et al. have reported an experiment in which microwave packets appear to travel in air with a speed substantially greater than c. They calculate the group velocity of their packets and find that it agrees with their experimental result. That calculation is incorrect. A correct calculation gives a group velocity less than c. The reported experimental result cannot be reconciled with the Maxwell equations.
In last decade,faster-than-light(superluminal) propagation of short waves,microwaves,light waves and THz waves has been studied experimentally in several countries.Many of the attempts to send pulses faster than the speed of light involved a phonomenon called negative-velocities wave propagation.In this paper,we give a bird-eye view of the theoretical and experimental research work on negative-velocities wave propagation.For example and experimentally,a light pulse propagating through the atomic vapor cell has its peak reaching the exit side before entering it,resulting in a negative transit time,and negative group velocity.So that the group velocity vg can be greater than the velocity of light c,can be infinite and even negative.In recent years,many superluminal phenomena of negative-velocities have been discovered in experiments and observations,so we say it is a new frontier in sciences research.
Manipulating the group velocity of light has resulted in many advances, including slowing light to a car’s pace, stopping light and even forcing pulses to propagate faster than the speed of light in a vacuum. While the group velocity is equal to or less than the speed of light in a vacuum (c) when propagating through a medium exhibiting normal dispersion, anomalous dispersion allows the group velocity to be greater than c, or even negative. Strangely, the peak of a pulse propagating with a negative group velocity through a medium appears to exit the medium before entering it. This is a result of interference from spectral components of a pulse propagating with different phase velocities in the medium.