Nuclear Physics Seminar

semester, 2007


Thursday, January 18th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No seminar this week.

Thursday, January 25th 2007
3:00 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Scott Bowman, University of Minnesota
Subject: T.B.A.

Thursday, February 1st 2007
Speaker: Jim Kneller, University of Minnesota
Subject: Temporal Evolution of the Supernova Neutrino Signal

Thursday, February 8th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No seminar this week.

Tuesday, February 13th 2007
1:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Kenji Fukushima, Brookhaven National Laboratory, a candidate for the Nuclear Theory faculty position.
Subject: Exploring paradigms of QCD - Hot, Dense, and Energetic Matter

Quantum Chromodynamics (QCD) has rich contents under various
extreme environments. I will discuss recent developments of
hot and dense QCD I have been involved in; a complicated
phase structure of color superconductivity at high baryon
density, an effective description by the idea of the Color
Glass Condensate at high gluon density, and its application
to the very initial stage of heavy-ion collisions. I will
present some ongoing works and address a way to go from my
point of view.


Thursday, February 22nd 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No seminar this week.

Thursday, March 1st 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Misha Stephanov, University of Illinois, Chicago
Subject: AdS/QCD
Professor Stephanov is a candidate for the Nuclear Theory position at the associate professor level.

I shall describe a bottom-up approach to constructing a
higher-dimensional theory holographically dual to QCD: AdS/QCD.
Hadronic models built in this way simultaneously satisfy
chiral symmetry constraints together with QCD sum rules
and can be constrained by matching asymptotic behavior of QCD
correlation functions. The simplest model of this type gives a
remarkably good fit to low energy hadronic observables.


Thursday, March 8th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Feng Yuan, Brookhaven National Lab. Feng Yuan is a candidate for the Nuclear Theory Faculty position.
Subject: A New Spin on the Proton: the Perspective from RHIC

In the naive model of the proton, its 1/2 spin is carried by its
quark constituents. However, experiments over the last several decades have shown that the quark spin only contribute a small portion of the proton spin. In this talk, I will discuss the current status of world efforts for solving this "spin crisis", focusing on the theoretical challenges and the perspective from the RHIC spin program.


Thursday, March 15th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Spring Break: No Seminar this week.

Thursday, March 22nd 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Abhijit Majumder, Duke
Subject: Probing the structure of the strongly coupled Quark Gluon Plasma
Abhijit Majumder is a candidate for the nuclear theory faculty position at the assistant professor level.

The Relativistic Heavy-Ion Collider (RHIC) has produced a wide variety of measurements which have led to major strides in our understanding of the structure of strongly interacting matter heated beyond the deconfinement temperature. We focus on a class of observables centered around the perturbative modification of hard jets and jet-like correlations which have been instrumental in resolving the basic picture underlying some of the startling discoveries at RHIC. Jet modification and jet medium interactions will be shown to yield a consistent space-time profile of the expanding bulk matter and in conjunction with bulk fluctuations demonstrate sensitivity to the basic degrees of freedom prevalent in the Quark Gluon Plasma.


Thursday, March 29th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Alex Heger, Los Alamos National Lab and University of California, Santa Cruz
Subject: Nucleosynthesis in the First Stars
Alex Heger is a candidate for the faculty position

According to modern theory and cosmological simulations, the very
first generation of stars that formed in the universe typically
were much more massive than stars forming today. These first stars formed from the material left behind by the big bang, almost exclusively hydrogen and helium. Their resulting evolution and explosive deaths were much different from modern supernovae, with a different central engine and a much more powerful explosion. The resulting nucleosynthesis signatures, the ashes of the explosion, are predicted to show the fingerprint of this peculiar initial condition and evolution. No such fingerprint has ever been found in the observations, however. On the other hand, it will be shown that some not so massive stars with not so powerful explosions seem to be able to explain much of what was observed and considered to be the ashes of the first stars.


Thursday, April 5th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No Seminar this week.

Thursday, April 12th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Todd Springer, University of Minnesota
Subject: Cosmological Black Hole Formation and the QCD Phase Transition

Thursday, April 19th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Philippe de Forcrand, ETH Zurich and CERN
Subject: The QCD Phase Diagram at Finite Temperature and Density

I review the progress towards the determination of the QCD phase diagram by lattice simulations, and the difficulties encountered.


Thursday, April 26th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No seminar this week.

Thursday, May 3rd 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No Seminar this week.

Thursday, May 10th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
This seminar will resume in the fall.

Thursday, September 13th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No seminar this week.

Thursday, September 20th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No Seminar This Week

Thursday, September 27th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No seminar this week.

Thursday, October 4th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Scott Bowman, University of Minnesota

Thursday, October 11th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No seminar this week.

Thursday, October 18th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Yong Qian, University of Minnesota
Subject: Neutrino Mass Hierarchy and Stepwise Spectral Swapping of Supernova Neutrino Flavors

Thursday, October 25th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No seminar this week.

Thursday, November 1st 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Jim Kneller, University of Minnesota
Subject: The Lithium-6 Plateau

Thursday, November 8th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Yang Li, Iowa State
Subject: Gluon recombination in high parton density QCD

We argue that the collinear factorization of the fragmentation functions in high energy hadron and nuclear collisions breaks down at transverse momenta k_T ~ Q_s/g due to high parton densities in the colliding hadrons and/or nuclei. We then argue that gluon recombination, which is basically the merging of two classical fields, should dominate in that k_T regime. We calculate, at next-to-leading order in projectile parton density and to all orders in target parton density, the double-inclusive cross-section for production of a pair of gluons in the scalar J^{PC} = 0^{++} channel. We then generalize our results to AuAu collisions at RHIC energy. Using the low energy theorems of QCD we find the inclusive cross-section for pion meson and baryon production. Finally, we compare our results for baryon to meson ratio with the experimental data from RHIC.


Thursday, November 15th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No Seminar This Week

Thursday, November 29th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Todd Springer, University of Minnesota
Subject: Thermodynamics and Transport Coefficients from Gauge/Gravity Duality

Thursday, December 6th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Scott Bowman, University of Minnesota
Subject: Linear Sigma Model at Finite Temperature and Isospin Chemical Potential

In relativistic heavy ion collisions large numbers of pions are created. It may be possible for these pions to condense into the zero-momentum state, i.e. form a Bose-Einstein condensate. Pions have the special property of being Goldstone bosons of the spontaneously broken chiral symmetry of QCD. The O(N)-symmetric linear sigma model is used as an effective low energy model for QCD to understand the relationship between chiral symmetry breaking and Bose-Einstein condensation. This has recently been studied by Shu and Li and by Andersen. Shu and Li use the framework of the Cornwall-Jackiw-Tomboulis formalism and the 1/N approximation, while Andersen uses the 2PI (Phi derivable) method. I will review their work and attempt to go further in understanding the thermodynamic properties of the sytem.


Thursday, December 13th 2007
2:30 pm:
Nuclear Physics Seminar in 435 Physics
No seminar this week. This event will resume spring semester.

Thursday, December 20th 2007
This event will resume spring semester.

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