PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE
 | PIRSA:11040068
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On the Perturbative Stability of Quantum Field Theories in de Sitter Space Speaker(s): Richard Holman
Abstract: We use a field theoretic generalization of the Wigner-Weisskopf method to study the stability of the Bunch-Davies vacuum state for a massless, conformally coupled interacting test field in de Sitter space. A simple example of the impact of vacuum decay upon a non-gaussian correlation is discussed. S... read more
Date: 20/04/2011 - 11:00 am
Series: Cosmology & Gravitation
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 | PIRSA:10060015
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Infrared Issues in de Sitter Space: Secular Growth of Fluctuations and the Breakdown of the Semiclassical Approximation. Speaker(s): Richard Holman
Abstract: I'll discuss some work done in collaboration with Cliff Burgess, Louis Leblond and Sarah Shandera on the significance of the IR divergences in de Sitter space. First, I'll talk about how large fluctuations at long distances can induce the failure of the loop expansion for interacting field theories ... read more
Date: 16/06/2010 - 10:30 am
Collection: Cosmological Frontiers in Fundamental Physics
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 | PIRSA:07110055
( Flash Presentation , Windows Presentation , Windows Video File , MP3 , PDF) Which Format?
Imprinting Short-Distance Physics on Long Distance Observables: Can this be consistent? Speaker(s): Richard Holman
Abstract: We use the example of inflationary physics to discuss the possibility that short distance physics might be imprinted on long-distance observables. In particular, we focus on issues involving decoupling in field theory.
Date: 08/11/2007 - 4:15 pm
Collection: Experimental Search for Quantum Gravity
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