23,156 research outputs found
Anisotropic flow in the forward directions at sqrt(s_NN) = 200 GeV
The addition of the two Forward TPCs to the STAR detector allows one to
measure anisotropic flow at forward pseudorapidities. This made possible the
first measurement of directed flow at collision energies of sqrt(s_NN) = 200
GeV. PHOBOS' results on elliptic flow at forward rapidities were confirmed, and
the sign of v2 was determined to be positive for the first time at RHIC
energies. The higher harmonic, v4, is consistent with the recently suggested
v2^2 scaling behavior.Comment: 4 pages, 5 figures; write-up of a poster (see
http://cern.ch/Oldenburg/Talks/QM2004_Flow_Poster.pdf) presented at Quark
Matter 2004, Oakland; reference 10 correcte
The Vlasov-Poisson system with radiation damping
We set up and analyze a model of radiation damping within the framework of
continuum mechanics, inspired by a model of post-Newtonian hydrodynamics due to
Blanchet, Damour and Schaefer. In order to simplify the problem as much as
possible we replace the gravitational field by the electromagnetic field and
the fluid by kinetic theory. We prove that the resulting system has a
well-posed Cauchy problem globally in time for general initial data and in all
solutions the fields decay to zero at late times. In particular, this means
that the model is free from the runaway solutions which frequently occur in
descriptions of radiation reaction
Many-body wavefunctions for normal liquid He
We present new trial wave-functions which include 3-body correlations into
the backflow coordinates and a 4-body symmetric potential. We show that our
wavefunctions lower the energy enough to stabilize the ground state energies of
normal liquid He in the unpolarized state at all pressures in agreement
with experiment; however, quantitative discrepancies remain. Further, we
include strong spin coupling into the Fermi liquid by adapting pairing wave
functions. We demonstrate a new, numerically stable method to evaluate pairing
functions which is also useful for Path Integrals calculations at low, but
non-zero temperatures.Comment: 5 page
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