## Events - Weekly

Sunday,
February 7 |
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Monday,
February 8 |

High Energy Theory - John Gracey, University of Liverpool - "Higher dimensional quantum field theories - old methods for the modern arena" We review recent results of the renormalization group functions of scalar quantum field theories in various spacetime dimensions and their application to recent ideas in conformal field theories as a prelude to the extension to gauge theories. At the outset we concentrate on six dimensional phi^3 theory and briefly discuss and update its connection with condensed matter models. For instance, four loop estimates of critical exponents in various dimensions are given which are competitive with strong coupling methods. More generally the six dimensional theory is part of a tower of related field theories. Central to the connectivity of this d-dimensional tower of theories in the same universality class is the Wilson-Fisher fixed point. This is analysed via the large N expansion. A similar approach is then used for non-abelian gauge theories and the Lagrangian in that universal tower is also constructed from 4 to 6 dimensions building on the well-founded one from 2 to 4. Once the six dimensional gauge theory is established in the same universality class, the conformal window and critical exponents are determined at two loop order, for example. This analysis is extended to three loops for abelian theories and higher dimensions. PCTS Seminar Room · 2:30 p.m.– 3:30 p.m. |

Tuesday,
February 9 |

Pheno & Vino Seminar, Yoni Kahn, Princeton, "A Broadband Approach to Axion Dark Matter Detection" When ultralight axion dark matter encounters a static magnetic field, it sources an effective electric current which follows the magnetic field lines and oscillates at the axion Compton frequency. I will describe a new experiment to detect this axion effective current which, unlike most existing proposals, does not rely on a resonant enhancement of the signal. This broadband approach has advantages at low axion mass, can probe many decades of axion mass simultaneously, and potentially has sensitivity to GUT-scale QCD axions. Jadwin 111 · 10:30 a.m.–12:00 p.m. |

Wednesday,
February 10 |

Thursday,
February 11 |

How to Be a Male Ally to Women in STEM - Dr. Christopher Kilmartin Although women have made considerable progress in entering STEM fields, they continue to be an underrepresented minority, and the male-dominated cultures of these fields can pose challenges to their inclusion. Most men are respectful of women and want to be welcoming and inclusive, yet many are unsure about how to do so. In this presentation Dr. Kilmartin helps aspiring male allies to understand the barriers and facilitators to participating in creating and maintaining an atmosphere of gender equality and respect, and gives suggestions for men's continuing development of the skills needed to be allies. Registration required:https://gradschool.princeton.edu/forms/women-stem-seminar-registration Carl A. Fields Center · 12:00 p.m.– 1:00 p.m.Hamilton Colloquium Series - Sebastian Seung, Princeton University: "Structure and function of the retina" The importance of determining and interpreting the structures of atoms, crystals, and proteins was established long ago. I will discuss current efforts to extend this paradigm to the brain, focusing on new discoveries concerning the structure of the retina gained through 3D electron microscopy, computer vision, and crowdsourcing. I will also describe how such structural information is helpful for understanding how the retina carries out the first steps of visual perception. Jadwin A10 · 4:30 p.m.– 6:00 p.m. |

Friday,
February 12 |

Gravity Group Seminar, Vicky Kalogera (Northwestern University) "The Quest for the Era of Gravitational-Wave Astrophysics" Following a multi-year upgrade the LIGO detectors turned on this past September for the first Advanced LIGO observing run (O1). In this talk I will discuss the significance of this increased sensitivity in the context of searches for gravitational waves from binary compact objects. PCTS Seminar Room · 12:00 p.m.– 1:00 p.m.High Energy Theory Seminar - Aitor Lewkowycs, Princeton University - TBA PCTS Seminar Room · 1:45 p.m.– 3:00 p.m.Special Cosmology Seminar, Soichiro Isoyama (U. of Guelph) "Hamiltonian dynamics of large-mass-ratio binaries: the self-force approach" Abstract: Large-mass-ratio compact binaries (stellar compact objects inspiral into super massive black holes) are a main source of future gravitational observatory such as eLISA. These systems are highly effective to explore the strong-field geometry of massive black holes, and extracting these information from emitted gravitational signals demands an accurate theoretical model of binary dynamics. The self-force approach, which describes motion of a small body in a curved spacetime including the back-reaction of its own gravitational field to the motion, is one of such models. In this talk, we discuss the orbital dynamics of large-mass-ratio binaries in self-force approach. I will begin by reviewing the foundation of the self-force in perturbation theory, and will proceed to outline its recent Hamiltonian formulation. The Hamiltonian formulation provides a clear prescription and powerful scheme for practical implementation of self-forced motion, particularly in Kerr spacetime. Next, we will discuss the application of our Hamiltonian formulation. Focusing on its conservative sector, I will report the recent calculations of conservative post-geodesic effects on motion in Schwarzschild and Kerr geometry, and will discuss how they make a fruitful contact with post-Newtonian theory and numerical relativity. Joseph Henry Room · 3:00 p.m.– 4:00 p.m. |

Saturday,
February 13 |