THE BOSTON AREA PHYSICS CALENDAR
Week of Monday, May 18 - May 24, 1997
 
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 ENTRIES RECEIVED AFTER THE DEADLINE WILL NOT 
BE PUBLISHED.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, May 19, 1997
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Monday, May 19, 2:00 p.m.

Massachusetts Institute of Technology
Monday Research Seminar 
Center for Theoretical Physics Seminar Room
Building 6, Third Floor
``Fun with New SO(N) Duals''
PETER CHO
Harvard University

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Tuesday, May 20, 1997
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Tuesday, May 20, 4:00 p.m.

Northeastern University
The Center for Interdisciplinary Research on
Complex Systems
CIRCS Seminar 
Dana Research Building, Room 114
``Human Visual Perception''
PROFESSOR ADAM REEVES
Northeastern University

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Wednesday, May 21, 1997
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Wednesday, May 21, 3:00 p.m.

Massachusetts Institute of Technology
Monday Research Seminar 
Center for Theoretical Physics Seminar Room
Building 6, Third Floor
``QCD WITH DOMAIN WALL QUARKS''
DR. A. SONI
Brookhaven National Laboratory

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Thursday, May 22, 1997
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Thursday, May 22, 12:00 noon

Harvard University
Condensed Matter Theory Seminar 
Pierce 100F
``Spectrum and transport of the Lange and Hubbard Model''
DR. H.R. KRISHNAMURTHY
Harvard University and Indian Institute of Science, Bangalore 

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Thursday, May 22, 4:00 p.m.

Harvard-Smithsonian Center for Astrophysics
Scientific Colloquium 
60 Garden Street (Phillips Auditorium)
``The Emancipation of Slaved Accretion Disks: Why Disks Warp and 
Precess''

Abstract:

Accretion disks are frequently misaligned with respect to their apparent
sources of angular momentum. X-ray binaries like SS 433 and Hercules X-1
have tilted, precessing disks; water maser observations of AGNs like NGC
4258 and NGC 1068 reveal warped disks in profile.

Previous models of warped and precessing disks have proposed that the
disks are "slaved" to boundary conditions, or are responding to
gravitational torques. But these beg the question of why disks become
misaligned in the first place.

I will discuss a new instability (discovered by Pringle) that may solve
this longstanding problem.  Radiation from the nucleus is reprocessed
nonaxisymmetrically by a slightly warped disk. The pattern of radiation
pressure (and/or radiative heating) leads to torques that can enhance
the warp and drive precession. Thus, disks apparently become warped
spontaneously.

I will review the theoretical progress we have made in understanding
this instability and in applying it to X-ray binaries and AGNs.

DR. MITCHELL BEGELMAN
JILA, University of Colorado
Boulder, Colrado
Tea will be served at 3:30 p.m. 

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Thursday, May 22, 4:00 p.m.

Northeastern University
Physics Colloquium 
Dana 114
``Spin-Fluctuation Superconducting Pairing in Copper Oxides
(Microscopical Approach)''
N.M. PLAKIDA
Joint Institute for Nuclear Research
Dubna, RUSSIA 
Refreshments will be served at 3:45 p.m.

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Friday, May 23, 1997
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Friday, May 23, 2:00 p.m.

Harvard University
Joint Seminar for the History of 20th Century Science 
Science Center, Room 226
``Virtual Nuclear Weapons Science''
PROFESSOR HUGH GUSTERSON
STS, MIT

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  A Friendly Reminder:

  The Deadline for the May 25-May 31, 1997 Issue is: 

	MONDAY, May 19, 1997 at 11:00 a.m. 

	NO ENTRIES WILL BE ACCEPTED 
	AFTER THE DEADLINE. 
  


End of Document
From bapc@tuhepa.phy.tufts.edu Wed May 14 12:16:45 1997
Date: Wed, 14 May 1997 11:19:11 -0400
From: Boston Area Physics Calendar 
To: nihat@cmt5.mit.edu, berzinis@bcvms.bc.edu, ELSYE@mitlns.mit.edu,
    joe_blatt@harvard.edu, Mattox@bu.edu, cmiller@trincoll.edu,
    dept@BUPHY.BU.EDU, roberta@mit.edu, rbonney@mit.edu,
    catterall@physics.brown.edu, carr@gauss.rl.plh.af.mil,
    echaisso@pearl.tufts.edu, chase@usa1.com, currier@physics.harvard.edu,
    John.dawson@unh.edu, effeld@amherst.edu, rcfletcher@aol.com,
    galison@fas.harvard.edu, physics@media.mit.edu, guth@ctp.mit.edu,
    physics_dept@physics.harvard.edu, aph@space.mit.edu,
    kackley@rowland.org, theory@het.brown.edu, ZBLE35A@prodigy.com,
    rlamont@providence.edu, HLVX@world.std.com, cindy@marie.mit.edu,
    arandono@emerald.tufts.edu, MALONEW@Polaroid.com,
    martin@physics.brown.edu, cmiller@trincoll.edu,
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    pauli@aaec.com, petschek@buasta.bu.edu, walter@venus.rose.brandeis.edu,
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    oleg@xray.harvard.edu, altmana@woods.uml.edu,
    mitchel@tuhepa.phy.tufts.edu
Subject: BAPC Addendum



THE BOSTON AREA PHYSICS CALENDAR
Week of Monday, May 18 - May 24, 1997
 
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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						ADDENDUM
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Wednesday, May 21, 1997
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Wednesday, May 21, 2:30 p.m.

University of Massachusetts, Boston
Physics Seminar 
Learning Center, Conference Room 3
Healy Library Building, Upper Level
``Is Our Neural System Wired Like the Contacts Between Green
Peas in Their Can?''
GEORGES WAYSAND
Groupe de Physique des Solides
Universities Denis Diderto and Pierre et Marie Curie 
Paris, FRANCE
Refreshments will be served following the talk.

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