Events Calendar View

• Mathematical Physics Seminar Aug 28, 2013

  - no meeting this week

  

  Wednesday, August 28, 2013 4:40 pm - 5:30 pm
  Location:

  iCal
• Departmental Colloquium Aug 29, 2013

  Massive Star Formation Through The Universe

  

  Guest: Jonathan Tan, University of Florida
  Thursday, August 29, 2013 4:00 pm - 5:00 pm
  Location: Physics Auditorium Rm. 202

  iCal

  Massive stars have played a dominant role in shaping our universe since its earliest times, but there is no consensus on the mechanism by which they form. I review the physical processes thought to be important in massive star formation, concentrating on a particular theoretical model, Turbulent Core Accretion. This assumes the initial conditions are massive, turbulent, magnetized cloud cores of gas and dust that are reasonably close to virial equilibrium. We test this via theoretical simulations of the physics and chemistry of the interstellar medium and observational searches for these cores. We next consider the protostellar collapse phase as a massive star grows from the core. Various forms of feedback become important in reducing the efficiency of accretion, although it is not clear if one particular mechanism operates to set a fundamental limit on the maximum stellar mass. Again, these theoretical ideas can be tested by observations of massive stars forming in our Galaxy today. Finally, I discuss an application of massive star formation theory to the early universe: how massive were the first stars and could they have been the progenitors of supermassive black holes?

• Mathematical Physics Seminar Sep 4, 2013

  Connecting asymptotic analysis in mathematics and physics

  

  Guest: Brad Bassler, Dept. of Philosophy, UGA
  Wednesday, September 4, 2013 4:40 pm - 5:30 pm
  Location: Physics Building Conference Room (204B)

  iCal
• Departmental Colloquium Sep 5, 2013

  Atomic and Molecular Collisions using a Time-Dependent Close-Coupling Method

  

  Guest: Mitch Pindzola, Auburn University
  Thursday, September 5, 2013 4:00 pm - 5:00 pm
  Location: Physics Auditorium Rm. 202

  iCal

  We review the recent progress made in applying the time-dependent close-coupling approach to ionizing collisions of electrons, photons, and bare ions with small atoms and molecules.

• Mathematical Physics Seminar Sep 11, 2013

  Connecting asymptotic analysis in mathematics and physics, cont.

  

  Guest: Brad Bassler, Dept. of Philosophy, UGA
  Wednesday, September 11, 2013 4:40 pm - 5:30 pm
  Location:

  iCal
• Departmental Colloquium Sep 12, 2013

  Exploring Spin Glasses and other Complex Energy Landscapes with Extremal Dynamics

  

  Guest: Stefan Boettcher, Emory University
  Thursday, September 12, 2013 4:00 pm - 12:00 am
  Location: Physics Auditorium Rm. 202

  iCal

  I describe Extremal Optimization (EO), a general-purpose, local search heuristic for hard combinatorial (and physical) problems  such as bi-partitioning (ie, model-B ferromagnets), coloring (ie, Potts antiferromagnets), and max-cut (ie, Ising Spin Glasses). EO is motivated by the Bak-Sneppen model of self-organized criticality (SOC). SOC provides a general dynamics of driven dissipative systems that operate far from equilibrium and exhibit many emergent properties,  such as scale-free fluctuations, memory and learning, and persistent returns to untypical (here: ground-state) configurations. The generic properties of EO are explored, which explain the efficiency of EO in searching many 'complex energy-landscapes'. Numerical results of EO are discussed especially for the Edwards-Anderson spin-glass problem.

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