Events During the Week of February 18th through February 25th, 2024
Monday, February 19th, 2024
- Hierarchies from string theory
- Time: 4:00 pm - 5:00 pm
- Place: 5280 Chamberlin Hall
- Speaker: Jakob Moritz, CERN
- Abstract: I will explain a series of my works that has resulted in the first ever construction of a controlled cosmological solution of string theory in which the vacuum energy — though negative in sign — is exponentially small, while extra dimensions are microscopic. I will also, in brief terms, outline some of my ongoing efforts to construct solutions with positive vacuum energy. Finally, I will turn to another series of my works about probing string theoretic axions — the string axiverse. I will argue that the strong CP problem is generically absent in string compactifications, and that future observation might well detect string theoretic axions through their couplings to photons.
- Host: Lisa Everett
Tuesday, February 20th, 2024
- No events scheduled
Wednesday, February 21st, 2024
- Axion Dark Matter: From the Laboratory to the Cosmos
- Time: 4:00 pm - 5:00 pm
- Place: 5280 Chamberlin Hall
- Speaker: Joshua Foster, MIT
- Abstract: The quantum chromodynamics (QCD) axion, a possible solution to the Strong CP Problem, and more general axion-like particles, with their intrinsic connection to high-scale theories like Grand Unification and String Theory, represent uniquely well-motivated dark matter candidates. As an ultralight particle, the phenomenology of the axion is fundamentally wave-like, requiring paradigmatically different approaches in the search for dark matter. In this talk, I will describe an ongoing multi-pronged search effort targeting the discovery of the axion through precision measurement with the ABRACADABRA and DMRadio detectors in conjunction with observation of extreme astrophysical systems that may generate smoking-gun signals of their interactions with axions. I will then show how state-of-the-art techniques in high-performance computing can be applied to simulate the nonlinear processes that generate axions in the early universe, leading to sharp predictions of the QCD axion mass and shedding light on the dynamics and observable signals associated with networks of topological defects.
- Host: Lisa Everett
Thursday, February 22nd, 2024
- No events scheduled
Friday, February 23rd, 2024
- No events scheduled