THE BOSTON AREA PHYSICS CALENDAR
Week of October 20 - October 26, 1996
 
The Boston Area Physics Calendar is published weekly during 
the academic year by the Department of Physics and Astronomy 
at Tufts University.  You may send your announcements by 
e-mail (bapc@tuhepa.phy.tufts.edu) or FAX:(617-627-3878).  
We cannot accept announcements by telephone.  Entries should 
reach us no later than 11:00am on the Monday preceding the week 
of the event. ENTRIES RECEIVED AFTER THE DEADLINE WILL NOT 
BE PUBLISHED.           
                
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Monday, October 21, 1996
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Monday, October 21, 2:00 p.m.

Massachusetts Institute of Technology
Monday Research Seminar 
Center for Theoretical Physics
Building 6 - Third Floor, Room 6-321
``G/G Models as the Strong Coupling Limit of Topologically
Massive Gauge Theory''
PASQUALE SODANO
INFN, Perugia 

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Monday, October 21, 4:00 p.m.

Worcester Polytechnic Institute
Colloquium 
Olin Hall, Room 107
``The Theory of Laser Noise''
DR. MELVIN LAX
CCNY & Bell Laboratories 
Refreshments will be served in Olin 118 at 3:45 p.m.

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Monday, October 21, 4:30 p.m.

Brown University
Colloquium 
Barus  Holley Building
Room 168
``Strings and the New Physics''
PROFESSOR CUMRUN VAFA
Harvard University 
Refreshments will be served at 4:00 p.m.

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Monday, October 21, 4:30 p.m.

Harvard University
The Morris Loeb Lectures in Physics
Special Lecture 
Jefferson 250
``A Physicist in Congress: The Clash of Two Cultures''
THE HONORABLE VERNON J. EHLERS
Member, United States Congress (R-MI) 
Tea will be served in Jefferson 461 at 4:00 p.m.

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Tuesday, October 22, 1996
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Tuesday, October 22, 12:00 p.m.

Massachusetts Institute of Technology
Seminar on Modern Optics and Spectroscopy 
The Marlar Lounge
Room 37-252
``Schrodinger's Cat and Quantum Computers''
CHRISTOPHER R. MONROE
NIST 
Refreshments will be served following the seminar.
For map see http://amo.mit.edu/mos.html

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Tuesday, October 22, 2:30 p.m.

Brandeis University
Theoretical Seminar 
The Physics Building, Room 229
``D-branes and Short Distances''
DR. DANIEL KABAT
New York University 

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Tuesday, October 22, 4:00 p.m.

Brandeis University
Martin Weiner Lecture Series, Physics Colloquium
Physics Building, Abelson 131 
``Almost Magical World of Photonic Crystals''
PROFESSOR JOHN D. JOANNOPOULOS
Massachusetts Institute of Technology
Refreshments will be served in Room 333 at 3:30 p.m. 

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Tuesday, October 22, 4:00 p.m.

Northeastern University
Center for Interdisciplinary Research on Complex Systems (CIRCS)
Scientific Seminar 
Dana Research Center
Room 114
``Energy Migration in Photosystem II Reaction Centers''
DR. A. DEMIDOV
Northeastern University 

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Tuesday, October 22, 4:15 p.m.

Massachusetts Institute of Technology
Astrophysics Colloquium 
The Marlar Lounge
Room 37-252
``X-Ray Observations of Clusters of Galaxies''
DR. RICHARD MUSHOTZKY
NASA Goddard Space Flight Center 
Refreshments will be served at 3:45 p.m.

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Wednesday, October 23, 1996
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Wednesday, October 23, 4:15 p.m.

Boston College
Departmental Colloquium 
Higgins Hall
Room 354
``Brownian Motion in the Presence of a Temperature Gradient''
PROFESSOR P. MAZUR
University of Leiden, The Netherlands 
Tea will be served at 3:30 p.m.

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Wednesday, October 23, 5:00 p.m.

Harvard University/Center for Astrophysics
Joint Atomic Physics Seminar 
Jefferson Laboratory, Room 356
``Quantum States of Cold Atoms''

Abstract:

The efficiency of laser cooling has advanced to the point where it
      routinely achieves temperatures in the microKelvin range.  This
      translates to a kinetic energy corresponding to a few kHz, an
      atomic mean velocity of a few mm/sec, and deBroglie wavelength a
      few tenths of a micron.  In a standing-wave light field suitable
      for laser cooling, atoms undergo light shifts of the order of MHz, 
      far more than their KE, so they are trapped in wavelength-size 
      regions of space in the hills and valleys associated with the 
      standing wave.  This is a most interesting situation:  the deBroglie 
      wavelength is comparable to the size of the confinement region.  
      Then the atomic motion is quantized, atoms can no longer be thought
      of as localizable particles whose position and momentum can be known
      simultaneously, and their motion has to be described by deBroglie wave
      optics.  For example, atoms can tunnel between adjacent valleys in the
      periodic standing wave, and band structure appears in their allowed
      motional energies.  Several other fascinating effects of
      quantization of the motion appear, including entanglements of the
      internal and motional states.  This talk will address several
      topics connected with quantum states of atomic motion. 

