Preliminary results for measuring the electric dipole moment of the neutron using neutron star spin-down

The electric dipole moment (EDM) of the neutron provides a uniquely sensitive probe of time-reversal and CP violation beyond the Standard Model. While terrestrial EDM searches rely on ultracold neutrons and laboratory electric fields, rapidly rotating neutron stars offer an astrophysical laboratory where the extreme density and magnetic field conditions can amplify any intrinsic EDM effects. We present preliminary results from a new approach that constrains the neutron EDM through long-term timing observations of pulsars. A density model of pulsars with documented masses and radii is created to properly estimate the number of neutrons and investigate the magnetic field of the pulsar. Further, we model the stellar spin-down as a combination of energy loss mechanisms, including magnetic dipole radiation and gravitational-wave emission. Any energy loss unaccounted for in the neutron star spin-down can be used to set limits on the neutron electric dipole moment. While preliminary, this research suggests that neutron star spin evolution provides a powerful astrophysical complement to laboratory EDM searches.