PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE
 | PIRSA:10100071
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Infrared instability of massless scalars in De Sitter space-time. Speaker(s): Alexander Dolgov
Abstract: Vacuum expectation value of the square of the quantum field operator of massless or light scalar field is calculated in the De Sitter space-time. The suggested method of calculation is different from the standard one used in the 80th. The calculations are heavily based on the De Sitter covarinace of... read more
Date: 28/10/2010 - 4:00 pm
Collection: IR issues and loops in de Sitter space - 2010
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 | PIRSA:09090105
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Screening effects in plasma with charged Bose condensate Speaker(s): Alexander Dolgov
Abstract: The screening of electric charge in plasma with Bose condensate of a charged scalar field is calculated. In all previous calculations before 2009 the effects of Bose condensation have not been considered. Due to the condensate the time-time component of the photon polarization tensor in addition to ... read more
Date: 28/09/2009 - 2:00 pm
Series: Particle Physics
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 | PIRSA:05100010
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The problem of vacuum energy from a particle physics perspective Speaker(s): Alexander Dolgov
Abstract: The problem of vacuum energy is reviewed. The observational evidence in favor of a non-zero cosmological constant is described. I then discuss several possible explanations for how a theoretically natural huge value of vacuum energy could be adjusted down to the unnaturally tiny but observed value.
Date: 05/10/2005 - 2:00 pm
Series: Colloquium
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