THE BOSTON AREA PHYSICS CALENDAR
Week of April 28-May 4, 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 ENTRIES RECEIVED AFTER THE DEADLINE WILL NOT 
BE PUBLISHED.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, April 29, 1996
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Monday, April 29, 1996, 4:00 p.m. 
 
Worcester Polytechnic Institute 
Colloquium  
Olin Hall, Room 107 
 ``Progress in the Development of High Temperature 
Superconducting Wires'' 
DR. A. P. MALOZEMOFF 
American Superconductor Corporation, Westboro  
Refreshments will be served in Olin 118 at 3:45 p.m. 
 
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Monday, April 29, 1996, 4:30 p.m. 
 
Brown University 
Colloquium  
Barus & Holley Building, Room 168 
``Newton's law of gravitation from the apple's perspective?'' 
PROFESSOR RANDY WAYNE 
Cornell University 
Refreshments will be served at 4:00 p.m.  
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Monday, April 29, 1996, 4:30 p.m. 
 
Harvard University 
Morris Loeb Lectures in Physics  
Jefferson Laboratory, Room 250 
``Changing Views of Renormalization'' 
PROFESSOR STEVEN WEINBERG 
 Josey Regental Professor of Science, 
University of Texas at Austin \char38 
Morris Loeb Lecturer on Physics, Harvard University 
Tea will be served in Jefferson 461 at 4:00 p.m.  

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Tuesday, April 30, 1996
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Tuesday, April 30, 1996, 12:00 noon 
 
Massachusetts Institute of Technology 
Rowland Institute for Science 
Seminar on Modern Optics and Spectroscopy  
Ronald E. McNair Building 
Marlar Lounge (37-252) 
``Atomic Motion in Nonlinear Potentials'' 
MARK G. RAIZEN  
University of Texas at Austin  
Refreshments will be served following the Seminar. 
 
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Tuesday, April 30, 1996, 2:30 p.m. 
 
Brandeis University 
Theoretical Seminar  
Physics Building, Room 229  
``Covariant Single-Time Bound-State Equation'' 
PROFESSOR O.W. GREENBERG 
University of Maryland  
 
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Tuesday, April 30, 1996, 2:30 p.m. 
 
 Harvard University 
 CfA-Tufts-MIT Cosmology Seminar  
Pratt Conference Room 
 ``Observational Probes of the Very Early Universe'' 
PROFESSOR ANDREW LIDDLE 
 University of Sussex, UK 
 
 Abstract: 
 
Cosmological inflation provides a theory for the initial
conditions for structure formation in the universe. In order to
capitalise on the rapidly improving observational situation, it is
necessary to ensure accurate predictions from inflation. In particular,
inflation produces gravitational waves as well as density perturbations
and they may provide a distinctive probe of the inflationary paradigm.
Finally, a survey is made of the present observational status of
inflation-based structure formation models, covering both microwave
background anisotropies and large scale structure observations such as
galaxy clustering and object abundances.
 
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Tuesday, April 30, 1996, 3:00 p.m. 
 
Harvard University 
Morris Loeb Lectures in Physics 
Lecture I  
Jefferson Laboratory, Room 250 
``Antibrackets, Symmetries and Renormalization'' 
PROFESSOR STEVEN WEINBERG 
Josey Regental Professor of Science, 
University of Texas at Austin \char38 
Morris Loeb Lecturer on Physics, Harvard University 
 
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Tuesday, April 30, 1996, 4:00 p.m. 
 
Brandeis University 
Martin Weiner Lecture Series 
Physics Colloquium  
Physics Building, Abelson 131 
``Color: From Baryon Spectroscopy to QCD'' 
PROFESSOR O.W. GREENBERG 
University of Maryland  
Refreshments will be served in Room 333 at 3:30 p.m. 
 
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Tuesday, April 30, 1996, 4:00 p.m. 
 
 Northeastern University 
Center for Interdisciplinary Research on Complex Systems 
 CIRCS Seminar  
Dana Research Center, Room 114 
 ``Modeling Complex Social Systems: Income Inequality,
Social Capital and Mortality'' 
DR. BRUCE KENNEDY 
 Harvard School of Public Health  
 Refreshments will be served at 3:45 p.m. 
 
 
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Tuesday, April 30, 1996, 4:15 p.m. 
 
 Massachusetts Institute of Technology 
 Astrophysics Colloquium  
The Marlar Lounge, Room 37-252 
 ``Planets Around Pulsars and Elsewhere'' 
PROFESSOR ALEXANDER WOLSZCZAN 
 Pennsylvania State University 
 Refreshments will be served at 3:45 p.m.  
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Wednesday, May 1, 1996
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Wednesday, May 1, 1996, 11:45 a.m. 
 
 Northeastern University 
 
 ***** Diamond Anniversary Lectures *****  
 
A series of ten pedigogical lectures 
Lecture VIII 
 
114 Dana (Physics Department) 
 ``Exactly Solvable Models in Statistical Mechanics'' 
DR. RODNEY J. BAXTER 
Australian National University 
 
 
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Wednesday, May 1, 1996, 1:15 - 2:45 p.m. 
 
