Polar Quasinormal Modes of Neutron Stars in Massive Scalar-Tensor Theories

Understand

We study polar quasinormal modes of relativistic stars in scalar-tensor theories, where we include a massive gravitational scalar field and employ the standard Brans-Dicke coupling function.

• For the potential of the scalar field we consider a simple mass term as well as a potential associated with $R^2$ gravity.
• The presence of the scalar field makes the spectrum of quasinormal modes much richer than the spectrum in General Relativity.
• We here investigate radial modes ($l=0$) and quadrupole modes ($l=2$).