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# Video Library

Since 2002 Perimeter Institute has been recording seminars, conference talks, and public outreach events using video cameras installed in our lecture theatres.  Perimeter now has 7 formal presentation spaces for its many scientific conferences, seminars, workshops and educational outreach activities, all with advanced audio-visual technical capabilities.  Recordings of events in these areas are all available On-Demand from this Video Library and on Perimeter Institute Recorded Seminar Archive (PIRSA)PIRSA is a permanent, free, searchable, and citable archive of recorded seminars from relevant bodies in physics. This resource has been partially modelled after Cornell University's arXiv.org.

## 1-loop diagram in AdS space and the random disorder problem

Friday Nov 26, 2010
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AdS/CFT has proven itself a powerful tool in extending our understanding of strongly coupled quantum theories. While studies of AdS/CFT have predominantly focused on tree level calculations, there has been growing interest in the loop effect recently. We studied the 1-loop correction to the gauge boundary-to-boundary correlator due to its coupling to a complex scalar field. In this talk, I would outline our main results, explain the Cutkosky rule in AdS space, and discuss an extra divergence we found in both real and imaginary part of the loop integral.

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## Mathematical Physics (PHYS 624) - Lecture 5

Friday Nov 26, 2010
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## Conformal Field Theory (PHYS 609) - Lecture 5

Friday Nov 26, 2010
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## Mathematical Physics (PHYS 624) - Lecture 4

Thursday Nov 25, 2010
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## Conformal Field Theory (PHYS 609) - Lecture 4

Thursday Nov 25, 2010
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## From low-distortion embeddings to information locking

Wednesday Nov 24, 2010
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I'll describe a connection between uncertainty relations, information locking and low-distortion embeddings of L2 into L1. Exploiting this connection leads to the first explicit construction of entropic uncertainty relations for a number of measurements that is polylogarithmic in the dimension d while achieving an average measurement entropy of (1-e) log d for arbitrarily small e. From there, it is straightforward to obtain the first strong information locking scheme that is efficiently computable using a quantum computer.

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## Making sense of non-Hermitian Hamiltonians

Wednesday Nov 24, 2010
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The average quantum physicist on the street believes that a quantum-mechanical Hamiltonian must be Dirac Hermitian (invariant under combined matrix transposition and complex conjugation) in order to guarantee that the energy eigenvalues are real and that time evolution is unitary. However, the Hamiltonian $H=p^2+ix^3$, which is obviously not Dirac Hermitian, has a real positive discrete spectrum and generates unitary time evolution, and thus it defines a fully consistent and physical quantum theory.

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## Conformal Field Theory (PHYS 609) - Lecture 3

Wednesday Nov 24, 2010
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## Mathematical Physics (PHYS 624) - Lecture 3

Wednesday Nov 24, 2010
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## Small thermal machines

Tuesday Nov 23, 2010
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The second law of thermodynamics tells that physics imposes a fundamental constraint on the efficiency of all thermal machines.
Here I will address the question of whether size imposes further constraints upon thermal machines, namely whether there is a minimum size below which no machine can run, and whether when they are small if they can still be efficient? I will present a simple model which shows that there is no size limitation and no limit on the efficiency of thermal machine and that this leads to a unified view of small refrigerators, pumps and engines.

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