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Events on Thursday, April 29th, 2010

R. G. Herb Condensed Matter Seminar
Can the Moon affect entanglement transfer?
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Joseph H. Eberly, University of Rochester
Abstract: Surprises have emerged from studies of entanglement evolution in quantum theory, and counter-intuitive predictions [1] have been confirmed in experiment [2]. It is implicit in most analyses of entanglement evolution that the observer is all-powerful and able to determine a system state completely, but this is usually not true. One reason is that all aspects of a party's quantum state typically cannot be identified. Unknown and non-interacting external parties are typically not mentioned, excluded from view even if entangled with the system of interest. We will refer to this always-present but hidden and non-interacting background universe as the "Moon", and will present a sample sketch showing the effect of this Moon on entanglement evolution.

[1] See the review: T. Yu and J.H. Eberly, Science 323, 598 (2009).

[2] M. P. Almeida, F. de Melo, M. Hor-Meyll, A. Salles, S.P. Walborn, P.H. Souto-Ribeiro and L. Davidovich, Science 316, 579 (2007).
Host: Robert Joynt
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Many-body high energy QCD: from wee partons to the perfect fluid
Time: 4:00 pm
Place: 4274 Chamberlin
Speaker: Raju Venugopalan, Brookhaven National Laboratory
Abstract: A high energy hadron can be visualized as a Lorentz contracted core of valence partons accompanied by a furry sea of wee partons. The many-body properties of these wee
partons and their evolution with energy can be described by a weak coupling effective field theory called the Color Glass Condensate (CGC). Novel factorization theorems allow us to understand quantitatively the early time
dynamics of heavy-ion collisions when two CGCs shatter forming a classical fluid called the Glasma. We discuss the properties of this Glasma and some of its experimental manifestations in heavy-ion collisions.
If time permits, we shall outline outstanding conceptual issues in understanding the evolution of the Glasma into the Quark-Gluon Plasma.
Host: Michael Ramsey-Musolf
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