BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260729T180739Z
LAST-MODIFIED:20121116T203436Z
DTSTART:20110214T173000Z
DTEND:20110214T183000Z
UID:event772@bu.edu
URL:http://physics.bu.edu/internal/events/show/772
SUMMARY:Space-Time\, Quantum Mechanics and Scattering Amplitudes
DESCRIPTION:Featuring Nima Arkani-Hamed\, Institute for Advanced Study\n\nP
	art of the HET Seminar Series.\n\nAbstract:  Scattering amplitudes in gauge
	 theories and gravity have\nextraordinary properties that are completely in
	visible in the textbook formulation of quantum field theory using Feynman d
	iagrams. In the standard approach--;going back to the birth of quantum fiel
	d theory--;space-time locality and quantum-mechanical unitarity are made ma
	nifest at the cost of introducing huge gauge redundancies in our descriptio
	n of physics. As a consequence\, apart from the very simplest processes\, F
	eynman diagram calculations are enormously complicated\, while the final re
	sults turn out to be amazingly simple\, exhibiting hidden infinite-dimensio
	nal symmetries. This strongly suggests the existence of a new formulation o
	f quantum field theory where locality and unitarity are derived concepts\, 
	while other physical principles are made more manifest. Rapid advances have
	 been made towards uncovering this new picture\, especially for the maximal
	ly supersymmetric gauge theory in four dimensions. These developments have 
	interwoven and exposed connections between a remarkable collection of ideas
	 from string theory\, twistor theory and integrable systems\, as well as a 
	number of new mathematical structures in algebraic geometry. In this talk I
	 will review the current state of this subject and and describe a number of
	 ongoing directions of research.
LOCATION:PRB 595\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR