Observation of negative impulse velocity in free space
| dc.creator | Budko, Neil V. | |
| dc.date | 2008-06-30 | |
| dc.date | 2008-07-01 | |
| dc.date.accessioned | 2026-07-07T12:27:53Z | |
| dc.date.available | 2026-07-07T12:27:53Z | |
| dc.description | Since the 1983 definition of the speed of light in vacuum as a fundamental constant with the exact value of 299792458 m/s the question remains as to what apart from the wavefront travels at that speed. It is commonly assumed that the entire wave-packet or an impulse of the electromagnetic radiation in free space does. Here it is shown, both theoretically and experimentally, that there exists a region close to the source, where, while the wave-front travels at the speed of light, the individual impulses comprising the body of the wave-packet appear to slow down and even go backwards in time. This three-dimensional near-field late-time effect may also explain some of the free-space superluminal measurements. | |
| dc.description | 4 pages, 3 figures, typo in eq.(2) corrected | |
| dc.identifier | https://arxiv.org/abs/0806.4938 | |
| dc.identifier | http://arxiv.org/abs/0806.4938 | |
| dc.identifier | Phys. Rev. Lett. 102, 020401 (2009) | |
| dc.identifier | doi:10.1103/PhysRevLett.102.020401 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/215358 | |
| dc.subject | Classical Physics | |
| dc.subject | Optics | |
| dc.title | Observation of negative impulse velocity in free space | |
| dc.type | text |