[Theory-seminars] Theory Seminar Monday (remote) - Peter Rau

[Zheng-Yang Li]

Dear all,

On Monday, April 28th, 2025 at 1:00PM EDT, we will have a virtual seminar given by Peter Rau of Columbia University on the following Zoom link:

https://jlab-org.zoomgov.com/j/1619687042?pwd=nazDiNhmbaexz8eV2eZ5XYH93A7uxa.1

Although it’s not an in-person seminar, you can also join your colleagues for a remote streaming of the seminar in CEBAF Center F326-327.

Please see below for the title and abstract.

Theory Seminar: April 28th, 1pm EDT (virtual)

Speaker: Peter Rau (Columbia University)

Title: Neutron stars under extreme magnetic fields and temperatures


Abstract: In addition to their astrophysical significance as the compact remnants of massive stars, neutron stars are excellent laboratories for studying extreme physics. I will discuss two aspects of this extreme physics. First, the most strongly-magnetized neutron stars possess magnetic fields which can confine electrons into a small to moderate number of quantized Landau levels. This can have a dramatic effect on their thermodynamic and transport properties. In a recent paper, we studied magnetic field evolution in neutron star crusts, including for the first time field-dependent de Haas--van Alphen oscillations of magnetization and magnetic susceptibility. I will explain how this mechanism could help explain why more strongly-magnetized neutron stars are observed to be hotter, which requires physics beyond standard Ohmic dissipation. I will then discuss neutron star stellar oscillation modes, which provide key insights into stellar composition and the dense matter equation of state. These oscillations are modified at high temperatures typical for newborn neutron stars and binary merger remnants, which violate the usual assumption of chemical equilibrium used to compute buoyancy-supported g-modes. We show that when weak interactions are consistently included in oscillation mode calculations, g-modes are suppressed above MeV-range temperatures. This could modify the expected gravitational wave spectrum produced by "warm" neutron stars.

See you on Monday.

Best regards,

Joe, Zheng-Yang, Gloria and Adam
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