Speaker: Dr. Sota Hanai (Academia Sinica)
Talk title: Chiral-Transport-Induced Collective Modes in Strong Magnetic Fields and Their Implications for Neutron Star Phenomenology
Time: 2026/10/05 (Mon.) 12:30
Place: NCTS Physics 4F Lecture Hall, Cosmology Hall, NTU

Abstract: 
Neutron stars are compact objects with extremely high densities and strong magnetic fields, and elucidating their internal structure remains an important problem spanning particle physics, nuclear physics, and astrophysics. In such a dense environment, relativistic fermions emerge, and their chirality is known to play an essential role in transport phenomena. One prototypical example is the chiral magnetic effect, in which an electric current is generated along the magnetic field. This effect also induces a density wave propagating along the magnetic field, known as the chiral magnetic wave.
In this talk, I will discuss gravitational and electromagnetic collective excitations induced by chiral transport phenomena in neutron stars. In the context of asteroseismology, seismic oscillations and the associated gravitational waves are classified into several modes according to their physical origin, such as p-, g-, and r-modes. In addition to these conventional modes, I will show that a new type of oscillation mode can appear in the color superconducting phase of neutron stars. I will then turn to the electromagnetic response of magnetized dense matter and demonstrate that the chiral anomaly gives rise to anomalous dynamical screening.