Speaker
Valeria Ferrari
(Sapienza Rome)
Description
It is known that black holes have no hair, which means that they are fully described by only three parameters: mass, spin and charge. Conversely, a neutron star may have a very rich multipole structure, and all information about this structure is supposed to be radiated away during the gravitational collapse. However, the transition from a fully hairy star to a bald black hole may not be so sharp.
In recent years some relations among the moment of inertia, the quadrupole moment and the tidal deformability of neutron stars have been shown to exist, which are approximately independent of the equation of state. We will discuss the origin of these relations, which considerably reduce the number of parameters characterizing a neutron star, their range of validity, and provide examples of how they could be used.
Author
Valeria Ferrari
(Sapienza Rome)
