BEGIN:VCALENDAR VERSION:2.0 PRODID:-//wp-events-plugin.com//6.4.7.2//EN TZID:Europe/Paris X-WR-TIMEZONE:Europe/Paris BEGIN:VEVENT UID:1-248@lptms.universite-paris-saclay.fr DTSTART:20140326T140000Z DTEND:20140326T151500Z DTSTAMP:20140318T083130Z URL:https://www.lptms.universite-paris-saclay.fr/seminars/seminaire-fluide s-quantiques-du-lptms-peter-forgacs/ SUMMARY:Séminaire "Fluides quantiques" du LPTMS : Peter Forgacs - LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay - 26 Mar 14 14:00 DESCRIPTION:Plane waves as tractor beams\nPéter Forgacs (LMPT\, Universit é de Tours\, Wigner Center Budapest)\nThe subject of the talk is a simple but somewhat surprising effect\, when an incident plane wave exerts a pul ling force on the scatterer instead of the expected pushing. This effect\, which goes under the names of "tractor beam" or "negative radiation press ure"\, appears in a number of systems in 1 and 2 spatial dimensions. The u nderlying physical mechanism for the appearance of the pulling force is th e sufficiently strong scattering of the incoming wave into another propaga ting mode in the forward direction carrying away more momentum than that c ontained in the incoming wave. In such a case a "surplus" of momentum is c reated behind the scatterer leading to the eeffect. Such a negative radia tion pressure is found to appear in nonlinear field theoretical systems ( kinks\, vortices)\, also in optical (birefringent) systems\, and it may al so be relevant for more exotic objects like cosmic strings. Talk based on P. Forgács\, Á. Lukács\, T. Romanczukiewicz\, Plane waves as tractor b eams\, Phys. Rev. D88\, 125007 (2013). LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 Rue Georges Clemenceau\, Orsay\, 91405\, France GEO:48.698185;2.181768 X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=15 Rue Georges Clemenceau\, Orsay\, 91405\, France;X-APPLE-RADIUS=100;X-TITLE=LPTMS\, salle 201\, 2è me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768 END:VEVENT END:VCALENDAR