Quantum Fields and Strings

This series consists of talks in the area of Quantum Fields and Strings.

Seminar Series Events/Videos

Currently there are no upcoming talks in this series.

A Microscopic Limit on Gravitational Waves from D-brane Inflation

Thursday Oct 19, 2006
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Kahler Metrics for Chiral Matter in Calabi-Yau String Compactifications

Thursday Oct 19, 2006
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In string compactifications, Kahler metrics for chiral matter fields are an essential prerequisite for the computation of soft supersymmetry breaking terms. I describe new techniques for computing these in Calabi-Yau string compactifications. This involves deducing the modular behaviour of the Kahler metric from that of the physical Yukawa couplings. Using these techniques I derive Kahler metrics for both KKLT and large-volume models. For the latter case, I discuss two applications.

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How a black hole emerges from a pure state

Tuesday Oct 17, 2006
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1/4 BPS Loops in N=4 Super-Yang-Mills: Bridges between weak and strong coupling

Tuesday Oct 10, 2006
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Matching of the Hagedorn temperature in AdS/CFT

Tuesday Sep 26, 2006
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Counting BPS states on the Quintic

Tuesday Sep 19, 2006
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Giant Magnons

Tuesday Sep 12, 2006
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Studies of ${cal N}=4$ super Yang Mills operators with large R-charge have shown that, in the planar limit, the problem of computing their dimensions can be viewed as a certain spin chain. These spin chains have fundamental magnon\'\' excitations which obey a dispersion relation that is periodic in the momentum of the magnons. This result for the dispersion relation was also shown to hold at arbitrary \'t Hooft coupling. Here we identify these magnons on the string theory side and we show how to reconcile a periodic dispersion relation with the continuum worldsheet description.

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Born-Infeld Black Holes

Tuesday Jun 20, 2006
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Magnetic domain walls of relic fermions as Dark Energy

Tuesday Jun 20, 2006
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Geometric Flows and String Theory

Tuesday Jun 13, 2006
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Geometric flows, especially the Ricci flow, have been used with considerable success in recent years to address the Poincare and Thurston conjectures for 3-manifolds. In this talk, I will briefly introduce these geometric flows, and describe how they appear in a completely different context in the physics of string theory. I will then outline how recently developed techniques in geometric flows could be used to address questions of importance in string theory.

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LECTURES ON-DEMAND

Gabriela González, Louisiana State University

Speaker: Gabriela Gonzalez