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Duncan Rocha (University of Chicago)02/12/2025, 12:00
The electron–positron phase of the Future Circular Collider (FCC-ee) will offer an opportunity to significantly improve measurements of the Standard Model parameters. One possible measurement is the Higgs–electron coupling, which requires a year of dedicated run time. In this talk, I will first summarize the experimental strategy and projected sensitivities for this program at FCC-ee, and how...
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Hengameh Bagherian (University of Chicago)02/12/2025, 12:30
We propose a minimal and natural dark-sector framework in which dark matter is composed of magnetic monopoles coupled to a light axion field. Through the Witten effect, the axion background induces electric charge on the monopoles, turning them into dyons that in turn modify the axion potential. This monopole-dependent axion mass provides a simple, radiatively stable mechanism for dark-sector...
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Owen Leonard (Indiana University)02/12/2025, 13:00
The QCD axion, which solves the strong CP problem and constitutes a dark matter candidate, remains one of the most motivated signals of physics beyond the Standard Model. In the canonical scenario, the QCD axion mass-coupling relation fixes the interaction strength below the reach of most experiments, which target lighter or more strongly coupled axions. However, no fundamental principle...
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Michael Wentzel (University of Illinois Urbana-Champaign)02/12/2025, 13:30
Finite density corrections to the lighter-than-QCD axion can invert the effective axion potential, sourcing a non-trivial axion field inside dense objects. In this talk, I will present the first numerical study of the complete dynamics of the lighter-than-QCD axion in a neutron star in 1+1 general relativity, extending the region of analysis of the lighter-than-QCD axion to low-mass axions...
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Toni Bertólez-Martínez (University of Wisconsin Madison)02/12/2025, 15:00
The high densities in the early Universe provide a unique laboratory to constrain couplings between feebly interacting particles, such as dark matter and neutrinos. I will introduce a model where neutrinos get their mass from a small diagonal coupling to ultralight dark matter (ULDM), and how to consistently use cosmology, namely Big Bang Nucleosynthesis (BBN), to constrain it. In particular,...
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Nimrod Shapir (University of Chicago)02/12/2025, 15:30
As one of NASA’s proposed future Astrophysics Probe missions, the Advanced X-ray Imaging Satellite (AXIS) is designed to improve the sensitivity and spatial resolution of the Chandra X-ray Observatory. AXIS aims to deliver low-background, arcsecond imaging over a broad 0.3–10 keV energy range, featuring an effective area of 3600 cm$^2$ at 1 keV and 830 cm$^2$ at 6 keV across a 450 arcmin$^2$...
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Caleb Gemmell (University of Wisconsin Madison)02/12/2025, 16:00
Complex dark sectors are models where a 'sector' of new particles with intra-sector interactions are used to extend the Standard Model. Motivated by theoretical considerations such as the Hierarchy Problem, these models generically also provide dark matter candidates. In this talk I will discuss a range of complex dark sectors and how the properties of the gauge group can effect astrophysical...
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Mainak Mukhopadhyay (Fermilab)02/12/2025, 16:30
Active Galactic Nuclei (AGNs) are among the most powerful multi-messenger sources in the universe, emitting high-energy neutrinos and electromagnetic radiation. Recent observations from IceCube and complementary gamma-ray and X-ray telescopes aid in precise modeling of these extreme environments. In this talk, I will discuss how AGNs—natural sites of intense particle acceleration—can also...
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