# Nuclear Physics & RIKEN Theory Seminar

## "High-Energy Gluon Bremsstrahlung in a Finite, Expanding Medium"

#### Presented by Peter Arnold, University of Virginia

Friday, November 14, 2008, 2:00 pm — Small Seminar Room, Bldg. 510

High-energy gluon bremsstrahlung in a QCD plasma is suppressed by the Landau-Pomeranchuk-Migdal (LPM) effect. At very high energies E, various folks have analyzed the problem analytically in the limit that

log(E) is treated as large. In this talk, I will give a qualitative discussion of the LPM effect and the equations which describe it. Then I will present new results that magically simplify previous formulas derived for the bremsstrahlung gluon emission spectrum in the large

log(E) limit. I will also discuss the interplay between two different approximations that have been used to study energy loss in the large

log(E) limit, known as the "harmonic oscillator" approximation and the opacity expansion.

Hosted by: Gregory Soyez

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