Colloquium #151 on 24-8-04 at 4:00 PM
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                            Colloquium #151
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         Institute for Plasma Research, Bhat, Gandhinagar
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                         Prof. S. K. Dana
                       Instrument Division,
               Indian Institute of Chemical Biology,
                          Kolkata, India

                                on

      Anomalous Phase Synchronization in Coupled Oscillators


 Two  coupled  oscillators with a frequency mismatch rotate with a
 common frequency above a critical coupling. The common notion  of
 transition  to  such  phase synchrony shows monotonic decrease in
 frequency mismatch of the coupled oscillators with  coupling.  In
 contrast,  the  anomalous  onset  of  phase synchronization (APS)
 shows an initial increase in  frequency  mismatch  with  coupling
 strength before following the usual transition to phase synchrony
 with a maximum at an intermediate  coupling.  APS  is  first  ob-
 served, recently, in arrays of a Foodweb model for global and lo-
 cal coupling. It is,  later,  established  as  a  universal  phe-
 nomenon,  as  it  found  true  for any system with an appropriate
 choice of systems parameters and when two or many parameters have
 functional  dependence. The first experimental evidence of APS is
 found, very recently, in two coupled Chua's oscillators for  dif-
 fusive  and unidirectional coupling. Anomalous transition to both
 in-phase and antiphase is observed in experiments with  two  cou-
 pled Chua's oscillators.


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                       Date:       August 24, 2004 (Tuesday)
                       Venue:      Seminar Hall
                       Programme:  3:40 PM  : Refreshments
                                   4:00 PM  : Talk
                                   5:00 PM  : Discussion
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