Speaker
Momchil Naydenov
(Sofia University "St. Kliment Ohridski")
Description
A phenomenological Lagrangian for the interaction between a pseudo-scalar (axion-like) field and massive fermions is constructed and its statistical properties are discussed. For a gas comprised of neutrons which interact with axions we compute the equation of state, where causality and thermal equilibrium are explored. Numerical solution of the Tolman-Oppenheimer-Volkoff equations present the influence of this additional interaction on the mass-radius dependence for static spherical stars. According to our model the presence of the hypothetical axion can contribute up to $3\%$ increase of a neutron star's mass. Observable properties of the system are considered within astrophysics and collider experiments.
Author
Momchil Naydenov
(Sofia University "St. Kliment Ohridski")
