Friday 16 April 2021 |

Events for day: Wednesday 14 April 2021 |

11:00 - 12:00 Wednesday Weekly Seminar-google meetGravitational waves as a probe for electroweak sector of particle physics School PARTICLES AND ACCELERATORS Abstract: We study the dynamics of electroweak phase transition in a simple extension of the Standard Model where the Higgs sector is extended by adding an $SU(2)_L$-mutiplet. By making random scans over the parameters of the model, we show that there are regions consistent with constraints from collider experiments and the requirement for a strong first-order electroweak phase transition which is needed for electroweak baryogenesis. Further, we also study the power spectrum of the gravitational waves which can be generated due to the first-order phase transitions. Observation of such gravitational waves, such as by future space-based gravit ... 16:30 - 18:00 Weekly Seminar (Online)Light from Dark Solitons https://www.skyroom.online/ch/soa/weekly-seminar School ASTRONOMY Abstract: Axions and Axion-like fields are popular in cosmology, both as the inflaton and as dark matter. Such fields can naturally condense into long-lived, spatially localized configurations (oscillons, axion stars etc). I will discuss conditions under which such solitons become effective antennas for electromagnetic radiation by converting axions to photons, which can lead to potential observational signatures. I will also discuss multimessenger signals: electromagnetic and gravitational wave emission from soliton collisions. Time permitting, I will digress to advertise a separate topic of CMB birefringence from a different type of ... 16:30 - 17:30 Mathematics ColloquiumStickelberger and the Eigenvalue Theorem School MATHEMATICS The Eigenvalue Theorem is a basic result in computational algebraic geometry. It says that solving a zero-dimensional system of polynomial equations can be reduced to an eigenvalue problem in linear algebra. The name of Ludwig Stickelberger (1850-1936) is often attached to this theorem, yet papers that use his name never cite any of his papers. My lecture will explore the reasons for this. The answer involves a lovely trace formula in algebraic number theory and an algebra textbook published by Gunter Scheja and Uwe Storch in 1988. To get more information about the colloquium, join to the following google group: https://groups.g ... |