"Reorganizing the QCD pressure at intermediate coupling"Michael Strickland , Gettysburg College [Host: Peter Arnold ]
ABSTRACT:
The perturbative expansion of the pressure of QCD is known to order g^6 log(g), however, the resulting series is poorly convergent at phenomenologically relevant temperatures/couplings. I will discuss a method for improving the convergence of the successive approximations to the QCD pressure in a systematic manner which exactly reproduces the perturbative series in the weak-coupling limit. The method relies on folding in information about the correct high-temperature degrees of freedom via the hard-thermal-loop (HTL) resummation scheme. In order to give some background I will also discuss the poor convergence of quantum mechanics for the ground state of an anharmonic oscillator and present results for the three loop HTL-improved pressure of QED. Finally, I will present new results of an HTL-improved calculation of QCD thermodynamics to three-loops and critically discuss how this compares to available lattice data.
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High Energy Physics Seminar Tuesday, October 27, 2009 3:30 PM Physics Building, Room 204 Note special date. Note special room. Joint HEP/Nuclear Seminar |
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