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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

PIRSA:C08027 - Young Researchers Conference 2008PODCAST Subscribe to podcast

This conference provides an opportunity for invited young physicists to experience the dynamic environment and research opportunities offered to Postdoctoral Fellows pursuing their research careers at Perimeter Institute.

Organizer(s): Lee Smolin   Niayesh Afshordi   Michele Mosca   Ashwin Nayak   Maxim Pospelov   Neil Turok   Alex Buchel   Robert Spekkens  

Collection URL: http://pirsa.org/C08027

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Story of a & c
Speaker(s): Yuji Tachikawa
Abstract: In two dimensional CFTs the Zamolodchikov's c-theorem is fundamental in that it shows that the number of degrees of freedom decreases along the renormalization group flow. I will give a short history of and discuss recent developments in the quest to find its four-dimensional analogue using the cent... read more
Date: 11/12/2008 - 2:20 pm

Four dimensional dynamics of string compactifications
Speaker(s): Gonzalo Torroba
Abstract: We report on recent progress in understanding string compactifications to four dimensions, preserving minimal supersymmetry. We develop a general formalism to construct the kinetic terms of the low energy degrees of freedom. At strong warping, new light Kaluza-Klein modes appear, which change the ef... read more
Date: 11/12/2008 - 3:00 pm

Tachyon Mediated Non-Gaussianity
Speaker(s): Louis Leblond
Abstract: I will discuss the various sources of non-Gaussianity (NG) in a class of multi-field models of inflation. I will show that there is both an intrinsic and a local contribution to the NG although they both have the same shape. It is also possible in this class of models that the dominant part to the 3... read more
Date: 11/12/2008 - 4:00 pm

Asymptotic Expansion of the N=4 Dyon Degeneracy
Speaker(s): Nabamita Banerjee
Abstract: We study various aspects of power suppressed as well as exponentially suppressed corrections in the asymptotic expansion of the degeneracy of quarter BPS dyons in N=4 supersymmetric string theories. In particular we explicitly calculate the power suppressed corrections up to second order and the fir... read more
Date: 11/12/2008 - 4:40 pm

LQG spinfoam models: basic ideas and motivations
Speaker(s): Jonathan Engle
Abstract: We give an overview of what we have called the 'LQG spinfoam models,' that provide a spinfoam dynamics for LQG, for arbitrary values of the Barbero-Immirzi parameter in both Lorentzian and Euclidean signatures. The key motivation behind these models was to modify the Barrett-Crane model, by handling... read more
Date: 12/12/2008 - 9:30 am

Loop quantum gravity vertex for spin foam gravity
Speaker(s): Roberto Pereira
Abstract: New spin foam models for gravity have been recently proposed to deal with the shortcomings of the Barrett-Crane model. In particular, they draw a closer connection between the Loop Quantum Gravity and the Spin Foam approaches to non perturbative quantum gravity. In this talk, I will present the cons... read more
Date: 12/12/2008 - 10:10 am

The impossibility of partially local hidden variable models for quantum theory and the relation to cryptography
Speaker(s): Roger Colbeck
Abstract: More than 40 years ago, Bell ruled out completely local hidden variable models as an explanation for quantum correlations. However, a new type of hidden variable model has recently been brought to light by the work of Leggett. Such a model has both local and non-local parts. Roughly speaking, having... read more
Date: 12/12/2008 - 11:50 am

Admissible transformations of quantum networks and their applications in quantum information processing
Speaker(s): Giulio Chiribella
Abstract: Quantum operations are known to be the most general state transformations that can be applied to parts of compound systems compatibly with the probabilistic structure of quantum mechanics. What about the most general transformations of quantum operations? It turns out that any such general transform... read more
Date: 12/12/2008 - 2:00 pm

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