## Events - Weekly

**May 2013 >>**

Sunday,
May 5 |
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Monday,
May 6 |

Tuesday,
May 7 |

Math Physics Seminar, Alessandro Giuliani, University of Rome, Striped states at the ferromagnetic transition We consider a two-dimensional Ising model with nearest neighbor ferromagnetic and long-range, power-law decaying, antiferromagnetic interactions. We assume that the decay exponent of the antiferromagnetic part is larger than 4. The ground state displays a transition as the strength of the ferromagnetic interaction J is increased: if J is smaller than a critical value J_c, then the ground state is non-uniform, while it becomes uniform for all J>J_c. The transition to the uniform state is believed to take place in a ``universal" manner, via a sequence of transitions among periodic striped states. In this talk we report recent rigorous results confirming this picture: namely, the ratio of the ground state energy to the one of the optimal periodic striped state tends to 1 as J-->J_c^-. The proof is based on a combination of localization bounds into mesoscopic boxes and reflection positivity. Joint work with E. Lieb and R. Seiringer. Jadwin A06 · 4:30 p.m.– 6:00 p.m. |

Wednesday,
May 8 |

Thursday,
May 9 |

Friday,
May 10 |

High Energy Theory Seminar - IAS - Thomas Faulkner, IAS - The Entanglement Renyi Entropies of Disjoint Intervals in AdS/CFT I will discuss how to compute Entanglement Renyi Entropies for two dimensional holographic CFTs using AdS_3 handlebody solutions. Some simplifying assumptions are made. The answer I find is consistent with the Ryu-Takayanagi prediction for Entanglement Entropy. Bloomberg Lecture Hall - Institute for Advanced Study · 1:30 p.m.– 2:30 p.m. |

Saturday,
May 11 |