Event Category: 4D Seminar

4D Seminar series:
Monday at 2:30 on campus

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The inherent noise in the intensity of light from astrophysical sources imprints correlations in photon arrival times, forming the very signal of intensity interferometry. Recent technological advances are reviving intensity interferometers as capable tools for high-precision astronomical measurements. I will propose a technique called the “expanding ejecta method” (EEM) to determine angular diameter distances to supernovae based purely on geometry, … Read More

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Abstract: Magnetic monopoles are well known to catalyze baryon number violating processes in grand unified theories through the Callan–Rubakov effect. More generally, however, monopoles participating in the electroweak anomaly can catalyze processes with ΔB=ΔL=3. In this talk, I will present a first phenomenological exploration of such monopole-induced processes in different physical settings. I will highlight the experimental signatures that arise … Read More

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Abstract: If we model the axion field quantum mechanically, how do the statistics of a continuous readout from a resonant detector change? In this talk, I demonstrate how to approach this question with the use of phase space representations, and show that the deviation from a classical treatment depends on both the DM state and the type of measurements being … Read More

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The Hyper Stealth Dark Matter model extends the Standard Model by a confining SU(ND) force to U(1) × SU(2) × SU(3) × SU(ND). The new sector equilibrates with the Standard Model only through electroweak interactions and without any mediator fields. The dark matter particle is the lightest SU(ND) baryon, is almost an electroweak singlet, and can have a surprising low … Read More

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With the advent of the James Webb Space Telescope (JWST), observational probes of the structure of objects in the early universe are more readily available. In particular, the discovery of high-redshift (z ∼ 10) Supermassive Black Holes (SMBHs) challenges the typical formation channels of these objects, which cannot form sufficiently massive seeds or grow them within these timescales without significant … Read More

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Abstract: Dark matter has been one of the central puzzles in physics for nearly a century, and after four decades of direct-detection experiments, with sensitivities improving by roughly ten orders of magnitude, we still have no definitive detection. As the search continues, along with all the efforts in improving detector technology, the progress also requires pushing in two complementary directions: … Read More

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Abstract: The gravitational path integral can compute inner products between different states of open and closed universes. To have a well-defined Hilbert space, these inner products should be positive semi-definite, which is not manifest in the low-energy effective theory. In this letter, we analyze the constraints that the positivity of inner products imposes on gravitational theories coupled to axions. If … Read More

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The origin of the electroweak scale remains one of the central open questions in particle physics. In this talk, I will present a framework based on the idea that the small Higgs mass reflects the proximity of the Higgs sector to a critical point in parameter space. In this framework, the hierarchy between the electroweak scale and the fundamental scale … Read More