Found 5 result(s)

### 29.10.2013 (Tuesday)

#### On conformal higher spin models

 at: 16:00 City U.room CG05 abstract:

### 11.03.2009 (Wednesday)

#### On reduced model for strings in AdS5 x S5

Regular Seminar Arkady Tseytlin (Imperial College)

 at: 13:15 KCLroom 423 abstract:

### 06.02.2008 (Wednesday)

#### Pohlmeyer reduction of AdS(5) x S5 superstring sigma model

Regular Seminar Arkady Tseytlin (Imperial college)

 at: 15:00 KCLroom 2B14 abstract:

### 05.02.2008 (Tuesday)

#### Pohlmeyer reduction of AdS(5) x S5 superstring sigma model

Regular Seminar Arkady Tseytlin (Imperial College London)

 at: 17:00 City U.room C322 abstract: Motivated by a desire to find a useful 2d Lorentz-invariant reformulation of the AdS_5 x S 5 superstring world-sheet theory in terms of physical degrees of freedom we construct a Pohlmeyer-reduced version of the corresponding sigma model. Starting with a coset space string sigma model in the conformal gauge and writing the classical equations in terms of currents one can fix the residual conformal diffeomorphism symmetry and kappa-symmetry and introduce a new set of variables (related locally to currents but non-locally to the original string coordinate fields) so that the Virasoro constraints are automatically satisfied. The resulting gauge-fixed equations can be obtained from a Lagrangian of a non-abelian Toda type: a gauged WZW-model with an integrable potential coupled also to a set of 2d fermionic fields. We show that in the special case of the AdS_2 x S2 superstring model the reduced theory is equivalent to the N=2 supersymmetric extension of the sine-Gordon model.

### 26.02.2007 (Monday)

#### Sigma model RG flow and Perelman's entropy

String Theory & Geometry Seminar Arkady Tseytlin (Imperial College)

 at: 13:30 ICroom Maths Institute seminar room abstract: