Dr. Elise Novitski, University of Washington

Title: A new approach to measuring neutrino mass

Abstract: Of all the fundamental fermion masses, those of the neutrinos alone remain unmeasured. From their unknown origin to their effects on the evolution of the universe, neutrino masses are of interest across cosmology, nuclear physics, and particle physics. Neutrino oscillation experiments have set a non-zero lower limit on the mass scale, in contradiction to the original Standard Model prediction. To measure neutrino mass precisely and directly one must turn to beta decay and search for a telltale distortion in the spectrum. I will describe a new technique called Cyclotron Radiation Emission Spectroscopy (CRES), in which beta decay of tritium occurs in a magnetic field and each electron's ~1 fW of cyclotron radiation is directly detected. Electron energies are then determined via a relativistic relationship between energy and frequency. I will present the first CRES-based mass limits from the Project 8 experiment, which demonstrate the promise of this technique for surmounting the systematic and statistical barriers that currently limit the precision of direct neutrino mass measurements. I will also describe the next steps on the path to sensitivity to a mass of 40 meV/c^2, covering the entire inverted ordering of neutrino masses

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Title: Free boundary problems for Euler flows

Abstract: Free boundary problems are very interesting but also very challenging problems in fluid dynamics, where the boundary of the fluid is also freely moving along with the fluid flow. 

I will discuss two such models, governed by the compressible, respectively the incompressible Euler equations, including also MHD flows.  This is joint work with Mihaela Ifrim, and in part with Benjamin Pineau and Mitchell Taylor.

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Title: Final result from the Fermilab Muon g-2 Experiment

Abstract: On June 3, 2025, the Fermilab Muon g-2 Collaboration released its final determination for the muon's magnetic anomaly, a_μ = (g - 2)/2. Our result, after roughly a decade of design and construction and six years of data taking, was a_μ = 116 592 071(15)×10−11. The anomaly a_mu was determined from the ratio of the muon's anomalous precession frequency and the proton's Lamor precession frequency in the magnetic field of a 15 m diameter, 1.5 Tesla, superconducting muon storage ring. In this talk I'll discuss the science that motivated the  g-2 project and the techniques used to reach the 127-ppb precision. I'll also comment on the future work on the muon anomaly and the June 3, New York Times headline that the 'Muon Experiment was Hugely Successful but Clarifed Little'.

Title: Evidence for Missing Matter in the Inner Solar System: Does the Sun have a Dark Disk?

Abstract: The total mass and distribution of dark matter within the Solar system are poorly known, albeit constraints from measurements of planetary orbits exist. We have discovered, however, that different sorts of determinations of the Sun’s gravitational quadrupole moment can combine to yield new and highly sensitive constraints on the mass distribution close to the Sun. These outcomes provide evidence for a non-luminous disk in this region, nominally coplanar with Mercury’s orbit, and we develop how we can use this finding to limit its mass. The mass estimates associated with its known matter components, although uncertain, point to a prominent dark-matter contribution, which merits further investigation. We describe how existing spacecraft studies of the inner solar system support the existence of a circumsolar dust ring, and we note how continuing observational studies of the inner solar system, including the use of space-based quantum technology, can not only help to refine these constraints but also to identify the nature of and the mass of its dark-matter component.