The Utility of Quantum Field Theory

Abstract

This talk surveys a broad range of applications of quantum field theory, as well as some recent developments. The stress is on the notion of effective field theories. Topics include implications of neutrino mass and a possible small value of $\sin (2\beta )$, supersymmetric extensions of the standard model, the use of field theory to understand fundamental issues in string theory (the problem of multiple ground states and the question: does string theory predict low energy supersymmetry), and the use of string theory to solve problems in field theory. Also considered are a new type of field theory, and indications from black hole physics and the cosmological constant problem that effective field theories may not completely describe theories of gravity.

25 pp, latex, Plenary talk at ICHEP 2000,typos and refs. fixed

References in corpus (29)

• A Large Mass Hierarchy from a Small Extra Dimension
• An Alternative to Compactification
• The Hierarchy Problem and New Dimensions at a Millimeter
• Large N Field Theories, String Theory and Gravity
• The World as a Hologram
• Monopole Condensation, And Confinement In N=2 Supersymmetric Yang-Mills Theory
• Modulus Stabilization with Bulk Fields
• Effective Field Theory, Black Holes, and the Cosmological Constant
• Quantization of Four-form Fluxes and Dynamical Neutralization of the Cosmological Constant
• Hierarchies without Symmetries from Extra Dimensions
• The String Dual of a Confining Four-Dimensional Gauge Theory
• Supersymmetry Breaking through Transparent Extra Dimensions
• Experimental Probes of Localized Gravity: On and Off the Wall
• Opening up extra dimensions at ultra-large scales
• Self-tuning flat domain walls in 5d gravity and string theory
• Casimir Effect Between World-Branes in Heterotic M-Theory
• Dynamical Compactification as a Mechanism of Spontaneous Supersymmetry Breaking
• Multi-Instanton Calculus and the AdS/CFT Correspondence in N=4 Superconformal Field Theory
• The Cosmological Constant Problem from a Brane-World Perspective
• On likely values of the cosmological constant
• Vacuum Energy Cancellation in a Non-supersymmetric String
• Of CP and other Gauge Symmetries in String Theory
• New origin for approximate symmetries from distant breaking in extra dimensions
• Supersymmetry, Naturalness, and Dynamical Supersymmetry Breaking
• Supersymmetric Nonlinear Sigma Models as Gauge Theories
• On Anthropic Solutions of the Cosmological Constant Problem
• Flavor at the TeV Scale with Extra Dimensions
• Dynamics of Supersymmetric SU(n_c) and USp(2n_c) Gauge Theories
• Massive Ghosts in Softly Broken SUSY Gauge Theories