Harvard University 
Special Condensed Matter Theory Seminar  
McKay 532  
``Macroscopic Order Parameter Dynamics in Disordered and 
Frustrated Spin Systems'' 
DAVID SHERRINGTON 
CNLS, Los Alamos National Lab and 
Physics Department, Oxford University 
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Thursday, May 2, 1996
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Thursday, May 2, 1996, 12:00 noon 
 
Harvard University 
Condensed Matter Theory Seminar  
Pierce 100F  
``Density Functional Theory of Flux-Lattice Melting in 
High Tc Superconductors'' 
GAUTAM I. MENON 
Theoretical Physics Group, Tata Institute of Fundamental 
Research, Bombay, India 
 
 
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Thursday, May 2, 1996, 1:30 p.m. 
 
Harvard University Division of Applied Sciences 
Materials Science Seminar  
David Turnbull Room 
Gordon McKay Laboratory, Room 402  
``Smoothing of Patterned Anisotropic Surfaces'' 
PROFESSOR WILLIAM W. MULLINS 
Department of Materials Science and Engineering 
Carnegie-Mellon University 
Pittsburgh, PA 
 
Abstract: 
 
The smoothing of a surface patterned or grooved in one dimension and of
average orientation near that of a facet (cusp) is considered under two
conditions: surface steps are all of one sign (patterned vicinal surface)
or are of both signs. In the former case, smoothing occurs as steps
straighten and spread to a uniform spacing. A kinetic treatment yields
information on step line and interaction energies and on transport
coefficients. In the latter case, smoothing requires step annihilation. If
orientations neighboring the facet are unstable, steps in the grooved
surface are held together in alternating bundles of opposite sign by
attractive forces. Step annihilation then requires fluctuations in which
the outer steps break away from adjacent bundles and cross the intervening
facet. The kinetics of this process will be discussed. 
 
 
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Thursday, May 2, 1996, 2:30 p.m. 
 
Brown University 
Theoretical Seminar  
Barus & Holley Building 
Room 555 
 ``The r-Matrix Formalism in Calogero-Moser Models'' 
PROFESSOR ESTELLE BILLEY 
 University of Paris, (LPTHE Paris 6) 
 
 
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Thursday, May 2, 1996, 3:00 p.m. 
 
Harvard University 
Morris Loeb Lectures in Physics 
Lecture II  
efferson Laboratory, Room 250 
 ``Antibrackets, Symmetries and Renormalization'' 
PROFESSOR STEVEN WEINBERG 
Josey Regental Professor of Science, 
University of Texas at Austin & 
Morris Loeb Lecturer on Physics, Harvard University 
 
 
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Thursday, May 2, 1996, 4:00 p.m. 
 
Harvard-Smithsonian Center for Astrophysics 
Scientific Colloquium  
60 Garden Street (Phillips Auditorium) 
``Mystery of the Nazca Lines'' 
DR. ANTHONYY F. AVENI 
Colgate University 
 
Abstract: 
 
        On a clear day, from the heights of an airplane circling over
the Pampa Ingenio near Nazca, Peru, one sees the enigmatic ground
drawings or geoglyphs that have puzzled scholars since their discovery
in the 1930's.  Lines etched on high ground near the Nazca River shoot
out for 20 miles or more--lifelike drawings depicting monkeys, birds,
fish and spiders also cover the landscape.  Pre-Incaic Nazca peoples
created these gigantic drawings by removing masses of dark surface
stones to expose the lighter soil beneath.  Various theories, some
less plausible than others, have been formulated that seek to explain
the meaning and purpose of the Nazca lines.  A current notion, based
on the fact that practically all straight lines are tied to ray or
spoke patterns, is that the lines might have functioned like the
ceques of Cuzco, the Inca capital.  These radial sight lines were used
to organize the city into structured social, geographic (especially
hydrological) and political units.  But it is also possible that some
of the lines were astronomically and calendrically oriented. 
 
        In this illustrated lecture the classification of the
geoglyphs is reviewed and a number of seemingly diverse hypotheses
relating to their origins are entertained and put to the test by the
examination of relevant evidence derived from remains on the pampa. 
 
Tea will be served at 3:30 p.m. 
 
 
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Thursday, May 2, 1996, 4:30 p.m. 
 
Brown University 
Condensed Matter Seminar  
Barus & Holley Building 
Room 751 
``Phase string effect in the t-J model'' 
PROFESSOR ZHENG-YU WENG 
University of Houston 
 
 Abstract: 
 
We show that a hole moving on a quantum antiferromagnet will pick up
a trace of phases from the spin background which is nonrepairable
and thus is crucial to the long-wavelength physics.  As an example,
I review how the 1D Luttinger-liquid behaviors in the t-J model can
be correctly reproduced after incorporating such a phase string
effect.  Then I discuss the 2D case where the phase string effect
induces a nonlocal interaction between the charge and spin degrees
of freedom, leading to a systematic anomalies in both spin and
charge channels which are consistent with the experimental
measurements of the high-Tc cuprates. 
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Friday, May 3, 1996
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Friday, May 3, 1996, 12:00 noon 
 
Massachusetts Institute of Technology 
NFL Seminar 
Condensed Matter Theory  
Room 12-132 
``Avalanches, Hysteresis and Plain Old Criticality'' 
KARIN DAHMEN 
Harvard University 


 
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A Friendly Reminder:

The Deadline for the May 5-May 11, 1996 Issue is: 
 
MONDAY, April 29, 1996 at 11:00 a.m. 
 
End of Document