We invite you to please join us for CCAPP seminar this week at 11:30 on February 8th! This will be a virtual seminar, and our speakers this week will be Angela Collier (University of Colorado, Boulder)and Jeff Lazar (University of Wisconsin & Harvard).
Link for the CCAPP Seminar on Tuesday:
https://osu.zoom.us/j/96209154804?pwd=d1lWZnRueGVVa2tabUZTak4xSkpaQT09password: CCAPP-2021
Angela Collier
Title: Halo-Bar Coupling: How Dark Matter Defines Galaxies
Abstract: The coupling of a host dark matter halo to a stellar bar forms a dark matter substructure near the galactic center which has implications on dark matter annihilation/decay signal strength and morphology expectations. Additionally, these bar-driven dark matter substructures have wide-ranging effects on galaxy dynamics and evolution. In this talk, I will review halo-bar coupling and demonstrate the extensive effects on galaxy morphology such as stellar bar destruction, formation of bar-driven dark matter substructure, and leading spiral arms. I will also present preliminary work showing signal expectations associated with the Milky Way bar-driven dark matter substructure.
Jeff Lazar
Title: Solar Neutrinos: From MeV to EeV
Abstract: While the Sun has already proved a fruitful laboratory for neutrino physics, high-energy solar neutrinos may continue to provide insight. For example, current-generation neutrino telescopes have searched for an excess of neutrinos from the Sun's direction as evidence of annihilating weakly interacting massive particles (WIMPs) at energies from ~0.1 GeV to 10^4 GeV. Detection of these neutrinos would be a smoking-gun signature of WIMPs since backgrounds from the Sun are well-understood. Furthermore, there is a well-predicted but unmeasured flux of neutrinos created in cosmic-ray interactions with the solar atmosphere. Detecting this flux may shed light on the unexpected dip observed in the solar ring γ-ray spectrum. The IceCube neutrino telescope is a gigaton-scale neutrino telescope located between 1450m and 2450m beneath the geographic South Pole. The detector geometry makes it well-suited to carrying out such solar neutrino searches. In this seminar, I will present the status of IceCube's ongoing solar WIMP and solar atmospherics searches and describe theoretical efforts to extend these searches.
