June 29, 2018 | 12:00 PM | ERC 401 | Friday noon seminar Mapping the Milky Way in 6D with Gaia Jo Bovy, The University of Toronto
One of the main goals of Gaia, a new astrometric satellite mission, is to provide an empirical measurement of the distribution of stars in the 6+N dimensional space of position, velocity, age, mass, elemental abundances, color, magnitude, etc.. Knowledge of this empirical distribution will allow the formation, evolution, and dynamics of the Milky Way to be strongly constrained. I will give an overview of the Gaia mission and discuss novel methods to map the Milky Way in position and velocity using the billion-star Gaia catalog. I will then discuss results on the stellar content and dynamics of the solar neighborhood from applying these techniques to Gaia's first and second data release. I will also discuss the implications of the structure in the velocity distribution in the extended solar neighborhood observed in Gaia's second data release.
July 18, 2018 | 3:30 PM | ERC 445 | Special seminar CANCELLED Black Holes for Massive Gravitons Rachel Rosen, Columbia University
In this talk I will review the status of black hole solutions for theories in which the gravitational force is mediated by a massive spin - 2 particle. I will present the arguments that such black holes must necessarily be time - dependent and I will discuss the implications for black hole mechanics.
July 5, 2018 | 3:00 PM | PRC 201 | Open Group seminar Electroweak Baryogenesis through varying Yukawas in Composite Higgs models Sebastian Bruggisser, DESY
Varying Yukawas open new possibilities for electroweak baryogenesis. In this talk I will start by introducing varying Yukawas as a source of CP-violation and explain how baryogenesis can be successful in this framework. I will then present a realization of this paradigm in Composite Higgs models with partial compositeness. Composite Higgs models are, apart from the usual benefits, particularly compelling for this scenario as they feature an intimate link between flavour and Higgs physics. We will see that baryogenesis can be successful in these models if the confinement phase transition happens at the same time as the electroweak phase transition. I will identify regions in parameter space where this is fulfilled and I will compute the baryon yield of those models.
July 9, 2018 | 12:00 PM | ERC 501 | Special Seminar The Drunken Trek of Ultra-High-Energy Cosmic Rays Through The Magnetic Field of the Milky Way Vasiliki Pavlidou, University of Crete
Cosmic rays are charged so that the magnetic field of the galaxy acts as a distorting lens to our view of the ultra-high-energy cosmic ray sky. I will discuss how we can reconstruct this lens and use it to our advantage to investigate both where cosmic rays come from, and what their composition is.