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Our Universe in Simulation

Sede A. Riccò Via Santa Sofia 78, Catania

Ongoing and upcoming cosmological surveys—including the Simons Observatory, LiteBIRD, Rubin LSST, Euclid, DESI, PSF, SPHEREx, and the Roman Space Telescope—will deliver observations of unprecedented precision. Joint analyses across these surveys will be essential for uncovering fundamental physics, including the nature of inflation, dark energy, dark matter, neutrino mass, and more. In this talk, I will discuss the opportunities, challenges, and strategies for simulating our universe across multiple wavelengths to realize these goals.In this talk, I will discuss the motivations and objectives of the project, the published results, ongoing studies and the future developments.

Magnetic instabilities and angular momentum transport in red giant core

Sede A. Riccò Via Santa Sofia 78, Catania

The stability of magnetic fields in radiative stellar interiors remains a fundamental open question in understanding the rotational and chemical evolution of low-mass stars. Recent high-resolution asteroseismic observations of red giants have revealed unexpectedly slow core rotations and the presence of strong internal magnetic fields, opening a new window on the internal dynamics of evolved stars. In this talk, I will review the main magnetohydrodynamic instabilities expected in radiative stellar interiors and present new 3D direct numerical simulations of the Tayler instability, a kink-type instability of toroidal magnetic fields prevalent in these regions. By combining simulations, linear stability analysis, and stellar evolution models, we identify where and under what conditions the Tayler instability is likely to operate in red giant cores. These results provide new insight into angular momentum transport in evolved low-mass stars and may also have broader implications for other stars with radiative interiors.