#
Geometry and String Theory

Fall 2009

## Fall 2009 Schedule

Date | Speaker | Topic |
---|

9/2 | Dan Freed | K-Theory and orientifolds I |

9/9 | Dan Freed | K-Theory and orientifolds II |

9/16 | Aswin Balasubramanian | Hyperbolic monopoles and AdS/CFT |

9/23 | Jacques Distler | The S-Matrix for $\mathcal{N}=4$ SYM and Twistor Space, I |

9/30 | Jacques Distler | The S-Matrix for $\mathcal{N}=4$ SYM and Twistor Space, II |

10/7 | Oscar Chacaltana | A Dual Theory for the $\mathcal{N}=4$ SYM S-matrix, Twistors and Grassmannians, I |

10/14 | Oscar Chacaltana | A Dual Theory for the $\mathcal{N}=4$ SYM S-matrix, Twistors and Grassmannians, II |

10/21 | Oscar Chacaltana | A Dual Theory for the $\mathcal{N}=4$ SYM S-matrix, Twistors and Grassmannians, III |

10/28 | ?? | ?? |

### References

#### K-Theory and orientifolds

- Distler, Freed and Moore, Orientifold Precis (arXiv:0906.0795)

#### Hyperbolic monopoles

- M. Atiyah, Magnetic monopoles in hyperbolic spaces. (Bombay 1984, Proceedings)
- A. Chakrabarti, Construction Of Hyperbolic Monopoles, J.Math.Phys.27:340,1986.

#### S-matrix for $\mathcal{N}=4$ SYM in twistor space

- Arkani-Hamed, Cachazo and Cheung, The Grassmannian Origin Of Dual Superconformal Invariance (arXiv:0909.0483)
- Arkani-Hamed, Cachazo, Cheung and Kaplan, A duality for the S-matrix (arXiv:0907.5418)
- Arkani-Hamed, Cachazo, Cheung and Kaplan, The S-matrix in twistor space (arXiv:0903.2110)
- Arkani-Hamed, Cachazo and Kaplan, What is the Simplest Quantum Field Theory? (arXiv:0808.1446)