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SUMMARY:Photon propagation in a charged Bose-Einstein condensate model
DTSTART;VALUE=DATE-TIME:20251001T180000Z
DTEND;VALUE=DATE-TIME:20251001T190000Z
DTSTAMP;VALUE=DATE-TIME:20260719T033152Z
UID:indico-event-2479@cern.ch
DESCRIPTION:We consider the propagation of photons in a model of charged s
 calar Bose-Einstein (BE) condensate. We determine the dispersion relations
  of the collective modes\, as well as the photon polarization tensor and t
 he dielectric constant in the model. Two modes correspond to the transvers
 e photon polarizations\,  with dispersion relations of the usual form for
  transverse photons in a plasma. The other two modes\, denoted as the ±mo
 des\, are combinations of the longitudinal photon and the massive scalar f
 ield. Their dispersion relations behave very differently as functions of m
 omentum. The  +mode dispersion relation increases steadily and remains gr
 eater than the momentum as the momentum increases. The dispersion relation
  of the -mode decreases in a given momentum range\, with  the group veloc
 ity being negative in that range\, while in another range it increases ste
 adily but remains smaller than the momentum\, akin to the situation in a m
 edium with an index of refraction greater than 1. We consider the non-rela
 tivistic limit of the (±) dispersion relations and discuss some aspects o
 f the results. We also determine the wavefunctions of the ± modes\, which
  are useful to obtain the corrections to the dispersion relations\, e.g.\,
  imaginary parts due to the damping effects and/or the effects of scatteri
 ng\, due to the interactions with the excitations of the system. The resul
 ts can be useful in various physical contexts that have been considered in
  the literature involving the electrodynamics of a charged scalar BE conde
 nsate.\n\nhttps://indico.nucleares.unam.mx/event/2479/
LOCATION:ICN-UNAM ( Salón de Seminarios de Gravitación y Física de Alta
 s Energías\, A225 )
URL:https://indico.nucleares.unam.mx/event/2479/
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