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String Seminars

This series consists of talks in the area of Superstring Theory.

Seminar Series Events/Videos

Currently there are no upcoming talks in this series.

 

Mardi sep 11, 2012
Speaker(s): 

When nuclear matter is heated beyond a temperature of 2 trillion

degrees, it converts into a strongly coupled plasma of quarks and

gluons, the sQGP. Experiments using highly energetic collisions

between heavy nuclei have revealed that this new state of matter is a

nearly ideal, highly opaque liquid. A description based upon string

theory and black holes in five dimensions has made the quark- gluon

plasma an iconic example of a strongly coupled quantum system. In this

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Jeudi aoû 23, 2012
Speaker(s): 

TBA

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Mardi aoû 21, 2012
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TBA

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Lundi aoû 13, 2012
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Knowledge of all-alpha' higher derivative corrections to leading order BPS and non-BPS brane actions would serve in future endeavor of determining the complete form of the non-abelian BPS and tachyonic effective actions. In this talk, we note that there is a universality in the all-alpha' order corrections to BPS and non-BPS branes. I talk about computing all amplitudes between one Ramond-Ramond C-field vertex operator and several SYM gauge/scalar vertex operators.

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Mardi mai 29, 2012
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We add a gravitational background lattice to the simplest holographic model of matter at finite density and calculate the optical conductivity. With the lattice, the zero frequency delta function found in previous calculations (resulting from translation invariance) is broadened and the DC conductivity is finite. The optical conductivity exhibits a Drude peak with a cross-over to power-law behavior at higher frequencies. Surprisingly, these results bear a strong resemblance to the properties of some of the cuprates.

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Mardi mai 22, 2012
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A local renormalization group procedure is proposed where length scale is changed in spacetime dependent manner. Combining this scheme with an earlier observation that high energy modes in renormalization group play the role of dynamical sources for low energy modes at each scale, we provide a prescription to derive background independent holographic duals for field theories.

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Mardi mai 08, 2012
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It is well known that on-shell recursion relation can be applied to tree-level amplitude in string theory. One technical issue of the application is the sum of infinite middle on-shell states. We discuss how we can do the sum exactly to reproduce the known result.

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Mardi mar 27, 2012
Speaker(s): 

A series of generalizations of the Weierstrass normal
form for elliptic curves to the case of K3 surfaces will be presented.  These have already been applied to better
understand F-theory/Heterotic string duality. 
We will see how they also resolve a long-standing question of which
"mirror-compatible" variations of Hodge structure over the
thrice-punctured sphere can arise from families of Calabi-Yau threefolds.

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