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SUMMARY:Bose-Einstein condensation of photons in an ideal atomic gas
DTSTART:20130523T130000
DTEND:20130523T140000
DTSTAMP:20260916T043952Z
UID:b0d9661059f584677bff7283dc88538abf3e727306fcf1a57bf9eb4e
CATEGORIES:Conferences - Seminars
DESCRIPTION:Mr. Alex Kruchkov\nWe study peculiarities of Bose-Einstein con
 densation of photons that are in thermodynamic equilibrium with atoms of n
 on-interacting gases. General equations of the thermodynamic equilibrium o
 f the system under study were obtained. Solutions of these equations in th
 e case of high temperatures\, when the atomic components of the system can
  be considered as non-degenerated ideal gases of atoms\, and photonic comp
 onent can form a state with Bose condensate\, were studied. Equation for t
 ransition temperature and expression for the density of condensed photons 
 in considered system were derived. Analytical solutions of the equation fo
 r the critical temperature in a number of particular cases were considered
 . The existence of two regimes of Bose condensation of photons\, which dif
 fer significantly in nature of transition temperature dependence on the to
 tal density of pumped into the system photons\, was revealed. In one case\
 , this dependence is a traditional fractional-power law\, and in another o
 ne it is the logarithmic law. Applying numerical methods\, we determine bo
 undaries of existence and implementation conditions for different regimes 
 of condensation depending on the physical parameters of the system under s
 tudy. We also show that for a large range of physical systems that are in 
 equilibrium with photons (from ultracold gases of alkali metals to certain
  types of ideal plasma)\, the condensation of photons should occur accordi
 ng to the logarithmic regime.
LOCATION:PH L1 505 http://plan.epfl.ch/?room=PH%20L1%20505
STATUS:CONFIRMED
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