Nuclear and Particle Physics Colloquium
Refreshments @ 4:00pm
Andy Strominger, Harvard University
"The Kerr/CFT Correspondence: Holography in the Sky"
Basic principles of quantum mechanics and general relativity are used
Host: Alan Guth
President's Day Vacation
Thomas Schaefer, North Carolina State University
"In Search of the Perfect Fluid"
Experiments at the Relativistic Heavy Ion Collider (RHIC) indicate that the quark gluon plasma is a very good fluid. Motivated by these results we study the question whether there is a fundamental limit to the " "perfectness'' of a fluid. We review arguments based on kinetic theory as well as string theory that suggest that there is lower bound for the ratio of shear viscosity to entropy density. We present an analysis of experimental results for the shear viscosity of the best quantum fluids that have been studied in the laboratory. This includes Bose fluids (such as liquid Helium), Fermi fluids (dilute atomic Fermi gases near a Feshbach resonance), and gauge theory plasmas (the QGP at RHIC).
Host: John Negele
Rene Ong, University of California, Los Angeles
JOINT with Astro
"Viewing the Universe at Very High Energies"
field of very high energy (VHE) astrophysics has developed rapidly
during the last few years as a result of new instruments and exciting
Host: Gabriella Sciolla
Bonnie Fleming, Yale
"The US LArTPC program: ArgoNeuT, MicroBooNE, and Beyond
Liquid Argon Time Projection Chambers are precision neutrino detectors which appear scalable to very large volumes. This combination makes them very promising detectors for long baseline neutrino oscillation physics. Their fine-grained tracking and total absorption calorimetry capabilities translate to sensitivity to neutrino oscillation physics significantly better than conventional detection techniques such as Water Cerenkov detectors. Recently, interest in these detectors in the US has grown, and a program to scale these detectors to the large sizes needed for long baseline physics has come into focus. This program, including the ArgoNeuT and MicroBooNE projects, will be described.
Host: Joe Formaggio
TUESDAY March 17th
JOINT WITH ASTRO in the MARLAR LOUNGE
Chris Stubbs, Harvard University
"The Large Synoptic Survey Telescope: from Dark Energy to Killer Asteroids"
Abstract: I will describe the motivation and status of the Large Synoptic Survey Telescope (LSST), a project currently in the design stage that promises to usher in the era of cosmic cinematography by scanning the entire accessible sky every few days, to 24th magnitude. The LSST is being engineered to minimize potential sources of systematic error for precision photometry and weak lensing. The LSST will allow for unprecedented parallel science from a common image stream, for topics ranging from fundamental physics to a census of the solar system.
Host: Gabriella Sciolla
Andre Hoang, Heisenberg Max Planck Institute
"Non-Relativistic QCD and Precision Quarkonium Physics"
About 20 years ago non-relativistic QCD (NRQCD) emerged as an effective theory of quantum chromodynamics. Prior to this time the available theoretical calculations lead to ill-defined predictions for quarkonium processes. NRQCD resolved these problems and made precise and consistent predictions possible. In this talk I review the development and the applications of NRQCD, including the current polarization puzzle at hadron colliders. I also will discuss a modern version of NRQCD, known as vNRQCD, which gives an improved understanding of the internal dynamics of quarkonium systems, including methods to sum large logarithms and to systematically describe unstable particles. These features allow quarkonium systems to be used for precise measurements of QCD parameters such as the strong coupling and quark masses. As applications I discuss measurements of the bottom quark mass from current experimental data, and a method for measuring the top mass from the top pair threshold at a future lepton collider with an order of magnitude better precision than it is known today.
Host: Iain Stewart
Evelyn Thomson, University of Pennsylvania
"Search for the standard model Higgs boson at the Tevatron"
I will discuss the status of the standard model Higgs boson search. At
Host: Steve Nahn
"Many body lattice QCD"
the first steps have been taken in this direction by the NPLQCD
collaboration who have performed a series of numerically studies of
systems of up to twelve pions and/or kaons. These investigations have
allowed us to determine the low energy three-pion interaction for the
first time, and are a first step towards many body physics from QCD.
The ground state of these multi-pion/multi-kaon systems for large
numbers of particles is a Bose-Einstein condensate.
I will discuss these recent results and more general aspects of many body lattice QCD.
Host: John Negele
Patriot's Day Vacation
Neal Weiner, NYU Center for Cosmology and Particle Physics
"Illuminating Dark Matter"
The existence of dark matter has been confirmed by a wide variety of experiments, on a wide variety of length scales. However, the nature of the dark matter remains elusive. One intriguing class of candidates - weakly interacting massive particles of "WIMPS" - offer the prospect of detection in cosmic rays, in direct detection experiments, and at colliders. Of late, there has been as increasing set of experimental signal, principally from cosmic rays, which may be providing a first sign of dark matter. I will explore the range of signals and anomalies, and the challenges of understanding all of them in terms of dark matter. We will see that, if dark matter is responsible for these anomalies, it may be pointing us to a much richer set of physics in the dark sector.
Host: Alan Guth
Petr Vogel, Caltech
"Detecting Cosmic Neutrino Background"
First, derivation of the predicted number density of the cosmic
Host: Peter Fisher
Francis Halzen, University of Wisconsin at Madison
"High-Energy Neutrino Astronomy: Towards a Kilometer-Scale Neutrino Observatory"
Kilometer-scale neutrino detectors such as IceCube are discovery instruments covering nuclear and particle physics, cosmology and astronomy. Examples of their multidisciplinary missions include the search for the particle nature of dark matter and for additional small dimensions of space. In the end, their conceptual design is very much anchored to the observational fact that Nature produces photons and protons with energies in excess of one hundred and one hundred million Terraelectronvolts, respectively. The cosmic ray connection sets the scale of cosmic neutrino fluxes. The problem has been to develop a robust and affordable technology to build the kilometer-scale neutrino detectors required to do the science. The AMANDA telescope transforming ultra-clear deep Antarctic ice into a Cherenkov detector of muons and showers initiated by neutrinos of all three flavors, has met this challenge. Having collected more than 6000 well-reconstructed muon neutrinos of 50 GeV ~ 500 TeV energy, AMANDA represents a proof of concept for the ultimate kilometer-scale neutrino observatory, IceCube, now half complete and already producing results exceeding in sensitivity seven years of AMANDA data.
Gabriella Sciolla (Chair)