Found 5 result(s)

29.10.2013 (Tuesday)

On conformal higher spin models

Regular Seminar Arkady Tseytlin (Imperial)

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 KCL
room 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 KCL
room 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 IC
room Maths Institute seminar room
abstract: