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Seminars & Lectures

* TITLE

Positivity of Dense Matter Effective Theory

* SPEAKERS

Name	Affiliation	E-mail
Prof. Steve Hsu	U. of Oregon

* HOST(Applicant)

Name	Affiliation	E-mail
-

* DATE / TIME

2002-02-20, 3:00 p.m. (50 min.)

* PLACE

Seoul Branch Office, 9th floor Seminar room

* ABSTRACT

He will extend the qualitative observations of the first lecture by
demonstrating that traditional model space methods give the same low
momentum effective theory that a renormalization group treatment of the
two-body problem gives. Motivated by the notion of renormalization group
flow, and the observation that low energy nuclear systems seem to possess
a separation of scales, we argue that different \"realistic\" meson exchange
potential models that share the same one pion tail but little else will
renormalize to the same low-momentum effective potential as we decimate
down to the energy scale (300-350 MeV lab) over which the potential models
are constrained by experimental data.
The resulting smooth and approximately unique effective potential is
phase equivalent to the bare input model, and can be used directly in shell
model calculations instead of the usual G matrix. Besides providing a
number of practical simplifications, this approach removes much of the
model dependence one traditionally finds due to the different short
distance structure of various meson exchange potential models that are
probed in many-body calculations. The low-lying spectra in several
two-valence particle nuclei are presented and found to be weakly dependent
on the momentum cutoff and in good agreement with experiments.

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