DR. HAROLD METCALF
State University of New York 
Tea will be served at 4:30 p.m.

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Wednesday, October 23, 4:30 p.m.

Massachusetts Institute of Technology
Joint Theory Seminar 
Center for Theoretical Physics
Building 6 - Third Floor, Room 6-321
``D-Branes and Short Distances''
DANIAL KABAT
NYU 

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Thursday, October 24, 1996
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Thursday, October 24, 12:45 p.m.

Boston University
BioPhysics Seminar 
Room SCI-352, 590 Commonwealth Avenue
``Is Biological Evolution at Equilibrium, and Why Not?''
Speaker: PROFESSOR PREBEN ALSTROM
Niels Bohr Institute 

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Thursday, October 24, 2:30 p.m.

Brown University
Theoretical Seminar 
Barus & Holley Building
Room 555
``To Be Announced''
Speaker: To Be Announced

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Thursday, October 24, 4:00 p.m.

Harvard-Smithsonian Center for Astrophysics
Scientific Colloquium 
60 Garden Street (Phillips Auditorium)
``X-ray Emission from Clusters of Galaxies--
A Cosmological Laboratory''

Abstract:

In the last 5 years our knowledge of the x-ray emission
from clusters has exploded with high quality Rosat image and ASCA
spectra. We are now able to obtain detailed measurements of the
mass and mass distribution of clusters out to radii of ~1 Mpc for
relaxed systems.over a a mass range from 10^1^3-4^1^5 solar masses.
These data confirm that the baryonic mass fraction of clusters
is more than that implied by big bang nucleosynthesis and
omega=1, the so-called baryon catastrophe. However we now have
direct evidence that the baryon fraction can vary from cluster to
cluster.

In addtion the abundances of O,Si,S,and Fe can be reliably obtained
over the same mass range. For massive clusters the elemental ratios
strongly indicate that type II supernova were responsible for most of
the metals. However less massive systems may have a substantial
contribution from type Is, The total mass of alpha burning elements
strongly indicates that most galaxies went through a extremely
luminous early phase which resulted in the ejection of ~1/2 of their
total mass. The total energy involved was on the order of 1/4-1/2 of
the present day binding mass of the cluster, showing the importance
of non-gravitational energy sources for structure formation.
The Fe abundance in clusters shows little if any change out to 
redshifts of ~0.5 confirming the early enrichment
of the intergalactic medium in clusters. 

DR. RICHARD MUSHOTZKY
Goddard Space Flight Center
Greenbelt, MD 
Tea will be served at 3:30 p.m.

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Thursday, October 24, 4:00 p.m.

Northeastern University
Condensed Matter Seminar 
114 Dana
``Sonoluminescence: Lightning Storm in a Bubble''
PROFESSOR MICHAEL BRENNER
Applied Mathematics Department
Massachusetts Institute of Technology 
Refreshments will be served at 3:45 p.m.

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Friday, October 25, 1996
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Friday, October 25, 12:30 p.m.

Boston University
Condensed Matter Seminar 
Rm 352, 590 Commonwealth Avenue
``Manipulation of C60 Molecules Using a Scanning 
Tunneling Microscope''
DR. ANDREW DUNN
University of Nottingham, England 

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Friday, October 25, 12:30 p.m.

Tufts University
Lunchtime Cosmology Seminar 
Robinson Hall, Room 258
``On the Back Reaction Problem for Gravitational
Perturbations''
DR. RAUL ABRAMO
Brown University 
Please call 353-2600 to arrange for parking.

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Friday, October 25, 4:00 p.m.

Harvard University
Division of Engineering and Applied Sciences
Condensed Matter Seminar 
Pierce Hall, Room 209
``The Atomic-Level Origins of Friction''
DR. JACQUELINE KRIM
Northeastern University 
Refreshments will be served following the seminar in the Brooks Room.

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A Friendly Reminder:

The Deadline for the October 27 - November 2, 1996 Issue is:

MONDAY, October 21, 1996 at 11:00 a.m.
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End of Document