Field theory

Neutron Stars

A Neutron Star is an extremely compact star with a mass of 1-2 solar masses and a radius of only 10 - 20 km. In general, there is an upper limit for the mass of a Neutron Star. But a fast rotating Neutron Star can be heavier than a slow rotating one. Due to its rotation the Neutron Star is deformed, its circumference is larger at its equator. Additionally, the rotation causes a moment of inertia I and a so-called quadrupolmoment Q. Moreover, there are the Love numbers, which describe the deformability of a Neutron Star. Between the moments of inertia, the quadrupolmoments, and the Love numbers there are important relations. They are called: I-Love-Q.

If you are interested in a thesis in this or a similar area, contact Prof. Dr. Jutta KunzDr. Burkhard KleihausDr. Jose Luis Blazquez, or Dr. Saskia Grunau.

In the center of the crab nebula there is a pulsar which rotates 30 times per second. It is a Neutron Star as massiv as the Sun but with the size of a small city
(Image credit: NASA).