## Events - Weekly

Sunday,
March 26 |
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Monday,
March 27 |

Biophysics Seminar - Thierry Emonet, Yale U. “How diversity modulates collective behavior and vice versa: Lessons from bacteria” Joseph Henry Room · 12:00 p.m.– 1:00 p.m.HET Seminar | Nikolay Bobev, KU Leuven | "RG Flows Across Dimensions and Holography" Superconformal field theories placed in nontrivial background fields for the metric and the continuous global symmetries exhibit a rich web of RG flows across dimensions. I will discuss several examples of such flows and emphasize some of their universal features. In addition, I will employ non-perturbative tools such as 't Hooft anomaly matching, a-, F-, and c-extremization, and holography to gain a quantitative understanding of some aspects of these theories. Finally, I will discuss the relevance of these results for a microscopic understanding of the entropy of supersymmetric black holes and strings in AdS. PCTS Seminar Room · 2:30 p.m.– 3:30 p.m. |

Tuesday,
March 28 |

Wednesday,
March 29 |

Physics Group Meeting | Jennifer Lin, Member, School of Natural Sciences, IAS | "Algebraic EE and Holography” In the first part of the talk, I’ll explore whether EE’s of subalgebras not organized by position space in a holographic CFT may be useful for bulk reconstruction. In particular I'll explain how the lengths of non-minimal geodesics in AdS3 conical defect backgrounds can be interpreted as the EE's of certain subalgebras in the dual CFT. This part will be based on 1608.02040. In the second part of the talk, I'll discuss how the Ryu-Takayanagi area seems to be a boundary entropy, that is the analog of an edge term one finds when defining EE in a gauge theory, and how one might try to test this. Bloomberg Hall of Physics Library - Institute for Advanced Study · 1:45 p.m.– 2:45 p.m. |

Thursday,
March 30 |

Friday,
March 31 |

Gravity Group Seminar, Will Coulton (Princeton University) "Cosmology and astrophysics from the bispectrum" TITLE Cosmology and astrophysics from the bispectrum ABSTRACT The three point function of the cosmic microwave background (CMB) is an ideal place to study CMB secondary sources as there is no noise bias and CMB secondaries are the dominant contribution. In this talk I will discuss my work measuring the bispectrum from radio galaxies, dusty star forming galaxies and thermal Sunyaev Zel'dovich sources in ACT and Planck maps. I will then discuss what we hope to learn from the bispectrum with ongoing surveys. Joseph Henry Room · 12:00 p.m.– 1:00 p.m.HET Seminar | Netta Engelhardt, Princeton University | "Lightcone Cut Holography" In this talk, I will give an answer to the question “which QFT states holographically describe the emergence of semiclassical (conformal) geometry?” via a new construct in QFT: the causal density matrix. This new construct relies on the “lightcone cut” approach to spacetime emergence, and generalizes it to arbitrary QFTs (that may or may not have holographic duals). In the presence of a semiclassical spacetime, lightcone cuts explain both the emergence of holographic dimensions and the way in which geometry is encoded in a holographic dual. Properties of the causal density matrix indicate that some features of quantum error correction are more general than AdS/CFT. Within AdS/CFT, I will argue that the “reduced” causal density matrix is dual to the causal wedge. Jadwin A06 · 1:45 p.m.– 2:45 p.m. |

Saturday,
April 1 |