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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

Displaying all lectures given by: Richard Holman


PIRSA:19070083  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Entangled Inflationary States
Speaker(s): Richard Holman
Abstract: I’ll discuss the issue of how we can tell which quantum state might be the “right “ one for inflationary quantum fluctuations. I’ll then use a new class of states that entangle curvature fluctuations with those of a spectator scalar field and discuss potential observational signatures of suc... read more
Date: 16/07/2019 - 11:00 am

PIRSA:15010120  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Spinodal Instabilities and Super-Planckian Excursions in Natural Inflation
Speaker(s): Richard Holman
Abstract: Models such as Natural Inflation that use Pseudo-Nambu-Goldstone bosons (PNGB's) as the inflaton are attractive for many reasons. However, they typically require trans-Planckian field excursions $Delta Phi>M_{rm Pl}$, due to the need for an axion decay constant $f>M_{rm Pl}$ to have bo... read more
Date: 20/01/2015 - 11:00 am

PIRSA:11040068  ( MP4 Medium Res , MP3 , PDF ) Which Format?
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

PIRSA:10060015  ( MP4 Medium Res , MP3 , PDF ) Which Format?
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

PIRSA:07110055  ( MP4 Medium Res , 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
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