QCD, STRINGS AND BLACK HOLES:
The Large N limit of field theories and gravity
PROFESSOR JUAN MALDACENA
Department of Physics
Harvard University
ABSTRACT:

QCD (Quantum Cromodynamics) is believed to be the theory for strong interactions.  However, despite its successes to describe high energy processes it has not been possible to do calculationsat low energies (e.g. calculate the mass of the proton).  It is believed that a large N (N is the number of colors) approximation would simplify the theory.  Furthermore, this  simplified theory would be a free string theory.We consider a supersymmetric version of QCD where one can find this string theory quite explicitly.   The strings move in a higher dimensional space, and they describe a quantum theoryof gravity in this  higher dimensional space.  higher dimensional space, and they describe a quantum theory of gravity in this  higher dimensional space.  This leads, on the one hand, to an explicit solution for the large N dynamics of this theory, and on the other hand, to a description of quantum gravity, quantum black holes, etc., in terms of a conventional field theory.
 

MONDAY, OCTOBER 4, 999
4:15 PM
Building 2, Room 105
Refreshments will be served at 3:45 PM in Building 2, Room 349

Applied Math Colloquium:  http://www-math.mit.edu/amc/fall99
Math Department:  http://www-math.mit.edu